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ATHENA

MINERALOGY

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Mineral: TVRDYITE
Name: Tvrdýite
Formula: Fe2+Fe3+2Al3(PO4)4(OH)5(H2O)4.2H2O
Crystal System: Monoclinic
Group: Beraunite group
IMA Number: 2014-082
References: MM 79 (2015), 51-58; MM 80 (2016), 1077; AM 102 (2017), 920
Type Locality: Huber stock (open pit), Krásno (Schönfeld), Horní Slavkov (Schlaggenwald), Karlovy Vary, Cechy (Bohemia), Czech Republic

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