Welinite

welinite

sarkinite

adelite

hausmannite

Images

Formula: Mn²⁺₆(W⁶⁺☐)(SiO₄)₂O₄(OH)₂
Nesosilicate (insular SiO₄ groups), welinite group, manganese- and tungsten- bearing mineral
Crystal System: Trigonal
Specific gravity: 4.47 measured, 4.41 calculated
Hardness: 4
Streak: Pale reddish brown
Colour: Orange-red, deep red-brown to reddish black
Common impurities: Fe,Sb,H₂O
Environments

Pegmatites
Metamorphic environments

Localities

At the Sjögruvan, Grythyttan, Hällefors, Örebro County, Sweden, welinite is associated with hausmannite and dolomite (AM 53.1064).

At the type locality, the Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden, welinite occurs in small amounts embedded in calcite, baryte, sarkinite and adelite, fillings fissure in compact hausmannite ore.
Welinite occurs as resinous, deep red-brown to reddish-black up to 2 cm crystal sections (AM 53.1064).

Back to Minerals