Shkatulkalite

shkatulkalite

vuonnemite

manganoneptunite

ussingite

Images

Formula: Na₂Nb₂Na₃Ti(Si₂O₇)₂O₂(FO)(H₂O)₄(H₂O)₃
Sorosilicate (Si₂O₇ groups), lamprophyllite group, seidozerite supergroup, niobium- and titanium- bearing mineral
Crystal System: Triclinic
Specific gravity: 2.70 measured, 2.72 calculated
Hardness: 3
Colour: Colourless to silver-white, yellow, light pink, creamy white
Solubility: Unreactive with 10% hydrochloric or nitric acid
Environments

Pegmatites

Localities

At the type locality, the Shkatulka pegmatite, Umbozero mine, Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia, shkatulkalite occurs in the ultra-agpaitic pegmatite as rectangular lamellae and tabular grains to 1.0 mm, as mica-like aggregates to 3 cm, and as cryptocrystalline partial pseudomorphs of vuonnemite and masses on it. Shkatulkalite is colourless, silvery white or light pink in thin plates, and creamy or yellowish in thick plates (AM 82.432).
Other associated minerals include manganoneptunite, ussingite and aegirine (Mindat Photo).
Shkatulkaite from the Shkatulka pegmatite - Image

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