Metamorphic Minerals

• Actinolite
• Alurgite
• Andalusite
• Andalusite (chiastolite)
• Antigorite
• Anthophyllite-Gedrite
• Biotite
• Brucite
• Calcite
• Cassiterite
• Charoite
• Chlorite
• Chloritoid
• Chrysocolla
• Cordierite
• Corundum
• Corundum (ruby)
• Kyanite
• Kornerupine
• Kyanite (reticite)
• Deerite
• Dumortierite
• Epidotes
Allanite
Pistacite
Piemontite
Zoisite

• Fassaite
• Fluorite
• Glaucophane
• Garnet
• Hercynite
• Hedenbergite
• Hydrogrossular
• Howieite
• Humites
• Jadeite
• Lawsonite
• Lazulite
• Lazurite
• Malachite
• Minnesotaite
• Muscovite
• Olivine
• Omphacite
• Omphacite Cr
• Pargasite
• Piemontite (Praborna)
• Pyrite
• Prehnite
• Pumpellyite
• Quartz
• Rhodonite
• Rutile
• Sapphirine
• Scapolite
• Serpentine
• Sillimanite
• Sillimanite (fibrolite)
• Staurolite
• Stilpnomelane
• Sugilite
• Talc
• Taramellite
• Thulite
• Tinaksite
• Tinzenite
• Titanite
• Tremolite
• Tourmaline
• Vesuvianite
• Violan
• Wollastonite
• Yoderite
• Zussmanite

Texture and Microstructure

• Augen
• Book shelf sliding
• Boudinage
• Corona
• Decussate
• Deformation lamellae
• Deformation twins
• Crenulation cleavage
• Fringes
• Granoblastic
• Kelyphite
• Kink Bands
• Lepidoblastic
• Mesh
• Mica fish
• Mylonitic
• Nematoblastic
• Oblique foliations
• Polygonal
• Porphyroblastic
• Porphyroclastic
• Pseudomorph
• Ribbon
• S-C fabric
• Skeletal garnet
• Symplectite
• Veins

Metamorphic Rocks

• Albite greenshist
• Amphibolite (felsic)
• Amphibolite (mafic)
• Amphibolite (mylonitic)
• Amphibolite with epidote
• Andalusite schist
• Anyolite
• Augen gneiss
• Blueschist
• Blueschist (Ile de Groix)
• Blueschist (retrograde)
• Buchite
• Calc-schists
• Carbonated peridotite
• Cataclasite
• Charoitite
• Chlorite schist
• Chloritoid Schist (Ile de Groix)
• Cordierite slate
• Corundum-fuchsite rock
• Deformed oolite
• Dunite (mylonitic)
• Eclogite
• Eclogite Porto Ottiolu
• Epidosite
• Gabbro (mylonitic)
• Garnet micaschist
• Glaucophane granofels
• Granite (mylonitic)
• Granulite (felsic)
• Granulite (mafic)
• Granulite (retrograde)
• Granulite (sapphirine-bearing)
• Greenschist
• Hornfels
• Hornfels (albite-epidote)
• Hornfels (cordierite, plagioclase)
• Hornfels (corundum, plagioclase)
• Hornfels (hydrogarnet)
• Jadeite metagranite
• Jadeitite
• Kinzigite
• Lapis lazuli
• Marble
• Marble (calc-silicate)
• Marble (diopside)
• Marble (forsterite)
• Marble (mylonitic)
• Marble (tremolite)
• Mylonite
• Ocean jasper
• Ophicalcite
• Peridotite (mylonitic)
• Phyllite
• Prasinite
• Pseudotachylyte
• Pseudotachylyte (Ivrea-Verbano)
• Quartzite
• Quartzite (tourmaline)
• Rhyolite (mylonitic)
• Rodingite
• Schist
• Seafloor basalt
• Serpentinite
• Serpentinized lherzolite
• Skarn
• Skiddaw Metamorphic Aureole
Skiddaw
1) Spotted slate
2) Andalusite slate
3) Cordierite slate

• Slate
• Slate (ottrelite)
• Talc schist
• Tourmalinite
• Ultramylonite (granitic)
• Ultramylonite (mafic)

Chrome-Omphacite - (Ca,Na)(Mg,Cr³⁺,Al)Si₂O₆

Chrome-Omphacite is the chrome-rich variety of omphacite. It was described from the Eclogite outcrops located near Silberbach, about 3.5 km SE of Konradsreuth and 8 km WSW of Oberkotzau (Bavaria, Germany).



Optical properties

• Form: Usually as coarse anhedral crystals
• Color: Colorless to pale green
• Relief: Moderate
• Interference colors: II order

Silberbach Eclogite. Omphacite (green) e garnet (red-pink). From e-rocks.

Silberbach Eclogite. Omphacite (green) e garnet (red-pink). From e-rocks.

Sample doned by Stefan Mager

Bibliography

• Bucher, K., & Grapes, R. (2011). Petrogenesis of metamorphic rocks. Springer Science & Business Media.
• Fossen, H. (2016). Structural geology. Cambridge University Press.
• Howie, R. A., Zussman, J., & Deer, W. (1992). An introduction to the rock-forming minerals (p. 696). Longman.
• Passchier, Cees W., Trouw, Rudolph A. J: Microtectonics (2005).
• Philpotts, A., & Ague, J. (2009). Principles of igneous and metamorphic petrology. Cambridge University Press.
• Shelley, D. (1993). Igneous and metamorphic rocks under the microscope: classification, textures, microstructures and mineral preferred-orientations.
• Vernon, R. H. & Clarke, G. L. (2008): Principles of Metamorphic Petrology. Cambridge University Press.
• Vernon, R. H. (2018). A practical guide to rock microstructure. Cambridge university press.

Photo

Cr-omphacite, garnet and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 1x (Field of view = 9mm)	Cr-omphacite (high interference colors), garnet (isotropic) and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 1x (Field of view = 9mm)	Cr-omphacite and garnet crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 1x (Field of view = 9mm)
Cr-omphacite (high interference colors) and garnet (isotropic) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 1x (Field of view = 9mm)	Cr-omphacite and garnet crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 1x (Field of view = 9mm)	Cr-omphacite (high interference colors) and garnet (isotropic) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 1x (Field of view = 9mm)
Cr-omphacite, garnet and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 1x (Field of view = 9mm)	Cr-omphacite (high interference colors), garnet (isotropic) and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 1x (Field of view = 9mm)	Cr-omphacite (high interference colors), garnet (isotropic) and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 1x (Field of view = 9mm)
Cr-omphacite, garnet and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)	Cr-omphacite, garnet and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)	Cr-omphacite and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)
Cr-omphacite (high interference colors) and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)	Cr-omphacite, garnet and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)	Cr-omphacite (high interference colors), garnet (isotropic) and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)
Cr-omphacite, garnet and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)	Cr-omphacite (high interference colors), garnet (isotropic) and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)	Cr-omphacite, garnet and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)
Cr-omphacite, garnet, kyanite (Ky label) and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)	Cr-omphacite (high interference colors), garnet (isotropic), kyanite and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)	Cr-omphacite (high interference colors), garnet (isotropic) and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)
Cr-omphacite (high interference colors), garnet (isotropic) and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)	Cr-omphacite, garnet, kyanite (Ky label) and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)	Cr-omphacite (high interference colors), garnet (isotropic), kyanite and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)
Cr-omphacite and garnet crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)	Cr-omphacite (high interference colors) and garnet (isotropic) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)	Cr-omphacite crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)
Cr-omphacite (high interference colors) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)	Cr-omphacite crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)	Cr-omphacite (high interference colors) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)
Cr-omphacite, garnet, kyanite (Ky label) and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)	Cr-omphacite (high interference colors), garnet (isotropic), kyanite and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)	Cr-omphacite, garnet, kyanite (Ky label) and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)
Cr-omphacite (high interference colors), garnet (isotropic) and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)	Cr-omphacite, garnet, kyanite (Ky label) and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)	Cr-omphacite (high interference colors), garnet (isotropic), kyanite and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)
Cr-omphacite, garnet, kyanite (Ky label) and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)	Cr-omphacite (high interference colors), garnet (isotropic), kyanite and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)	Cr-omphacite, garnet, kyanite (Ky label) and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 2x (Field of view = 7mm)
Cr-omphacite (high interference colors), garnet (isotropic), kyanite and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 2x (Field of view = 7mm)	Cr-omphacite and rutile (brown) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 10x (Field of view = 2mm)	Cr-omphacite and rutile crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 10x (Field of view = 2mm)
Cr-omphacite and rutile (brown) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 10x (Field of view = 2mm)	Cr-omphacite and rutile crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 10x (Field of view = 2mm)	Cr-omphacite and rutile (brown) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 10x (Field of view = 2mm)
Cr-omphacite and kyanite (Ky label) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 10x (Field of view = 2mm)	Cr-omphacite and kyanite crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 10x (Field of view = 2mm)	Cr-omphacite, rutile and kyanite (Ky label) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 10x (Field of view = 2mm)
Cr-omphacite and quartz (colorless) crystlas in an eclogite from Silberbach (Bavaria, Germany). PPL image, 10x (Field of view = 2mm)	Cr-omphacite and quartz (I order gray) crystlas in an eclogite from Silberbach (Bavaria, Germany). XPL image, 10x (Field of view = 2mm)