metamorphic
Eclogite with Garnet
Eclogite (Omphacite-Garnet Metamorphic Rock)
Deep pink to red Almandine-Pyrope garnets set in a dark grey-green matrix of omphacite pyroxene. Hardness: 6.5-7.5 (garnets). Luster: Vitreous to dull. Specific Gravity: 3.2-3.6.
- Hardness
- 6
- Luster
- Vitreous to dull
Identified More metamorphic →
Explore Eclogite with Garnet in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Deep pink to red Almandine-Pyrope garnets set in a dark grey-green matrix of omphacite pyroxene. Hardness: 6.5-7.5 (garnets). Luster: Vitreous to dull. Specific Gravity: 3.2-3.6.
Formation & geological history
Formed under extreme high-pressure and high-temperature conditions in the Earth's mantle or during deep subduction of oceanic crust. Typical ages range from Proterozoic to Cenozoic depending on the tectonic belt.
Uses & applications
Primarily a geological specimen for collectors and scientific study of plate tectonics; occasionally used as a decorative stone or abrasive garnet source.
Geological facts
Eclogite is often referred to as the 'Christmas Rock' when the matrix is bright green (omphacite) and the garnets are red. It represents some of the densest rocks found in the Earth's crust.
Field identification & locations
Identified by the distinct contrast of red/pink rounded garnet phenocrysts against a dense, dark silicate matrix. Found in subduction zones like the Alps, Norway, or the Franciscan Complex in California.
More like this
