Gedrite

Gedrite

Infobox mineral
name = Gedrite
category = Inosilicate
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boxbgcolor =


caption =
formula = (Mg;Fe2+)2 [(Mg;Fe2+)3Al2] (Si6Al2)O22(OH)2
molweight =
color = White, gray, brown, green
habit = bladed and prismatic crystals; fibrous and sheath like aggregates.
system = Orthorhombic; 2/m 2/m 2/m
twinning =
cleavage = 56 and 126° - good; {210} perfect
fracture = Splintery
mohs = 5.5 - 6
luster = Vitreous to silky
refractive = nα = 1.671 nβ = 1.681 nγ = 1.690
opticalprop = Biaxial (+)
birefringence = δ = 0.019
pleochroism = Weak to moderate
streak =
gravity = 3.18 - 3.33
density =
melt =
fusibility =
diagnostic =
solubility =
diaphaneity = Translucent, will transmit light on thin edges.
other =
references = http://www.handbookofmineralogy.org/pdfs/gedrite.pdf Handbook of Mineralogy] http://webmineral.com/data/Gedrite.shtml Webmineral] [http://www.mindat.org/min-1665.html Mindat]

Gedrite is a silicate mineral of the amphibole group with formula: (Mg;Fe2+)2 [(Mg;Fe2+)3Al2] (Si6Al2)O22(OH)2. Gedrite occurs in contact and medium to high grade metamorphic rocks in association with garnet, cordierite, anthophyllite, cummingtonite, sapphirine, sillimanite, kyanite, quartz, staurolite and biotite.

Gedrite was first described for an occurrence in Gedres, France in 1836.

References


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Look at other dictionaries:

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  • gedrite — noun A form of anthophyllite …   Wiktionary

  • gedrite — ged·rite …   English syllables

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