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ATHENA

MINERALOGY

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Mineral: IANGREYITE
Formula: Ca2Al7(PO4)2(PO3OH)2(OH,F)15.8H2O
Crystal System: Rhombohedral (Trigonal)
Group: Related to Alunite-Jarosite group. Perhamite structure.
IMA Number: 2009-087
References: MM 75/2 (2011), 327; AM 98 (2013), 280
Type Locality: Silver Coin mine, Nevada, USA. Krásno ore district, Horní Slavkov, Czech Republic

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