Ershovite

ershovite

rasvumite

vuonnemite

shcherbakovite

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Formula: K₃Na₄(Fe,Mn,Ti)₂Si₈O₂₀(OH,O)₄.4H₂O
Inosilicate (chain silicate), manganese- and titanium- bearing mineral
Crystal System: Triclinic
Specific gravity: 2.75 measured, 2.73 calculated
Hardness: 2 to 3
Streak: White
Colour: Olive-green with brownish or yellowish shades
Luminescence: Not fluorescent under UV
Solubility: Slightly soluble in weak hydrochloric, nitric and sulphuric acids
Common impurities: Mg,Ca
Environments

Pegmatites

Localities

There are two co-type localities, the Koashva Open Pit, Koashva Mt, and Rasvumchorr Mt, bothe at the Khibiny Massif, Murmansk Oblast, Russia.
At the type localities ershovite occurs in unweathered (subsurface) pegmatites. It forms disseminated elongate grains with a maximum dimension of 10 mm and parallel fibrous aggregates up to 3 cm long. Associated minerals include orthoclase, nepheline, sodalite, aegirine, alkali amphibole, villiaumite, natrite, rasvumite, vuonnemite, astrophyllite, shcherbakovite, kazakovite, koashvite, thermonatrite and nacaphite (AM 79.1010).

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