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Arsenate

Yvonite

Cu(AsO₃OH)·2H₂O
Hardness3.5–4
Crystal systemTriclinic
ClassArsenate
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Yvonite specimen

Yvonite Locality: Salsigne mine, Salsigne , Mas-Cabardès , Carcassonne , Aude , Languedoc-Roussillon , France ( Locality at mindat.org ) Field of view 4 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0

Yvonite

Yvonite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Cu(AsO₃OH)·2H₂O.

It crystallizes in the triclinic crystal system (space group P-1).

Key properties: Mohs hardness 3.5–4; specific gravity 3.2; Blue streak; Vitreous luster; optically biaxial.

IMA symbol Yv, IMA status: approved, named in 1995.

A secondary mineral formed on specimens from mine dumps at a gold-bearing arsenic sulfide deposit.

It is found associated with Geminite, lindackerite, arsenopyrite, bismuth, chalcopyrite, pushcharovskite.

The mineral was named to honor Klaus Yvon (1943–), Professor of Crystallography, Geneva University, Geneva, Switzerland.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more Y minerals or help write this entry.