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Arsenate

Yanomamite

In(AsO₄)·2H₂O
Hardness3.5–4
Crystal systemOrthorhombic
ClassArsenate
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Yanomamite specimen

Yanomamite Locality: Mangabeira deposit, Monte Alegre de Goiás, Goiás, Brazil White to pale green crusts of yanomamite. Field of view 2 mm. — Photo: Leon Hupperichs · CC BY-SA 3.0

Yanomamite

Yanomamite is an IMA-recognized mineral species in the arsenate class, with the chemical formula In(AsO₄)·2H₂O.

It crystallizes in the orthorhombic crystal system (space group Pbca).

Key properties: Mohs hardness 3.5–4; specific gravity 3.876; White streak; Vitreous luster; optically biaxial.

IMA symbol Yan, IMA status: approved, named in 1990.

A rare secondary mineral replacing arsenopyrite in quartz-topaz greisen veins in granite.

It is found associated with Scorodite, arsenopyrite, indium-rich sphalerite, topaz, cassiterite.

The name refers to the Yanomami Indians, residents of the Amazon basin.

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.