Images
Formula: Mg2Fe4Zn2Sb2O14(OH)2
Oxide, antimony-bearing mineral
Crystal System: Hexagonal
Specific gravity: 5.13 calculated
Hardness: 6 to 7
Streak: Brown
Colour: Black, (translucent dark red)
Environments
Occurrence:approved in 2000
Localities
At the type locality, the Garpenberg Norra mine (North), Garpenberg, Hedemora, Dalarna County, Sweden, the deposit
consists of
zinc-lead-iron-copper-antimony-silver
mineralised supracrustal units (marble and altered
felsic volcaniclastic rocks). The sulphide ores, dominated by
sphalerite, galena and
pyrite, form lenses and veinlets in close association with
dolomite marble and
silicate skarn.
The peak conditions of metamorphism of the area are estimated to be temperature greater than 550°C and pressure less
than 3.5 kbar.
The investigated sample, about 50 x 30 x 20 mm in size, was collected from a
skarn enclave within dolomite
marble. It is dominated by a reddish orange
amphibole-rich assemblage, with individual crystal fibres up to 10 mm in
length, in contact with granular dolomite and
calcite. The dominant species is
manganese-bearing tremolite,
which commonly contains patchy inclusions and overgrowths of zinc-bearing
clino-suenoite. The latter mineral is suspected to be
responsible for a rather intense yellow-orange response of the assemblage in ultraviolet light at a wavelength of
254 nm. The amphiboles are intimately associated with minor amounts of
manganese-bearing talc. Irregular
black clusters in the rock consist mainly of franklinite and
rinmanite. Microscopic amounts of baryte and
svabite also have been detected.
Rinmanite occurs both as isolated crystals within the silicate matrix, commonly adjacent to
talc, and in aggregates lining
franklinite
(CM 39.1675-1685).
Rinmanite from Garpenberg Norra Mine - Image
Back to Minerals