metamorphic
Eclogite
Eclogite (Omphacite-Garnet Metamorphic Rock)
Hardness: 6.5-7.5. Color: Green (omphacite) with red to pink spots (garnet). Luster: Vitreous to dull. Structure: Massive, granular. Specific gravity: 3.2-3.6.
- Hardness
- 6
- Color
- Green (omphacite) with red to pink spots (garnet)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7.5. Color: Green (omphacite) with red to pink spots (garnet). Luster: Vitreous to dull. Structure: Massive, granular. Specific gravity: 3.2-3.6.
Formation & geological history
Formed at high pressures and temperatures in the mantle or lower crust, typically through subduction of oceanic crust. Originates at depths of 50 km or more.
Uses & applications
Used primarily for geological study of the Earth's mantle, occasionally as a decorative gemstone or industrial abrasive if garnet content is high.
Geological facts
Known as the 'Christmas Rock' due to its festive red and green coloration. It is one of the densest silicate rocks known.
Field identification & locations
Identified by the distinct combination of green pyroxene and red garnet. Found in subduction zones (Alps, Norway, California) and as xenoliths in kimberlite pipes.
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