Deloneite

belovite

pegmatite

Formula: (Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5 (CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5
Phosphate, belovite group, apatite supergroup
Specific gravity: 3.92
Hardness: 5
Streak: White
Colour: Bright yellow
Solubility: Readily soluble in 10% hydrochloric or nitric acid at room temperature (Mindat)
Environments

Pegmatites

At the type locality, the Koashva Open Pit, Khibiny Massif, Murmansk Oblast, Russia, deloneite occurs in the natrolite core of a pegmatite, associated with fluorcaphite, belovite-(Ce), lomonosovite, sitinakite and fluorite (HOM, Mindat, AM 82.820).

Back to Minerals