Formula : Fe3+[OH/Te24+O5]
System: tetragonal Hardness:4½ Rarity:rare
Strunz id:IV/K.12-30 -
OXIDES and HYDROXIDES
Name origin: For John William Mackay (1831-1902), Irish-American financier and mine operator on the Comstock lode, Nevada, who endowed the School of Mines of the University of Nevada (also honored by naming the school the Mackay School of Mines).
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