Dog Teeth Calcite (Drusy) on metal stand from Bantan, Indonesia.

Dogtooth calcite is a variety of calcite that forms as multiple scalenohedral crystals. Dogtooth Calcite is often called Dog-toothed Spar. (Fir is a general term for transparent to translucent, generally light-colored and glassy crystalline minerals.) Dogtooth Calcite is an unusual variety of calcite and is called "Dogtooth" because the stone itself looks like a large collection of dog teeth. It has a number of standard colors from clear to gold, white, gray, brown, brown and purple to name a few, but there are also some rarer shades. Dogtooth calcite is often found in caves as a speleothem growing from limestone. These caves often have standing water that is seasonal or undisturbed for many years, allowing these unique formations to grow. Dogtooth calcite crystals are not limited to caves, but can grow in any open space, including veins, fractures and geodes. The sharply toothed crystals typically consist of acute scalenohedrons, triangular crystal faces that ideally form scalene triangles. (In a scalene triangle, all sides and all angles are unequal. An example is a right triangle, but scalene triangles are not always right triangles.) However, modification of these faces is common, and individual crystal faces can have many more than three. edges. Our favorite Dogtooth Calcite specimens come from the mines in the Santa Eulalia District, Chihuahua, Mexico. The stunning browns, browns, purples and "snow coatings" are fascinating