metamorphic
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
Hardness: 6.5-7.5 (garnet) and 5-6 (omphacite); Color: Deep red to pink garnets in a green to dark gray matrix; Luster: Vitreous to greasy; Structure: Coarse-grained granular; Specific Gravity: 3.2-3.6
- Hardness
- 6
- Color
- Deep red to pink garnets in a green to dark gray matrix
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 6.5-7.5 (garnet) and 5-6 (omphacite); Color: Deep red to pink garnets in a green to dark gray matrix; Luster: Vitreous to greasy; Structure: Coarse-grained granular; Specific Gravity: 3.2-3.6
Formation & geological history
Formed at extremely high pressures and temperatures in the mantle or lower crust, typically through subduction of basaltic oceanic crust into the Earth's mantle.
Uses & applications
Primarily used as a collector specimen, for geological research, and occasionally as a decorative gemstone or industrial abrasive (garnet content).
Geological facts
Eclogite is often called the 'Christmas Tree Rock' because of its classic red garnet and green omphacite colors. It provides vital clues about the recycling of crustal materials into the mantle.
Field identification & locations
Identify by looking for dense, heavy stones with red circular garnets embedded in a dark, often greenish, pyroxene matrix. Commonly found in mountain belts (orogenic belts) and as xenoliths in kimberlite pipes.
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