Ikaite
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Ikaite is the mineral name for the hexahydrate of calcium carbonate, CaCO3·6H2O. Ikaite tends to form very steep or spiky pyramidal crystals, often radially arranged, of varied sizes from thumbnail si
Glendonite (calcite pseudomorph after ikaite)
Monohydrocalcite
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Monohydrocalcite is a mineral that is a hydrous form of calcium carbonate, CaCO3·H2O. It was formerly also known by the name hydrocalcite, which is now discredited by the IMA. It is a trigonal mineral
Colorless monohydrocalcite crystals
The crystal structure of monohydrocalcite. Ca is shown as a blue atom, O atoms red, and the carbonate anion and water molecules are shown as bonded entities.