Hydroxylpyromorphite
Hydroxylpyromorphite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Pb₅(PO₄)₃(OH).
It crystallizes in the hexagonal crystal system (space group P6_3/m). It is a member of the Apatite structural group.
Key properties: Mohs hardness 3.5–4; specific gravity 7.32; White streak; Vitreous luster; optically uniaxial.
IMA symbol Hpm, IMA status: approved, named in 2017.
A geogenic secondary lead phase and not post-mining in origin.
It is found associated with Quartz.
Prefix, hydroxyl, identifies a member of the pyromorphite group with dominant (OH)– in the X position.
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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