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Formula: K(NaCa)Mg5Si8O22(OH)2
Inosilicate (chain silicate), richterite root name group,
amphibole
Crystal System: Monoclinic
Specific gravity: 3.075 calculated
Hardness: 5 to 6
Streak: Greyish white
Colour: Straw yellow to brown
Luminescence: No fluorescence effects have been observed under UV
Environments
Pegmatites
Metamorphic environments
Potassic-richterite is a relatively new mineral, approved in 2018.
Localities
There are two co-type Localities, the Harstigen Mine and the Stora Pajsberg Mine, both at Pajsberg, Persberg ore
district, Filipstad, Värmland County, Sweden. Here potassic-richterite occurs as subhedral to anhedral
short prismatic crystals, with average crystal size of 1–2 mm, exceptionally up to 4 mm long. Associated minerals
include calcite,
oxyplumboroméite,
jacobsite, magnesium-bearing
tephroite and
manganophyllite
(Mindat).
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