Sitinakite

sitinakite

natrolite

vinogradovite

aegirine

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Formula: KNa₂Ti₄Si₂O₁₃(OH).4H₂O
Nesosilicate (insular SiO₄ groups)
Crystal System: Tetragonal
Specific gravity: 2.86 measured, 2.89 measured
Hardness: 4½
Streak: White
Colour: Colourless, light brown to pale rose, pinkish brown
Solubility: Insoluble in water, hydrochloric and nitric acid
Common impurities: Ca,Sr,Ba,Ce,Fe,Nb,Ta,Zr,TR
Environments

Pegmatites
Hydrothermal environments

Sitinakite occurs in hydrothermally altered portions of alkalic pegmatites in a differentiated alkalic massif. Associatied minerals include nepheline, natrolite, aegirine, microcline, apatite and vinogradovite (HOM).

Localities

There are two co-type localities, the Kirovskii apatite mine, Kukisvumchorr Mountain, and Yukspor Mountain, both in the Khibiny Massif, Murmansk Oblast, Russia.
At Kukisvumchorr Mountain sitinakite occcurs in a hydrothermal vein and in two pegmatite veins. Associated minerals include natrolite, vinogradovite and aegirine (Dana).

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