Inosilicate (chain silicate), amphibole
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 ultraviolet light
Potassic-richterite is a relatively new mineral, approved in 2018.
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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