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Edenite
Amphibole, double chain inosilicate mineral / From Wikipedia, the free encyclopedia
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Edenite or edenitic hornblende is a double chain silicate mineral of the amphibole group with the general chemical composition NaCa2Mg5(Si7Al)O22(OH)2. Edenite is named for the locality of Edenville, Orange County, New York, where it was first described.[4]
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Edenite | |
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![]() Edenite crystal from Bancroft District, Ontario | |
General | |
Category | Amphibole mineral |
Formula (repeating unit) | NaCa2Mg5(Si7Al)O22(OH)2 |
IMA symbol | Ed[1] |
Strunz classification | 9.DE.15 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | C2/m |
Unit cell | a = 9.83, b = 17.95 c = 5.3 [Å], β = 105.18°; Z = 2 |
Identification | |
Formula mass | 834.25 g/mol |
Color | White to gray, pale to dark green, also brown and pale pinkish-brown |
Crystal habit | Prismatic crystals, fibrous, as reaction rims on pyroxenes |
Twinning | Simple or multiple parallel to {010} |
Cleavage | Good on (110) |
Fracture | Conchoidal |
Tenacity | Brittle |
Mohs scale hardness | 5–6 |
Luster | Vitreous |
Streak | White |
Diaphaneity | Semitransparent |
Specific gravity | 3.05–3.37 |
Optical properties | Biaxial (+) |
Refractive index | nα = 1.606 – 1.649, nβ = 1.617 – 1.660, nγ = 1.631 – 1.672 |
Birefringence | δ = 0.025 |
Pleochroism | Distinct, greens, blue-greens, and yellow-browns |
2V angle | 50–82° |
References | [2][3][4][5] |
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