Wermlandite

wermlandite

hydrotalcite

magnetite

Långban

Images

Formula: Mg₇Al₂(OH)₁₈[Ca(H₂O)₆](SO₄)₂.6H₂O
Hydrated sulphate containing hydroxyl, wermlandite group of the hydrotalcite supergroup
Crystal System: Trigonal
Specific gravity: 1.932 measured, 1.96 calculated
Hardness: 1½
Streak: White to light grey-green
Colour: Green-grey
Luminescence: Not fluorescent under UV
Solubility: Dissolved completely by cold 1:1 hydrochloric acid
Environments

Hydrothermal environments

Localities

At the type locality, the Långban mine, Långban Ore District, Filipstad, Värmland county, Sweden, wermlandite occurs as a low temperature vein filling as plates up to 1 cm in diameter, with breadth to thickness 20:1, implanted along large calcite crystals and associated with magnetite . (AM 57.327, Mindat).

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