Hydroxylhedyphane
Hydroxylhedyphane is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ca₂Pb₃(AsO₄)₃(OH).
It crystallizes in the hexagonal crystal system (space group P3). It is a member of the Apatite structural group.
Key properties: Mohs hardness 4–5; specific gravity 6.205; Vitreous luster; optically uniaxial.
IMA symbol Hhdy, IMA status: approved, named in 2018.
Occurs as fracture-fillings cutting braunite and hausmannite ore in a complexly deformed and metamorphosed submarine, volcanogenic, massive sulfide deposit.
It is found associated with Calcite, barytocalcite.
The prefix indicates the (OH)-dominant analogue of hedyphane.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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