Here you can find eight kinds of different minerals, each kind contain three meshes. All models textured for PBR, also all materials use special shader which provide extra effects for kristalls. (!Scetchfab preview in store don't represent shader feature!)
Triangles count (for each three meshes):
Mineral 6 - 3000 tris
Mineral 7 - 3100 tris
Mineral 8 - 3400 tris
Mineral 9 - 9300 tris
Mineral 10 - 1850 tris
Mineral 11 - 2730 tris
Mineral 12 - 7960 tris
Mineral 12 - 6900 tris