Hydrated normal phosphate
Specific gravity: 2.05
Solubility: Dissolves completely in cold 1% hydrochloric acid, and partly decomposed in hot water (Mindat)
Nastrophite occurs in pegmatitic veinlets in
cancrinite and nepheline
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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