Vaterite (CaCO₃) is a mineral and polymorph of aragonite and calcite. It was named after the German mineralogist Heinrich Vater. It is also known as mu-calcium carbonate (μ-CaCO₃) and has a JCPDS number of 13-192. Unlike the other calcium carbonate polymorphs, calcite and aragonite, vaterite is thought to be a metastable phase and has higher solubility than the other forms of calcium carbonate. Therefore, once vaterite is exposed to water, it converts to calcite (at low temperature) or aragonite (at high temperature: ~60°C). However, vaterite does occur naturally in mineral springs, organic tissue, gallstones, and urinary calculi. In those circumstances, some impurities (metal ions or organic matter) may stabilize the vaterite and prevent its transformation into calcite or aragonite. The color of vaterite is usually white, its shape is spherical, and its diameter is small, ranging from 0.05 to 5 μm. In general, a polymorph is something that can exist in several states or forms. ... Aragonite Aragonite is a polymorph of the mineral calcite, both having the chemical composition CaCO3. ... Doubly refracting Calcite from Iceberg claim, Dixon, New Mexico. ... The Joint Committee for Powder Diffraction Studies (JCPDS) maintains a database of diffraction patterns, the Powder Diffraction File (PDF), including the d-spacings (related to angle of diffraction) and relative intensities of observable diffraction peaks. ... Calcium carbonate is a chemical compound, with chemical formula CaCO3. ... In general, a polymorph is something that can exist in several states or forms. ... Doubly refracting Calcite from Iceberg claim, Dixon, New Mexico. ... Aragonite Aragonite is a polymorph of the mineral calcite, both having the chemical composition CaCO3. ... A substance is soluble in a fluid if it dissolves in that fluid. ... Calcium carbonate is a chemical compound, with chemical formula CaCO3. ... Water (from the Old English word wæter; c. ... Doubly refracting Calcite from Iceberg claim, Dixon, New Mexico. ... Aragonite Aragonite is a polymorph of the mineral calcite, both having the chemical composition CaCO3. ... Mineral water is water containing minerals or other dissolved substances that alter its taste or give it therapeutic value. ... (choleliths) are crystalline bodies formed within the body by accretion or concretion of normal or abnormal bile components. ... Hot metal work from a blacksmith In chemistry, a metal (Greek: Metallon) is an element that readily forms ions (cations) and has metallic bonds, and metals are sometimes described as a lattice of positive ions (cations) in a cloud of electrons. ... Doubly refracting Calcite from Iceberg claim, Dixon, New Mexico. ... Aragonite Aragonite is a polymorph of the mineral calcite, both having the chemical composition CaCO3. ...