cube with rough octahedron faces
Marcasite agate is a variety of chalcedony (or agate) that features metallic
Calcite altered to hematite and filled in the interior with quartz
Genuine Madagascar ammonite fossil — not a replica
In addition to the unique and all natural calcite inclusion
11 x 14 Vintage Mineral Print - Feldspar inc. Amazonite south africa mineral cube with rough octahedron facesVintage image from the early 1900s reproduced on uncoated classic matte paper. This lovely public domain image may be just what is needed to dress up your office, basement, rock collection or rock shop. This artwork features the following: 1. Adularia (orthoclase), large, simple (i. e . untwinned) crystal 2. Adularia, group of crystals, small faces are coated with chlorite 3. Adularia, Manebach twin 4. Sanidine (orthoclase), from trachyte. 5. Albite,