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Cave calcite from Morocco, also known as Aragonite, is a mineral formation found in underground caves. It's characterized by unique, often botryoidal (globular or grape-like) shapes and can fluoresce under UV light. While often called cave calcite, it's actually a form of aragonite, which shares the same chemical formula (CaCO3) as calcite but has a different crystal structure, according to Fossil Era. This cave calcite specimen is UV reactive and very heavy. This beautiful, thick cluster weighs 1 pound 12 ounces, is around 6" wide, 3" tall, and 5" deep. Dogtooth Calcite is a variety of Calcite that forms as multiple scalenohedral crystals. Dogtooth Calcite is often referred to as Dog-toothed Spar. It consists of large calcite crystals thought to resemble dogs' teeth due to the 'pointed' crystal habit. Dolomite forms white, pink or tan crystals. It is formed in hydrothermal veins and frequently in cavities of limestone and marble.