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:

  • gedrite — ˈjeˌdrīt noun ( s) Etymology: French gédrite, from Gèdre, village in southern France + French ite : a mineral consisting of an aluminous variety of anthophyllite * * * gedrite Min. (ˈdʒɛdraɪt) [a. F. gédrite f. Gèdre (see bel …   Useful english dictionary

  • gedrite — noun A form of anthophyllite …   Wiktionary

  • gedrite — ged·rite …   English syllables

  • List of minerals F-J (complete) — It is currently not possible to have a complete list of minerals . The International Mineralogical Association is the international group that recognises new minerals and new mineral names, however minerals discovered before 1959 did not go… …   Wikipedia

  • Nuumit — Nuumit, auch Nuummit, ist ein seltenes metamorphes Gestein, das vor allem aus den Mineralen Gedrit und Anthophyllit besteht. Der Name leitet sich von dem Fundort Nuuk in Grönland ab. Inhaltsverzeichnis 1 Gestein 2 Vorkommen 3 Literatur 4 E …   Deutsch Wikipedia

  • Nuummit — Nuumit, auch Nuummit, ist ein seltenes metamorphes Gestein, das vor allem aus den Mineralen Gedrit und Anthophyllit besteht. Der Name leitet sich von dem Fundort Nuuk in Grönland ab.[1] Inhaltsverzeichnis 1 Gestein 2 Vorkommen 3 …   Deutsch Wikipedia

  • Anthophyllite — Anthophyllite[1] Catégorie IX : silicates[2] …   Wikipédia en Français

  • Kyanite — General Category Silicate mineral Chemical formula Al2SiO5 …   Wikipedia

  • Amphibole — (pronounced amfi bowl) defines an important group of generally dark colored rock forming inosilicate minerals, composed of double chain SiO4 tetrahedra, linked at the vertices and generally containing ions of iron and/or magnesium in their… …   Wikipedia

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