Garpenbergite

garpenbergite

carlfrancisite

stibarsen

paradocrasite

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Formula: Mn6☐AsSbO10(OH)2
Oxide, manganese, arsenic and antimony bearing mineral
Specific gravity: 4.47 calculated
Hardness: 5
Streak: Blackish to greyish brown
Colour: Brown
Environments

Metamorphic environments

Garpenbergite is a new mineral, approved in 2020, and to date (March 2022) 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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