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MINERALOGY

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Mineral: PUMPELLYITE-(Mg)
Formula: Ca2MgAl2(SiO4)(Si2O7)(OH)2.H2O
Crystal System: Monoclinic
Group: Pumpellyite group
IMA Number: 1973 s.p.
References: AM 61 (1976), 176; AM 68 (1983), 1250; AM 77 (1992), 1307; HB2/2 (1995); EJM 30 (2018), 1133
Type Locality: Calumet, Keweenawan copper deposit, Houghton Co, Michigan, USA

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