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Formula: NaSr(PO4).9H2O
Hydrated normal phosphate
Specific gravity: 2.05
Hardness: 2
Streak: White
Colour: Colourless
Solubility: Dissolves completely in cold 1% hydrochloric acid, and partly decomposed in hot water (Mindat)
Environments
Nastrophite occurs in pegmatitic veinlets in
cancrinite and nepheline
syenites
(Webmin).
Localities
At the Kovdor Zheleznyi Mine, Kovdor Massif, Murmansk Oblast, Russia, nastrophite is associated with
cattiite in cavities in dolomite
carbonatite
(Minrec 35.4.346).
There are two co-type Localities, Alluaiv Mountain and Karnasurt Mountain, both in the Lovozersky District,
Murmansk Oblast, Russia. Nastrophite occurs as crystals up to 3 mm and as deposits of irregular form up to
1 cm across. Associated minerals include cancrinite,
aegirine, vuonnemite,
epistolite, mountainite,
villiaumite, kogarkoite and,
surprisingly, thermonatrite
At Alluaiv Mountain nastrophite occurs in pegmatitic
veins and veinlets in cancrinite
syenite.
On Karnasurt Mountain nastrophite occurs in veinlets cutting
nepheline syenite.
(AM 67.857).
Additional associated minerals include steenstrupine-(Ce) and
ilmajokite at Karnasurt, and
K-feldspar, sodalite,
analcime, natrolite and
davyne at Alluaiv Mountain
(HOM).
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