Eclogite
Image: James St. John (CC BY 2.0)
Mineral NameEclogite
Chemical FormulaN/A (rock, composed of multiple minerals)
Mohs Hardness5
Lustervitreous
Streak Colorwhite to pale green
Cleavagevariable (good in omphacite, none in garnet)
Fractureuneven to conchoidal
Specific Gravity3.4
Colorsgreen, red, whitish-gray, blue, black
Transparencytranslucent to opaque
Type LocalityAlmenningen, Vestland, Norway
Mineral GroupMetamorphic Rock
Usesscientific research, collector
Associated Mineralsgarnet (pyrope/almandine), omphacite pyroxene, quartz, kyanite, mica, rutile, amphibole
Rarityuncommon
Description
This is an attractive, crystalline-textured, very high-grade metamorphic rock, primarily composed of reddish garnet and green omphacite pyroxene.
Geological Context
Eclogites are high-pressure, high-temperature metamorphic rocks that form in the Earth's mantle or from subducted oceanic crust, representing extreme metamorphic conditions.
