Formula: Mg6Fe3+2(CO3)(OH)16.4H2O
Hydrated carbonate containing hydroxyl
Specific gravity: 2.1 to 2.14
Hardness: 2½
Streak: White
Colour: Yellow to brownish-white, white, gray, silver-white, greenish or colourless

Metamorphic environments
Hydrothermal environments

Pyroaurite occurs in low-temperature hydrothermal veins, in serpentinite, and as an authigenic (formed in place) weathering product (HOM). It commonly originates as a low temperature alteration product of magnetite and may also be an alteration product of iowaite (Mindat). Associated minerals include calcite, magnesite, aragonite, hydromagnesite, artinite, dolomite, brucite, clinopyroxene, olivine, talc, phlogopite and spinel (HOM).

Common impurities: Cr,Al,Mn

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