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Formula: Sr5(PO4)3F
Phosphate, apatite group,
apatite supergroup,
strontium-bearing mineral
Crystal System: Hexagonal
Specific gravity: 3.915 calculated
Hardness: 5
Streak: White
Colour: Colourless with a pale greenish tint
Luminescence: Cream-coloured fluorescence under short wave UV
Environments
Pegmatites
Hydrothermal environments
Localities
At the type locality, the Kirovskii apatite mine, Kukisvumchorr Mt, Khibiny Massif, Murmansk Oblast,
Russia, stronadelphite was found in the Belovitovoye peralkaline
pegmatite formed from hydrothermal alteration in a sinuous
and branched vein cross-cutting nepheline syenite in the
alkaline massif. Associated minerals include natrolite,
microcline, aegirine,
pectolite, lamprophyllite,
belovite-(Ce),
belovite-(La),
gaidonnayite,
nenadkevichite, komarovite,
manganokukisvumite,
epididymite, sphalerite and
neotocite.
Stronadelphite forms hexagonal, transparent, prismatic to acicular crystals up to 0.1 × 0.1 × 2
mm3, combined in sheaf-like clusters up to 1 × 2 mm embedded in
natr
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