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Formula: Ca2Sr3(PO4)3F
Phosphate, hedyphane group, apatite
supergroup, strontium-bearing mineral
Crystal System: Hexagonal
Specific gravity: 3.842 calculated
Hardness: 5
Colour: Colourless to yellowish white
Luminescence: No fluorescence under UV
Environments
Fluorsigaiite is a new mineral, approved in 2021.
Localities
At the type locality, the Fluorsigaiite type locality, Saima complex, Fengcheng City, Dandong, Liaoning, China,
fluorsigaiite is a new strontium analogue of
fluorphosphohedyphane and a new member of the
apatite supergroup. It was discovered in
lujavrite from the Saima alkaline complex. Fluorsigaiite commonly
occurs as colourless to yellowish white individual prismatic, columnar and platy crystals of 10 to 50 μm in size,
associated with microcline,
nepheline, aegirine,
natrolite, eudialyte,
fluorapatite, a
fluorstrophite-like mineral,
stronadelphite and calcite.
Occasionally, crystals of fluorsigaiite form prismatic aggregates in the interstices of
lujavrite.
Fluorsigaiite was probably formed from strontium-rich fluids at
late-magmatic or hydrothermal stage of the Saima lujavrite
(MM 86.6.940-947).
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