Metahohmannite
Metahohmannite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Fe³⁺₂O(SO₄)₂·4H₂O.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Amarantite structural group.
Key properties: specific gravity 2.568; optically biaxial.
IMA symbol Mhoh, grandfathered status — known before the IMA’s founding, named in 1938.
Formed by the partial dehydration of hohmannite.
It is found associated with Hohmannite.
The prefix, from the Greek, meta, indicates a lower hydrate than hohmannite.
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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