Aragonite (also called Chinese Larimar) (0.3-2 kilo) The world's most beautiful found in China.

The mineral aragonite is a calcium carbonate with chemical formula CaCO3. It is an unstable polymorph of calcite and is therefore difficult to distinguish from calcite because most of the properties are similar. A distinction can be made by means of a color test: with a Feigl solution, aragonite turns black, while calcite remains colorless. In addition, aragonite is slightly harder than calcite and can be determined by a scratch test which mineral it is. A third method of distinction is the habitus: aragonite usually grows in needle-shaped crystals (acicular), while calcite has a leaf-shaped habitus. With the help of powder diffraction the difference can be determined unequivocally because aragonite has an orthorhombic structure and not a trigonal structure like calcite. Aragonite is always formed at low temperatures close to the Earth's surface. Aragonite is found in geysers, hot springs, caves, as oolites in shallow seas, in shells, and in pearls. Sites in Europe are Aragón (Spain), Limousis (France), Girgenti (Sicily), Bilin (Bohemia) and Eisenertz (Austria).