metamorphic
Eclogite
Eclogite (Omphacite-Garnet rock)
Hardness: 6-7 Mohs; Color: Mottled green (omphacite) and red/pink (garnet); Luster: Vitreous to dull; Crystal structure: Granoblastic; Specific gravity: 3.2-3.6 (very dense)
- Hardness
- 6-7 Mohs
- Color
- Mottled green (omphacite) and red/pink (garnet)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled green (omphacite) and red/pink (garnet); Luster: Vitreous to dull; Crystal structure: Granoblastic; Specific gravity: 3.2-3.6 (very dense)
Formation & geological history
Formed under high-pressure, high-temperature conditions in the Earth's mantle or deep crustal subduction zones. Typically represents metamorphosed oceanic basalt.
Uses & applications
Primarily of interest to research geologists and mineral collectors. Can be used as a decorative stone or abrasive due to garnet content.
Geological facts
Eclogite is often referred to as the 'Christmas Tree Rock' because of its festive green and red appearance. It is one of the densest silicate rocks on Earth.
Field identification & locations
Identify by its high density and characteristic mixture of green pyroxene and red garnet. Commonly found in areas of uplifted metamorphic terranes like the Alps, Norway, or California.
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