diff --git a/addons/io_scene_gltf2/blender/com/gltf2_blender_conversion.py b/addons/io_scene_gltf2/blender/com/gltf2_blender_conversion.py
index bb49cc7f9..d52526777 100644
--- a/addons/io_scene_gltf2/blender/com/gltf2_blender_conversion.py
+++ b/addons/io_scene_gltf2/blender/com/gltf2_blender_conversion.py
@@ -99,6 +99,8 @@ def get_component_type(attribute_component_type):
         "FLOAT_COLOR": gltf2_io_constants.ComponentType.Float,
         "FLOAT_VECTOR": gltf2_io_constants.ComponentType.Float,
         "FLOAT_VECTOR_4": gltf2_io_constants.ComponentType.Float,
+        "QUATERNION": gltf2_io_constants.ComponentType.Float,
+        "FLOAT4X4": gltf2_io_constants.ComponentType.Float,
         "INT": gltf2_io_constants.ComponentType.Float, # No signed Int in glTF accessor
         "FLOAT": gltf2_io_constants.ComponentType.Float,
         "BOOLEAN": gltf2_io_constants.ComponentType.Float,
@@ -120,6 +122,8 @@ def get_data_type(attribute_component_type):
         "FLOAT_COLOR": gltf2_io_constants.DataType.Vec4,
         "FLOAT_VECTOR": gltf2_io_constants.DataType.Vec3,
         "FLOAT_VECTOR_4": gltf2_io_constants.DataType.Vec4,
+        "QUATERNION": gltf2_io_constants.DataType.Vec4,
+        "FLOAT4X4": gltf2_io_constants.DataType.Mat4,
         "INT": gltf2_io_constants.DataType.Scalar,
         "FLOAT": gltf2_io_constants.DataType.Scalar,
         "BOOLEAN": gltf2_io_constants.DataType.Scalar,
@@ -133,6 +137,8 @@ def get_data_length(attribute_component_type):
         "FLOAT_COLOR": 4,
         "FLOAT_VECTOR": 3,
         "FLOAT_VECTOR_4": 4,
+        "QUATERNION": 4,
+        "FLOAT4X4": 16,
         "INT": 1,
         "FLOAT": 1,
         "BOOLEAN": 1
@@ -146,6 +152,8 @@ def get_numpy_type(attribute_component_type):
         "FLOAT_COLOR": np.float32,
         "FLOAT_VECTOR": np.float32,
         "FLOAT_VECTOR_4": np.float32,
+        "QUATERNION": np.float32,
+        "FLOAT4X4": np.float32,
         "INT": np.float32, #signed integer are not supported by glTF
         "FLOAT": np.float32,
         "BOOLEAN": np.float32,
@@ -172,6 +180,10 @@ def get_attribute_type(component_type, data_type):
             gltf2_io_constants.ComponentType.UnsignedShort: "BYTE_COLOR",
             gltf2_io_constants.ComponentType.UnsignedByte: "BYTE_COLOR" # What is the best for compatibility?
         }.get(component_type, None)
+    elif gltf2_io_constants.DataType.num_elements(data_type) == 16:
+        return {
+            gltf2_io_constants.ComponentType.Float: "FLOAT4X4"
+        }.get(component_type, None)
     else:
         pass
 
diff --git a/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_primitives_extract.py b/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_primitives_extract.py
index 84d8454ad..d2241457b 100644
--- a/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_primitives_extract.py
+++ b/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_primitives_extract.py
@@ -1283,6 +1283,12 @@ def __get_layer_attribute(self, attr):
         elif attr['blender_data_type'] == "FLOAT_VECTOR":
             self.blender_mesh.attributes[attr['blender_attribute_index']].data.foreach_get('vector', data)
             data = data.reshape(-1, attr['len'])
+        elif attr['blender_data_type'] == "QUATERNION":
+            self.blender_mesh.attributes[attr['blender_attribute_index']].data.foreach_get('value', data)
+            data = data.reshape(-1, attr['len'])
+        elif attr['blender_data_type'] == "FLOAT4X4":
+            self.blender_mesh.attributes[attr['blender_attribute_index']].data.foreach_get('value', data)
+            data = data.reshape(-1, attr['len'])
         elif attr['blender_data_type'] == "FLOAT_VECTOR_4": # Specific case for tangent
             pass
         elif attr['blender_data_type'] == "INT":