Yellow green acicular crystals of the very rare vanadium mineral metamunirite, known from a very few localities worldwide. From: Yellow Cat Mesa, Grand County, Utah, United States of America. — Photo: David Hospital · CC BY-SA 4.0
Metamunirite
Metamunirite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula NaV⁵⁺O₃.
It crystallizes in the orthorhombic crystal system (space group Pnma).
Key properties: specific gravity 2.877; optically biaxial.
IMA symbol Mmni, IMA status: approved, named in 1990.
Extremely rare, in cavities in vanadium-bearing sandstone.
It is found associated with Rossite, metarossite, pascoite, clay minerals.
The name refers to its relation to munirite, from which it may form by dehydration.
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 M minerals or help write this entry.