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Angastonite - Sold


Mills et al. (2008) named angastonite after Angaston, a phosphorite mining town in South Australia. Angastonite is a hydrated calcium magnesium aluminum phosphate which forms at a contact between limestone and phosphorite. Vincent Peisley collected some of the material in the late 1980s, and subsequent mining has past through this zone. No further specimens have been produced since the 1980s. Angastonite here appears to form pseudomorphous replacements of an unknown prismatic mineral in crystals to 0.5 mm. The matrix is quite friable and strongly contrasting dark brown.