metamorphic
Eclogite
Eclogite (Omphacite-Garnet rock)
Hardness: 6.5-7.5 (Mohs), Color: Mottled green and pink/red, Luster: Vitreous to dull, Crystal Structure: Equigranular/granular, Specific Gravity: 3.2-3.6
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.5 (Mohs), Color: Mottled green and pink/red, Luster: Vitreous to dull, Crystal Structure: Equigranular/granular, Specific Gravity: 3.2-3.6
Formation & geological history
Formed under high-pressure, high-temperature conditions in the Earth's mantle or deep subduction zones. Typically represents metamorphosed basaltic crust.
Uses & applications
Primarily used for geological research regarding plate tectonics and mantle composition; occasionally used as a decorative stone or for heavy-duty construction aggregate.
Geological facts
Eclogite is often referred to as the 'Christmas Rock' because of its bright green and red coloration. It provides some of the best evidence for deep subduction processes.
Field identification & locations
Identify in the field by looking for a characteristic 'salt and pepper' or mottled appearance of green pyroxene (omphacite) and reddish-pink garnet. Commonly found in orogenic belts (mountains) like the Alps or Norway.
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