metamorphic
Eclogite
Eclogite (Omphacite + Pyrope)
Hardness: 6.5-7.5. Color: Greenish-grey matrix with dark spots (likely pyroxene or garnet). Luster: Dull to vitreous when polished. Structure: Granular, massive. Specific gravity: 3.2-3.6.
- Hardness
- 6
- Luster
- Dull to vitreous when polished
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Physical properties
Hardness: 6.5-7.5. Color: Greenish-grey matrix with dark spots (likely pyroxene or garnet). Luster: Dull to vitreous when polished. Structure: Granular, massive. Specific gravity: 3.2-3.6.
Formation & geological history
Formed under extremely high pressure and moderate to high temperatures, typically in the Earth's mantle or deep crust during subduction of oceanic crust.
Uses & applications
Primarily used as a decorative stone, in lapidary work (towers and spheres), and as a valuable specimen for geological study of the mantle.
Geological facts
Eclogite is often called the 'Christmas Rock' when red garnet and green omphacite are vibrant. It is a key indicator of high-pressure metamorphic facies.
Field identification & locations
Identify by its high density and characteristic mineral assembly of green pyroxene and red/brown garnets. Found in metamorphic terranes like the Alps and Norway.
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