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Formula: NaCa2Mg5(Si7Al)O22F2
Inosilicate (chain silicate)
Crystal System: Monoclinic
Specific gravity: 3.09 calculated
Hardness: 5 to 6
Streak: Grey-white, yellowish white
Colour: Light green to light yellow, grey-black
Luminescence: Strongly fluoresces creamy white under UV
Environments
Volcanic igneous environments
Hydrothermal environments
Localities
At the type locality, Mt Calvario, Biancavilla, Metropolitan City of Catania, Sicily, Italy, fluoro-edenite
was found both as prismatic or acicular crystals of millimetric size and as fibres in the rock cavities in grey-red
altered benmoreitic lavas. It is intense yellow in colour, and
associated with feldspars, quartz,
clino- and ortho- pyroxene,
fluorapatite, ilmenite and
hematite, and probably crystallised from late-stage hydrothermal fluids
(AM 86.1489-1493).
Amity, Town of Warwick, Orange county, New York, USA, is an area of
granite intrusions into
marble and associated
gneiss. The marble is
mostly composed of white crystalline calcite that often has small flakes
or spheres of graphite and
phlogopite. Fluoro-edenite occurs as small, green to brown, stubby
crystals in marble and strongly fluoresces a creamy white colour
(R&M 96.5.437).
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