metamorphic
Eclogite
Eclogite (Omphacite-Garnet Rock)
Hardness (6.5-7.5), Color (mottled green, red, and black), Luster (dull to vitreous), Crystal structure (equigranular to porphyroblastic), Specific Gravity (3.2-3.6).
Identified More metamorphic →
Explore Eclogite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness (6.5-7.5), Color (mottled green, red, and black), Luster (dull to vitreous), Crystal structure (equigranular to porphyroblastic), Specific Gravity (3.2-3.6).
Formation & geological history
Formed through high-pressure metamorphism of mafic igneous rocks (usually basalt or gabbro) in subduction zones at depths exceeding 45km. Most are Phanerozoic to Precambrian in age.
Uses & applications
Primarily used for geological research regarding plate tectonics and mantle conditions. Occasionally used as a decorative stone or abrasive due to garnet content.
Geological facts
Known as the 'Christmas Rock' because of its striking green and red coloration. It is one of the densest silicate rocks found in the Earth's crust.
Field identification & locations
Identify by looking for a high-density rock containing red garnets embedded in a green pyroxene (omphacite) matrix. Commonly found in orogenic belts like the Alps or the Norwegian Caledonides.
More like this
