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Formula: Mg6Fe3+2(CO3)(OH)16.4H2O
Hydrated carbonate containing hydroxyl, hydrotalcite group,
hydrotalcite supergroup
Crystal System: Trigonal
Specific gravity: 2.1 to 2.14 measured, 2.12 calculated
Hardness: 2½
Streak: White
Colour: Yellow to brownish-white, white, gray, silver-white, greenish or colourless
Common impurities: Cr,Al,Mn
Environments:
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).
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