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Formula: NaCa2Mg5(Si7Al)O22(OH)2
Inosilicate (chain silicate) amphibole
Crystal System: Monoclinic
Specific gravity: 3.05 to 3.37 measured, 3.06 calculated
Hardness: 5 to 6
Streak: White
Colour: Green, brown, white
Common impurities: Ti,Mn,K,P
Environments:
Plutonic igneous environments
Metamorphic environments
Edenite occurs in intermediate plutonic igneous rocks and in medium-grade metamorphic rocks such as
amphibolite and
marble
(HOM).
Localities
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. Edenite is an uncommon
amphibole that occurs associated with
phlogopite as stubby weathered crystals to 7 cm in matrix
(R&M 96.5.436).
At Edenville, Town of Warwick, Orange county, New York, USA, edenite is associated with
titanite,
mica and chondrodite
(HOM).
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