diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3089a6e318cfd54b7d1562e1839795f0f55698b6..1d704277d3b9bd6c27639807c57e8f4e2e86c544 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -72,6 +72,7 @@ add_library(DetectorLib SHARED
     Core/src/LHCbCompactTags.cpp
     Core/src/ShapeUtilities.cpp
     Core/src/Utils.cpp
+    Core/src/MaterialHelper.cpp
     Detector/Calo/src/DeCaloHandles.cpp
     Detector/Calo/src/DeCalorimeter.cpp
     Detector/FT/src/DeFT.cpp
diff --git a/Core/include/Core/Material.h b/Core/include/Core/Material.h
index 58e80c5a159ad2075f2f5bbea02ad084f08315c8..9cf783b1f85101a1d4221688b857195e4142d052 100644
--- a/Core/include/Core/Material.h
+++ b/Core/include/Core/Material.h
@@ -12,10 +12,9 @@
 
 #include <Core/DeIOV.h>
 
+#include <TGeoMaterial.h>
 #include <TGeoMedium.h>
 
-using LHCb::Detector::NotImplemented;
-
 namespace LHCb::Detector {
 
   /**
@@ -31,15 +30,32 @@ namespace LHCb::Detector {
     /// Material radiation length [cm]
     double radiationLength() const { return radLength(); };
 
-    /// Mean excitiation energy
-    double I() const { throw NotImplemented(); }
+    double I() const { return getMaterialProperty( "I" ); }
+
+    double C() const { return getMaterialProperty( "C" ); }
+
+    double a() const { return getMaterialProperty( "a" ); }
+
+    double m() const { return getMaterialProperty( "m" ); }
+
+    double X1() const { return getMaterialProperty( "X1" ); }
+
+    double X0() const { return getMaterialProperty( "X0" ); }
 
-    /// Parameters for density effect correction
-    double C() const { throw NotImplemented(); }
-    double a() const { throw NotImplemented(); }
-    double m() const { throw NotImplemented(); }
-    double X1() const { throw NotImplemented(); }
-    double X0() const { throw NotImplemented(); }
+  private:
+    double getMaterialProperty( const std::string& propertyName ) const {
+      TGeoMedium* geoMedium = this->ptr();
+      if ( geoMedium ) {
+        TGeoMaterial* rootMaterial = geoMedium->GetMaterial();
+        if ( rootMaterial ) {
+          return rootMaterial->GetConstProperty( propertyName.c_str() );
+        } else {
+          throw std::runtime_error( "Property '" + propertyName + "' is not available in this material" );
+        }
+      } else {
+        throw std::runtime_error( "TGeoMedium is not available" );
+      }
+    }
   };
 
 } // namespace LHCb::Detector
diff --git a/Core/include/Core/MaterialHelper.h b/Core/include/Core/MaterialHelper.h
new file mode 100644
index 0000000000000000000000000000000000000000..cb279b8dfb691c691be5ab4e4be3302ed6fc292c
--- /dev/null
+++ b/Core/include/Core/MaterialHelper.h
@@ -0,0 +1,20 @@
+/*****************************************************************************\
+* (c) Copyright 2003 CERN for the benefit of the LHCb Collaboration      *
+*                                                                             *
+* This software is distributed under the terms of the GNU General Public      *
+* Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING".   *
+*                                                                             *
+* In applying this licence, CERN does not waive the privileges and immunities *
+* granted to it by virtue of its status as an Intergovernmental Organization  *
+* or submit itself to any jurisdiction.                                       *
+\*****************************************************************************/
+#pragma once
+
+#include <TGeoMaterial.h>
+#include <TGeoManager.h>
+
+namespace LHCb::Detector {
+
+    void compute_extra_material_properties(TGeoMaterial *material, TGeoManager *manager);
+
+} // namespace LHCb::Detector
diff --git a/Core/src/DetectorDataService.cpp b/Core/src/DetectorDataService.cpp
index 7b1ad9caf644f10d2d1bb8f6d9049eea6875038b..951d54c56af1bcd6193544758b4caf05aa487c2d 100644
--- a/Core/src/DetectorDataService.cpp
+++ b/Core/src/DetectorDataService.cpp
@@ -13,6 +13,7 @@
 #include <Core/CondDBSchema.h>
 #include <Core/DetectorDataService.h>
 #include <Core/DetectorOptions.h>
+#include <Core/MaterialHelper.h>
 #include <DD4hep/ConditionDerived.h>
 #include <DD4hep/DetFactoryHelper.h>
 #include <DD4hep/InstanceCount.h>
@@ -169,6 +170,13 @@ void LHCb::Detector::DetectorDataService::initialize( const nlohmann::json& conf
     }
   }
 
+  TList*       materials = m_description.manager().GetListOfMaterials();
+  TGeoManager& manager   = m_description.manager();
+  for ( TObject* o : *materials ) {
+    TGeoMaterial* mat = dynamic_cast<TGeoMaterial*>( o );
+    LHCb::Detector::compute_extra_material_properties( mat, &manager );
+  }
+
   if ( loader["UseOverlay"].value<bool>() ) {
     // I do not like it, but I do not see other ways of jumping through the plugin barrier
     // imposed by the ConditionsManager.
diff --git a/Core/src/MaterialHelper.cpp b/Core/src/MaterialHelper.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..144b71ade687c4068e3eab8fbfb3ac53117135d2
--- /dev/null
+++ b/Core/src/MaterialHelper.cpp
@@ -0,0 +1,248 @@
+/*****************************************************************************\
+* (c) Copyright 2023 CERN for the benefit of the LHCb Collaboration           *
+*                                                                             *
+* This software is distributed under the terms of the GNU General Public      *
+* Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING".   *
+*                                                                             *
+* In applying this licence, CERN does not waive the privileges and immunities *
+* granted to it by virtue of its status as an Intergovernmental Organization  *
+* or submit itself to any jurisdiction.                                       *
+\*****************************************************************************/
+#include <Core/MaterialHelper.h>
+#include <Core/Units.h>
+
+#include <TGeoManager.h>
+#include <TGeoMaterial.h>
+
+#include <iostream>
+#include <unordered_map>
+
+using LHCb::Detector::detail::DD4hepToLHCbEnergy;
+
+void LHCb::Detector::compute_extra_material_properties( TGeoMaterial* material, TGeoManager* manager ) {
+
+  int nelements = material->GetNelements();
+
+  double mat_A  = 0;
+  double mat_Z  = 0;
+  double mat_I  = 0;
+  double mat_C  = 0;
+  double mat_X0 = 0;
+  double mat_X1 = 0;
+  double mat_a  = 0;
+  double mat_m  = 0;
+
+  static constexpr double eV = dd4hep::eV * DD4hepToLHCbEnergy;
+
+  // Taken from DetDesc which should be using the following paper referenced in Geant 4 [1]:
+  //
+  // M.J. Berger et al. Icru report 37. Journal of the International Commission on Radiation Units and Measurements,
+  // os19(2):, dec 1984. URL: https://doi.org/10.1093/jicru/os19.2.Report37, doi:10.1093/jicru/os19.2.report37.
+  //
+  // * many I_eff values can be approximated using simplified formula,
+  //   prefer using the values from the paper directly
+  static std::map<int, double> Ieff_map = {
+      {1, 19.2},
+      {2, 41.8},
+      {3, 40.0},
+      {4, 63.7},
+      {5, 76.0},
+      {6, 78.0},
+      {7, 82.0},
+      {8, 117.689},
+      {9, 115.0},
+      {10, 137.0},
+      {11, 149.0},
+      {12, 156.0},
+      {13, 166.0},
+      {14, 173.0},
+      {15, 173.0},
+      {16, 180.0},
+      {17, 174.0},
+      {18, 188.0},
+      {19, 190.0},
+      {20, 191.0},
+      {21, 216.0},
+      {22, 233.0},
+      {23, 245.0},
+      {24, 257.0},
+      {25, 272.0},
+      {26, 286.0},
+      {27, 297.0},
+      {28, 311.0},
+      {29, 322.0},
+      {30, 330.0},
+      {31, 334.0},
+      {32, 352.0},
+      {33, 347.0},
+      {34, 348.0},
+      {35, 347.0},
+      {36, 352.0},
+      {37, 363.0},
+      {38, 366.0},
+      {39, 379.0},
+      {40, 487.0},
+      {41, 417.0},
+      {42, 425.0},
+      {43, 428.0},
+      {44, 441.0},
+      {45, 449.0},
+      {46, 470.0},
+      {47, 470.0},
+      {48, 469.0},
+      {49, 487.0},
+      {50, 488.0},
+      {51, 619.0},
+      {52, 485.0},
+      {53, 491.0},
+      {54, 482.0},
+      {55, 667.0},
+      {56, 491.0},
+      {57, 501.0},
+      {58, 523.0},
+      {59, 535.0},
+      {60, 546.0},
+      {61, 560.0},
+      {62, 574.0},
+      {63, 580.0},
+      {64, 591.0},
+      {65, 614.0},
+      {66, 628.0},
+      {67, 650.0},
+      {68, 658.0},
+      {69, 674.0},
+      {70, 684.0},
+      {71, 694.0},
+      {72, 705.0},
+      {73, 718.0},
+      {74, 727.0},
+      {75, 736.0},
+      {76, 746.0},
+      {77, 757.0},
+      {78, 790.0},
+      {79, 790.0},
+      {80, 800.0},
+      {81, 810.0},
+      {82, 823.0},
+      {83, 823.0},
+      {84, 830.0},
+      {85, 825.0},
+      {86, 794.0},
+      {87, 827.0},
+      {88, 826.0},
+      {89, 841.0},
+      {90, 847.0},
+      {91, 878.0},
+      {92, 890.0},
+      {93, 902.0},
+      {94, 921.0},
+      {95, 934.0},
+      {96, 939.0},
+      {97, 952.0},
+      {98, 966.0}
+  };
+
+  // Differences between Geant and DetDesc:
+  // Element 1  (Hydrogen)   : G4: 19.2                DetDesc: 20        (average between gas and liquid)
+  // Element 5  (Boron)      : G4: 76.0                DetDesc: 92.1085  - bug in DetDesc?
+  // Element 7  (Nitrogen)   : G4: 82.0   gas          DetDesc: 108.946  - bug in DetDesc?
+  // Element 9  (Fluorine)   : G4: 115.0  gas          DetDesc: 126.572  - bug in DetDesc?
+  // Element 11 (Sodium)     : G4: 149.0               DetDesc: 149.7    - small difference
+  // Element 15 (Phosphorus) : G4: 173.0               DetDesc: 187      - bug in DetDesc?
+  // Element 16 (Sulfur)     : G4: 180.0               DetDesc: 199      - bug in DetDesc?
+  // Element 17 (Chlorine)   : G4: 174.0  gas          DetDesc: 211      - bug in DetDesc?
+  // Element 24 (Chromium)   : G4: 257.0               DetDesc: 295      - bug in DetDesc?
+  // Element 53 (Iodine)     : G4: 491.0  condensed    DetDesc: 474       (gas value taken)
+
+  for ( int i = 0; i < nelements; i++ ) {
+    TGeoElement* element = material->GetElement( i );
+    Double_t     z, a, w;
+    material->GetElementProp( a, z, w, i );
+
+    if ( z <= 0 ) { throw std::runtime_error( std::string( element->GetName() ) + " : Z must be greater than 0" ); }
+
+    double I_eff = [&]() -> double {
+      auto it = Ieff_map.find( int( z ) );
+      if ( it != Ieff_map.end() ) {
+        return it->second * eV;
+      } else {
+        throw std::runtime_error( std::string( element->GetName() ) + " : I_eff not found" );
+      }
+    }();
+
+    mat_A += w * a;
+    mat_Z += w * z;
+    mat_I += w * z * std::log( I_eff );
+  }
+
+  mat_I = std::exp( mat_I / mat_Z );
+
+  const double mat_density = material->GetDensity();
+  if ( mat_density <= 0 || mat_A <= 0 ) {
+    throw std::runtime_error( std::string( material->GetName() ) + " : Zero or negative density or A" );
+  }
+
+  const double factor = 28.816; // sqrt( 4*pi * re * NA ) * hbar c
+  const double plasma = factor * std::sqrt( mat_density * mat_Z / mat_A ) * dd4hep::eV * DD4hepToLHCbEnergy;
+
+  mat_C            = 1 + 2 * std::log( mat_I / plasma );
+  const double x_a = mat_C / 4.606;
+
+  auto state = material->GetState();
+
+  if (state != TGeoMaterial::EGeoMaterialState::kMatStateGas) {
+    // correct only for condensed materials
+    if (mat_I < (100. * eV)) {
+        if (mat_C > 3.681) {
+            mat_X0 = 0.326 * mat_C - 1.0;
+            mat_X1 = 2;
+        } else {
+            mat_X0 = 0.2;
+            mat_X1 = 2;
+        }
+    } else {
+        if (mat_C > 5.215) {
+            mat_X0 = 0.326 * mat_C - 1.5;
+            mat_X1 = 3;
+        } else {
+            mat_X0 = 0.2;
+            mat_X1 = 3;
+        }
+    }
+  } else { // not implemented in DetDesc
+    if (mat_C < 10.) {
+        mat_X0 = 1.6;
+        mat_X1 = 4.;
+    } else if (mat_C < 10.5) {
+        mat_X0 = 1.7;
+        mat_X1 = 4.;
+    } else if (mat_C < 11.) {
+        mat_X0 = 1.8;
+        mat_X1 = 4.;
+    } else if (mat_C < 11.5) {
+        mat_X0 = 1.9;
+        mat_X1 = 4.;
+    } else if (mat_C < 12.25) {
+        mat_X0 = 2.;
+        mat_X1 = 4.;
+    } else if (mat_C < 13.804){
+        mat_X0 = 2.;
+        mat_X1 = 5.;
+    } else {
+        mat_X0 = 0.326 * mat_C - 2.5;
+        mat_X1 = 5.;
+    }
+  }
+
+  mat_a = 4.606 * ( x_a - mat_X0 ) / std::pow( mat_X1 - mat_X0, 3 ); // this is pow( ..., mat_m), is mat_m needed?
+  mat_m = 3.0;
+
+  std::unordered_map<std::string, double> mat_properties = {{"I", mat_I}, {"X0", mat_X0}, {"X1", mat_X1},
+                                                            {"C", mat_C}, {"a", mat_a},   {"m", mat_m}};
+
+  for ( auto& prop : mat_properties ) {
+    TString propname = TString{prop.first + "_"} + material->GetName();
+    manager->AddProperty( propname, prop.second );
+    material->AddConstProperty( TString{prop.first}, propname );
+  }
+}
diff --git a/Core/tests/CMakeLists.txt b/Core/tests/CMakeLists.txt
index d9e5b2d0567763fd55408a0af7725998c1475712..1f7d5a6c44cb62b49d5227d1d6ab42abb14972b3 100644
--- a/Core/tests/CMakeLists.txt
+++ b/Core/tests/CMakeLists.txt
@@ -55,6 +55,33 @@ catch_discover_tests(test_DDS
         LABELS "Detector.Core"
 )
 
+add_executable(test_Materials_properties
+    src/test_Materials_properties.cpp
+)
+target_link_libraries(test_Materials_properties
+    Catch2::Catch2WithMain
+    DetectorLib
+    GitCondDB::GitCondDB
+    TestUtils
+    yaml-cpp
+    ${TBB_lib}
+)
+
+# FIXME: this is too specific to the way lcg-toolchains and Gaudi projects work
+set_target_properties(test_Materials_properties PROPERTIES CROSSCOMPILING_EMULATOR ${PROJECT_BINARY_DIR}/bin/run)
+# This is to ensure that we have everything we need if we want to build and run only test_Materials_properties
+add_dependencies(test_Materials_properties DetectorPlugins)
+
+catch_discover_tests(test_Materials_properties
+    TEST_PREFIX Detector.Core.
+    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+    PROPERTIES
+        LABELS "Detector"
+        LABELS "Detector.Core"
+)
+
+
+
 # install the test wrapper script
 install(FILES scripts/runTest.sh DESTINATION ${CMAKE_BINARY_DIR}/bin/
   PERMISSIONS OWNER_WRITE OWNER_READ OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
diff --git a/Core/tests/src/test_Materials_properties.cpp b/Core/tests/src/test_Materials_properties.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f5cececf5a0a8ebc01c822cda27a2e439ea8c93e
--- /dev/null
+++ b/Core/tests/src/test_Materials_properties.cpp
@@ -0,0 +1,111 @@
+/*****************************************************************************\
+* (c) Copyright 2022 CERN for the benefit of the LHCb Collaboration           *
+*                                                                             *
+* This software is distributed under the terms of the GNU General Public      *
+* Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING".   *
+*                                                                             *
+* In applying this licence, CERN does not waive the privileges and immunities *
+* granted to it by virtue of its status as an Intergovernmental Organization  *
+* or submit itself to any jurisdiction.                                       *
+\*****************************************************************************/
+#include <Core/Keys.h>
+#include <Core/MaterialHelper.h>
+#include <DD4hep/Detector.h>
+#include <Detector/Test/Fixture.h>
+#include <Detector/VP/DeVP.h>
+#include <cstdio>
+
+#include <TGeoExtension.h>
+#include <TGeoManager.h>
+#include <TMap.h>
+
+#include <catch2/catch.hpp>
+#include <nlohmann/json.hpp>
+
+// Local utilities to load the DetDesc materials from
+// a JSON file and retrieve material properties
+namespace {
+  nlohmann::json load_detdesc_materials() {
+    std::string   filepath = "tests/materials/materials.json";
+    std::ifstream fileStream( filepath );
+    if ( !fileStream.is_open() ) { throw std::runtime_error( "Could not open file: " + filepath ); }
+    return nlohmann::json::parse( fileStream );
+  }
+
+  class missing_material : public std::runtime_error {
+    using std::runtime_error::runtime_error;
+  };
+
+  double get_detsdesc_property_value( nlohmann::json json, std::string material_name, std::string property_name ) {
+    for ( const auto& item : json ) {
+      std::string name = item["name"].get<std::string>();
+      if ( name == material_name ) { return item[property_name].get<double>(); }
+    }
+    throw missing_material( "Could not find material" + material_name + " in DetDesc" );
+  }
+} // namespace
+
+TEST_CASE( "MaterialProperties" ) {
+  namespace fs = std::filesystem;
+
+  Detector::Test::Fixture f;
+
+  auto& description = f.description();
+
+  // description.fromXML( "compact/run3/trunk/debug/VP_debug.xml" );
+  description.fromXML( "compact/run3/trunk/LHCb.xml" );
+
+  REQUIRE( description.state() == dd4hep::Detector::READY );
+
+  auto det = description.detector( "VP" );
+  // the `!!` is needed because handles have `operator!` but not `operator bool`
+  REQUIRE( !!det );
+
+  // We add the extra material properties to the materials
+  TList*       materials = description.manager().GetListOfMaterials();
+  TGeoManager& manager   = description.manager();
+  for ( TObject* o : *materials ) {
+    TGeoMaterial* mat = dynamic_cast<TGeoMaterial*>( o );
+    LHCb::Detector::compute_extra_material_properties( mat, &manager );
+  }
+
+  // Loading the JSON with DetDesc material properties
+  nlohmann::json json = load_detdesc_materials();
+
+  // List the materials and check the custom properties
+  TList*                                           materials2 = description.manager().GetListOfMaterials();
+  std::array<std::string, 6>                       properties_to_check{"X0", "X1", "a", "m", "C", "I"};
+  std::vector<std::string>                         missing;
+  std::vector<std::pair<std::string, std::string>> errors;
+  int                                              test_count = 0;
+  for ( TObject* o : *materials2 ) {
+    TGeoMaterial* m = dynamic_cast<TGeoMaterial*>( o );
+    try {
+      bool material_is_ok = true;
+      std::ostringstream oss;
+      for ( auto p : properties_to_check ) {
+        double      detdesc_v = get_detsdesc_property_value( json, m->GetName(), p );
+        double      dd4hep_v  = m->GetConstProperty( p.c_str() );
+        std::string prefix    = "MaterialCheck OK    ";
+        test_count++;
+        if ( ( std::abs( dd4hep_v - detdesc_v ) / detdesc_v ) > 1e-3 ) {
+          material_is_ok = false;
+          prefix = "MaterialCheck ERROR ";
+          errors.push_back( {m->GetName(), p} );
+        }
+        oss << prefix << ": " << m->GetName() << " " << p << " " << detdesc_v << "|" << dd4hep_v << "\n";
+      }
+      if( ! material_is_ok ) std::cout << oss.str();
+
+    } catch ( missing_material& ) {
+      missing.push_back( m->GetName() );
+      std::cout << "MaterialCheck MISSING Could not find material " << m->GetName() << " in DetDesc" << '\n';
+    }
+  }
+
+  // Now validating the results
+  std::cout << "MaterialCheck SUMMARY\n";
+  std::cout << "Missing    :" << missing.size() << " missing materials from DetDesc JSON export\n";
+  std::cout << "Error count: " << errors.size() << "/" << test_count << "\n";
+  CHECK( errors.size() == 0 );
+}
diff --git a/tests/materials/materials.json b/tests/materials/materials.json
new file mode 100644
index 0000000000000000000000000000000000000000..fd330ab6904d317096d68937ead94e5af37fa2f9
--- /dev/null
+++ b/tests/materials/materials.json
@@ -0,0 +1,2872 @@
+[
+    {
+        "A": 6.241506363094027e+22,
+        "C": 0.0,
+        "DensityFactor": 0.035930699999999996,
+        "I": 0.0,
+        "LogI": null,
+        "X0": 0.0,
+        "X1": 0.0,
+        "Z": 5.0,
+        "a": 0.0,
+        "density": 1.4605124889640022e+19,
+        "m": 0.0,
+        "name": "Bor_10"
+    },
+    {
+        "A": 6.8656569994034295e+22,
+        "C": 0.0,
+        "DensityFactor": 0.03266427272727273,
+        "I": 0.0,
+        "LogI": null,
+        "X0": 0.0,
+        "X1": 0.0,
+        "Z": 5.0,
+        "a": 0.0,
+        "density": 1.4605124889640022e+19,
+        "m": 0.0,
+        "name": "Bor_11"
+    },
+    {
+        "A": 6.74082687214155e+22,
+        "C": 3.2440299224306557,
+        "DensityFactor": 0.03326916666666666,
+        "I": 9.210848834780847e-05,
+        "LogI": -9.292543454478578,
+        "X0": 0.2,
+        "X1": 2.0,
+        "Z": 5.0,
+        "a": 0.3982904530916761,
+        "density": 1.4605124889640022e+19,
+        "m": 3.0,
+        "name": "Boron"
+    },
+    {
+        "A": 9.985786030314135e+22,
+        "C": 11.057389384085472,
+        "DensityFactor": 2.195902243890243e-05,
+        "I": 0.00011768866715985129,
+        "LogI": -9.047467834146468,
+        "X0": 2.104708939211864,
+        "X1": 3.0,
+        "Z": 8.0,
+        "a": 1.8994810987673276,
+        "density": 8.925354099224459e+15,
+        "m": 3.0,
+        "name": "Oxygen"
+    },
+    {
+        "A": 8.744350414694732e+22,
+        "C": 11.038324013705164,
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diff --git a/tests/materials/materials_original.json b/tests/materials/materials_original.json
new file mode 100644
index 0000000000000000000000000000000000000000..0ab70f806dee71a8e7dfda7ddf610f9f6a38c3b1
--- /dev/null
+++ b/tests/materials/materials_original.json
@@ -0,0 +1,2676 @@
+[
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