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Formula: AgMnAsS3
Valence: Ag1+Mn2+As3+S2-3
Sulpharsenite, silver- and
manganese- bearing mineral
Crystal System: Tetragonal
Specific gravity: 4.680 calculated for the empirical formula
Hardness: 2 to 2½
Streak: Reddish brown
Colour: Dark grey
Environments
Localities
At the type locality, Uchucchacua Mine, Uchucchacua area, Oyón District, Oyón Province, Lima, Peru,
manganoquadratite occurs as dark grey, anhedral to subhedral grains up 0.5 mm across, closely associated
with alabandite, Mn-rich
calcite, Mn-rich sphalerite,
proustite, pyrite,
pyrrhotite, tennantite,
argentotennantite,
stannite, and other unnamed minerals of the system Pb-Ag-Sb-Mn-As-S.
Manganoquadratite is opaque with a metallic lustre and a reddish-brown streak. Internal reflections are
absent
(AM 97.7.1199-1205).
The occurrence is a complex vein-type polymetallic hydrothermal deposit
(HOM).
Manganoquadratite from Uchucchacua Mine -
Image
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