Archives for the month of: October, 2011

Whewellite is a mineral, hydrated calcium oxalate, formula CaC2O4·H2O. Because of its organic content it is thought to have an indirect biological origin and this is supported by it being found in coal and sedimentary nodules. However, it has also been found in hydrothermal deposits where a biological source appears improbable. For this reason it can be classed as true mineral.

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Olmite ideally is a newly identified mineral from the N’Chwaning II mine of the Kalahari manganese fields (Republic of South Africa), which occurs as a product of hydrothermal alteration associated with poldervaartite, celestine, sturmanite, bultfonteinite and hematite.Olmiite is the Mn2 +-dominant analogue of Poldervaartite. Colors are pale to intense reddish pink. It is a product of hydrothermal alteration. It is a beautiful gemstone!

 

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