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Formula: Mn6☐AsSbO10(OH)2
Oxide, manganese, arsenic and
antimony bearing mineral
Crystal System: Orthorhombic
Specific gravity: 4.47 calculated
Hardness: 5
Streak: Blackish to greyish brown
Colour: Brown
Environments
Garpenbergite is a new mineral, approved in 2020, and to date (May 2023) reported only from the type locality.
Localities
At the type locality, Garpenberg, Hedemora, Dalarna County, Sweden, garpenbergite has been found in a small
sample about 2 cm × 1.5 cm × 1 cm, in a filled fracture together with mainly
carlfrancisite. Minor
stibarsen and paradocrasite
appear in fractures of the garpenbergite, and filipstadite has
been observed in a few cases, as tiny overgrowths on garpenbergite. The
skarn matrix consists of granular
jacobsite, alleghanyite,
kutnohorite and dolomite.
Crystals of garpenbergite are short-prismatic, up to 1.5 mm in length
(MM 86.1.1-8).
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