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Formula: Mn2+Sn4+(OH)6
Hydroxide, stottite subgroup,
perovskite supergroup,
tetragonal paramorph of isometric
wickmanite, manganese-bearing
mineral
Crystal System: Tetragonal
Specific gravity: 3.65 to 3.79 measured
Hardness: 3½ to 4½
Streak: White
Colour: Honey-yellow, brown-orange
Environments
Pegmatites
Metamorphic environments
Localities
At the Långban mine, Långban Ore District, Filipstad, Värmland County, Sweden, tetrawickmanite was found on a
museum specimen from the metamorphosed
iron-manganese orebody, associated
with magnetite and baryte
(HOM).
At the type locality, the Foote Lithium Co. Mine, Kings Mountain Mining District, Cleveland county, North Carolina,
USA, tetrawickmanite occurs as a very rare late-formed mineral in fractures in a
lithium-rich pegmatite.
Associated minerals include bavenite,
eakerite, albite,
quartz and
siderite-rhodochrosite.
Crystals up to 1 mm in diameter belong to the tetragonal crystal system, point group 4/m, and they showed the crystal
forms {112} (tetragonal dipyramid), {001} (pinacoid) and {100} (tetragonal prism)
(AM 58.966-967, HOM).
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