Abstract

Abstract Stringhamite, CaCuSiO4·H2O, is a deep blue, hydrous copper calcium silicate, originally discovered at the Bawana mine, Beaver County, Utah (Hindman 1976). Its structure was determined on crystals from the Christmas mine, Gila County, Arizona (Hawthorne 1985). The monoclinic crystals, up to 0.1 mm across, from the type locality are dominated by the forms {011} and {101}, modified by {010} and {111}. At the Bawana mine, stringhamite occurs with thaumasite on fractures in a diopside-magnetite skarn. At the Christmas mine, it is found with wollastonite and whelanite.

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