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Arsenate

Irhtemite

Ca₄Mg(AsO₄)₂(AsO₃OH)₂·4H₂O
Crystal systemMonoclinic
ClassArsenate
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Irhtemite specimen

Irhtemite Locality: Ightem Mine (Irhtem Mine), Ightem, Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco Field of view 7 mm. Not analyzed, maybe Vladimirite. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0

Irhtemite

Irhtemite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ca₄Mg(AsO₄)₂(AsO₃OH)₂·4H₂O.

It crystallizes in the monoclinic crystal system.

Key properties: specific gravity 3.09; Silky luster; optically biaxial.

IMA symbol Irh, IMA status: approved, named in 1971.

Probably a dehydration product of picropharmacolite in hydrothermal ore deposits.

It is found associated with Sainfeldite, erythrite (Irhtem mine, Morocco).

The name refers to its occurrence in the Irhtem (Ightem) mine, Morocco.

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 I minerals or help write this entry.