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Formula: Ca2Pb3(AsO4)3(OH)
Arsenate,
hedyphane group,
apatite supergroup
Crystal System: Trigonal
Specific gravity: 6.205 calculated
Hardness: 4 to 5
Colour: Colourless
Environments
Hydroxylhedyphane is a relatively new mineral, approved in 2018.
Localities
At the type locality, the Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden,
hydroxylhedyphane has been discovered in a complexly deformed and metamorphosed submarine,
volcanogenic, massive sulphide deposit. It occurs as colourless prismatic crystals, up to 2.5 cm in length,
forming an oriented intergrowth with a
serpentine subgroup mineral, as fracture-fillings
cutting braunite and
hausmannite ore
(EJM 31.5.1015-1024, HOM).
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