Chocolate dogtooth calcite, large Ferruginous quartz in the case of Option

in the case of Option F

They have a yellowish coloration under the surface with some transparency

and produces long barrel-shaped hexagonal crystals

brittle crust which may make them susceptible to fracturing as part of normal geological processes

Chocolate dogtooth calcite, large Ferruginous quartz in the case of OptionLocale: Santa Eulalia, Chihuahua, Mexico Approx size: 3. 75 x 2. 25 x 2. 25" Approx weight: 485g (about 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 later