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Formula: K2NaCa2TiSi7O18(OH)O
Inosilicate (chain silicate), titanium-bearing mineral
Crystal System: Triclinic
Specific gravity: 2.82 to 2.90 measured, 2.85 calculated
Hardness: 6
Streak: White
Colour: Yellowish, greyish-white
Solubility: Insoluble in acids
Common impurities: Al,Fe,Mg,H2O
Environments
Metamorphic environments
Hydrothermal environments
Localities
At the type locality, the Murunskii Massif, Chara and Tokko Rivers Confluence, Aldan Shield, Russia,
tinaksite occurs in well-bounded prismatic crystals from tenths of a mm to several cm, often grouped in
radiating fibrous aggregates and rosettes up to 3-5 cm in diameter. It is found as an accessory in
K-feldspar
metasomatites at the contact of the massif with
limestone. The
metasomatites consist of
K-feldspar, aegirine,
quartz, canasite and
xonotlite
(AM 50.2098-2099).
At Apatitovyi Tsirk, Rasvumchorr Mine, Rasvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia, tinaksite is
associated with orthoclase,
pyroxene, aegirine,
astrophyllite and hisingerite
(HOM).
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