Chocolate dogtooth calcite, large Picture jasper The calcite formed a chunky

The calcite formed a chunky druzy of icy colorless intersecting rhombohedral crystals that almost appear cubic in areas

Pits are a natural product of polishing

with platelet growth all around the base

Wulfenite from the Glove Mine commonly is also commonly a dark brown-black

Chalcedony is the cryptocrystalline version of quartz with similar requirements for growth

Chocolate dogtooth calcite, large Picture jasper The calcite formed a chunkyLocale: Santa Eulalia, Chihuahua, Mexico Approx size: 5. 5 x 3. 5 x 1. 75" Approx weight: 542g (a bit over 1 lb) Known by the trade name "chocolate dogtooth calcite," this type of calcite from the famed Santa Eulalia mining district grows in hedgehog clusters of sharp dogtooth (scalenohedral) crystals. The variety gets its distinctive opaque brown appearance from iron oxides; a layer of hematite included calcite is deposited on the surface during a