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Brushite
Brushite
is a phosphate mineral with the chemical formula CaHPO4·2H2O. It forms colorless to pale yellow monoclinic prismatic crystals and as powdery or earthy masses.[2][4] It is the phosphate analogue of the arsenate pharmacolite and the sulfate gypsum. Discovery and occurrence[edit] Brushite
Brushite
was first described in 1865 for an occurrence on Aves Island, Nueva Esparta, Venezuela, and named for the American mineralogist George Jarvis Brush (1831–1912).[3] It is believed to be a precursor of apatite and is found in guano-rich caves, formed by the interaction of guano with calcite and clay at a low pH. It occurs in phosphorite deposits and forms encrustations on old bones. It may result from runoff of fields which have received heavy fertilizer applications.[3] Associated minerals include tanarakite, ardealite, hydroxylapatite, variscite and gypsum.[2] Brushite
Brushite
is the original precipitating material in calcium phosphate kidney stones.[5] References[edit]

^ Mineralienatlas ^ a b c Brushite
Brushite
in the Handbook of Mineralogy ^ a b c Brushite
Brushite
on Mindat.org ^ a b Webmineral data ^ "Brushite". Virtual Museum of Molecules and Minerals. Retrieved 22 December 2017. 

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