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- Omphacite abstract "Omphacite is a member of the pyroxene group of silicate minerals with formula: (Ca, Na)(Mg, Fe2+, Al)Si2O6. It is a variably deep to pale green or nearly colorless variety of pyroxene. Omphacite compositions are intermediate between calcium-rich augite and sodium-rich jadeite. It crystallizes in the monoclinic system with prismatic, typically twinned forms, though usually anhedral. Its space group (P2/n) is distinct from that of augite and jadeite (C2/c). It exhibits the typical near 90° pyroxene cleavage. It is brittle with specific gravity of 3.29 to 3.39 and a Mohs hardness of 5 to 6.It is a major mineral component of eclogite along with pyrope garnet and also occurs in blueschist facies and UHP (ultrahigh-pressure) metamorphic rocks. It also occurs in eclogite xenoliths from kimberlite as well as in crustal rocks metamorphosed at high pressures. Associated minerals in eclogites include garnet, quartz or coesite, rutile, kyanite, phengite, and lawsonite. Minerals such as glaucophane, lawsonite, titanite, and epidote occur with omphacite in blueschist facies metamorphic rocks. The name "jade," usually referring to rocks made of jadeite, is sometimes also applied to rocks consisting entirely of omphacite. The name "omphacite" has been applied to compositions that contain between 20% and 80% jadeite. The stability of intermediate compositions between augite and jadeite is not well-understood, but miscibility gaps appear to be present at temperatures below 300 °C to 400 °C, and perhaps at higher temperatures. Pairs of pyroxenes -- both augite plus omphacite and omphacite plus jadeite -- appear to have existed in equilibrium at low temperatures.It was first described in 1815 in the Münchberg Metamorphic complex, Franconia, Bavaria, Germany. The name omphacite derives from the Greek omphax or unripe grape for the typical green color.".
- Omphacite wikiPageID "3280954".
- Omphacite wikiPageRevisionID "540664121".
- Omphacite 2v "Measured: 58° to 83°, Calculated: 74° to 88°".
- Omphacite birefringence "δ = 0.023".
- Omphacite category Pyroxene.
- Omphacite cleavage "Good on {110}, {110} ^ {10} ≈87°; parting on {100}".
- Omphacite color "Green to dark green; colorless to pale green in thin section".
- Omphacite dana "65.01".
- Omphacite diaphaneity "Translucent".
- Omphacite formula "Si2O6".
- Omphacite fracture "Uneven to conchoidal".
- Omphacite gravity "3.16".
- Omphacite habit "Rarely in rough crystals; anhedral, granular to massive".
- Omphacite hasPhotoCollection Omphacite.
- Omphacite luster "Vitreous to silky".
- Omphacite mohs "5".
- Omphacite name "Omphacite".
- Omphacite opticalprop "Biaxial".
- Omphacite pleochroism "Weak; X = colorless; Y = very pale green; Z = very pale green, blue-green".
- Omphacite refractive "nα = 1.662 - 1.701 nβ = 1.670 - 1.712 nγ = 1.685 - 1.723".
- Omphacite streak "Greenish white".
- Omphacite strunz "9".
- Omphacite symmetry "Monoclinic 2/m".
- Omphacite system "Monoclinic - Prismatic".
- Omphacite tenacity "Brittle".
- Omphacite twinning "Single and polysynthetic twinning common on {100}".
- Omphacite unitCell "a = 9.66 Å, b = 8.81 Å, c = 5.22 Å; β = 106.56°; Z = 4".
- Omphacite subject Category:Aluminium_minerals.
- Omphacite subject Category:Calcium_minerals.
- Omphacite subject Category:Inosilicates.
- Omphacite subject Category:Iron_minerals.
- Omphacite subject Category:Magnesium_minerals.
- Omphacite subject Category:Sodium_minerals.
- Omphacite type Abstraction100002137.
- Omphacite type AluminiumMinerals.
- Omphacite type CalciumMinerals.
- Omphacite type IronMinerals.
- Omphacite type MagnesiumMinerals.
- Omphacite type Material114580897.
- Omphacite type Matter100020827.
- Omphacite type Mineral114662574.
- Omphacite type Part113809207.
- Omphacite type PhysicalEntity100001930.
- Omphacite type Relation100031921.
- Omphacite type SodiumMinerals.
- Omphacite type Substance100019613.
- Omphacite type ChemicalSubstance.
- Omphacite type Mineral.
- Omphacite type ChemicalObject.
- Omphacite type Thing.
- Omphacite comment "Omphacite is a member of the pyroxene group of silicate minerals with formula: (Ca, Na)(Mg, Fe2+, Al)Si2O6. It is a variably deep to pale green or nearly colorless variety of pyroxene. Omphacite compositions are intermediate between calcium-rich augite and sodium-rich jadeite. It crystallizes in the monoclinic system with prismatic, typically twinned forms, though usually anhedral. Its space group (P2/n) is distinct from that of augite and jadeite (C2/c).".
- Omphacite label "Omfaciet".
- Omphacite label "Omfacite".
- Omphacite label "Omfacyt".
- Omphacite label "Omphacit".
- Omphacite label "Omphacite".
- Omphacite label "Omphacite".
- Omphacite label "Onfacita".
- Omphacite label "Onfacite".
- Omphacite label "オンファス輝石".
- Omphacite sameAs Omphacit.
- Omphacite sameAs Onfacita.
- Omphacite sameAs Omphacite.
- Omphacite sameAs Omfacite.
- Omphacite sameAs オンファス輝石.
- Omphacite sameAs Omfaciet.
- Omphacite sameAs Omfacyt.
- Omphacite sameAs Onfacite.
- Omphacite sameAs m.09321b.
- Omphacite sameAs Q745864.
- Omphacite sameAs Q745864.
- Omphacite sameAs Omphacite.
- Omphacite wasDerivedFrom Omphacite?oldid=540664121.
- Omphacite isPrimaryTopicOf Omphacite.
- Omphacite name "Omphacite".