Petersite-(La)
Petersite-(La) is an IMA-recognized mineral species in the phosphate class, with the chemical formula Cu₆La(PO₄)₃(OH)₆·3H₂O.
It crystallizes in the hexagonal crystal system (space group P6_3/m). It is a member of the Mixite structural group.
Key properties: Mohs hardness 3; specific gravity 3.33; [Vitreous.] luster; optically uniaxial.
IMA symbol Pts-La, IMA status: approved, named in 2018.
A secondary phase derived by weathering copper sulfides. In small cavities coated by chrysocolla in quartz veins.
It is found associated with Pseudomalachite, malachite.
La-dominant analogue of petersite-(Y) and petersite-(Ce).
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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