metamorphic
Eclogite
Eclogite (Omphacite-Garnet Rock)
Hardness: 6.5-7.5. Color: Characteristic green background with red to pink garnet crystals. Luster: Vitreous to dull. Structure: Granular, non-foliated. Specific gravity: 3.2-3.6.
- Hardness
- 6
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7.5. Color: Characteristic green background with red to pink garnet crystals. Luster: Vitreous to dull. Structure: Granular, non-foliated. Specific gravity: 3.2-3.6.
Formation & geological history
Forms under extremely high pressure and high temperature conditions typically found in the Earth's mantle or deep in subduction zones (ultra-high-pressure metamorphism).
Uses & applications
Primarily of scientific interest for understanding plate tectonics. Occasionally used as a decorative stone or as a low-grade gemstone (garnets).
Geological facts
Known as the 'Christmas Rock' because of its striking green and red color combination. It represents the highest grade of metamorphic facies.
Field identification & locations
Identify by the distinct association of red garnet and green omphacite pyroxene. Commonly found in glaciated terrains or mountain belts like the Norwegian Caledonides or the Alps.
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