diff --git a/doc/materials/groups/MATGROUP_STONE b/doc/materials/groups/MATGROUP_STONE
new file mode 100644
index 0000000..7a76e5c
--- /dev/null
+++ b/doc/materials/groups/MATGROUP_STONE
@@ -0,0 +1,5 @@
+Gruppenid:
+MATGROUP_STONE
+
+Name:
+Steine