Orthominasragrite
Orthominasragrite is an IMA-recognized mineral species in the vanadate class, with the chemical formula V⁴⁺O(SO₄)·5H₂O.
It crystallizes in the orthorhombic crystal system (space group Pmn2_1). It is a member of the Minasragrite structural group.
Key properties: Mohs hardness 1; specific gravity 2; Pale blue streak; Vitreous luster; optically biaxial.
IMA symbol Omrg, IMA status: approved, named in 2000.
Found in a silicified tree, formed as an oxidation product of pyrite reacting with vanadium-rich organic material.
It is found associated with Minasragrite, pyrite, szomolnokite, kornelite, ferricopiapite, rozenite, montroseite, sulfur.
As the ORTHOrhombic polymorph of minasragrite.
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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