diff --git a/examples/example_material.xomp b/examples/example_material.xomp
index 6d8d91b5..97712223 100644
--- a/examples/example_material.xomp
+++ b/examples/example_material.xomp
@@ -15,6 +15,15 @@
         "surface_height_rms": 0.8,
         "surface_correlation_length": 1.0
     },
+    "elasticity_data": {
+        "youngs_modulus": 70e9,
+        "poissons_ratio": 0.35,
+        "source": "internet: https://en.wikipedia.org/wiki/Aluminium"
+    },
+    "density_data": {
+        "density": 2699.0,
+        "source": "internet: https://en.wikipedia.org/wiki/Aluminium"
+    },
     "electromagnetic_properties_uri": "example_material_emp.xompt"
   }
 }
diff --git a/schemas/material_schema.json b/schemas/material_schema.json
index 6950f870..b25f967d 100644
--- a/schemas/material_schema.json
+++ b/schemas/material_schema.json
@@ -82,6 +82,47 @@
             "surface_correlation_length"
           ]
         },
+        "elasticity_data": {
+          "type": "object",
+          "description": "Information about the elasticity of the material.",
+          "properties": {
+            "youngs_modulus": {
+              "type": "number",
+              "description": "Young's modulus of the material in Pa."
+            },
+            "poissons_ratio": {
+              "type": "number",
+              "description": "Poisson's ratio of the material."
+            },
+            "source": {
+              "type": "string",
+              "description": "Source of the elasticity data."
+            }
+          },
+          "required": [
+            "youngs_modulus",
+            "poissons_ratio",
+            "source"
+          ]
+        },
+        "density_data": {
+          "type": "object",
+          "description": "Information about the density of the material.",
+          "properties": {
+            "density": {
+              "type": "number",
+              "description": "Density of the material in kg/m^3."
+            },
+            "source": {
+              "type": "string",
+              "description": "Source of the density data."
+            }
+          },
+          "required": [
+            "density",
+            "source"
+          ]
+        },
         "electromagnetic_properties_uri": {
           "type": "string",
           "description": "Relative path to a property lookup table file with electromagnetic material properties.",
@@ -90,6 +131,8 @@
       },
       "required": [
         "surface_roughness",
+        "elasticity_data",
+        "density_data",
         "electromagnetic_properties_uri"
       ]
     }