metamorphic
Eclogite
Eclogite (Omphacite-Garnet Metamorphic Rock)
Hardness: 6-7 (Mohs); Color: Mottled red (garnet) and green (omphacite pyroxene); Luster: Vitreous to dull; Crystal structure: Coarse-grained granular; Specific gravity: 3.2-3.6 (very dense)
- Hardness
- 6-7 (Mohs)
- Color
- Mottled red (garnet) and green (omphacite pyroxene)
- Luster
- Vitreous to dull
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: 6-7 (Mohs); Color: Mottled red (garnet) and green (omphacite pyroxene); Luster: Vitreous to dull; Crystal structure: Coarse-grained granular; Specific gravity: 3.2-3.6 (very dense)
Formation & geological history
Formed under extreme high-pressure and moderate-to-high temperature conditions in subduction zones or the lower crust/upper mantle. It represents the metamorphism of basaltic rock at depths exceeding 45km.
Uses & applications
Primarily of interest to researchers and collectors; occasionally used as a decorative stone or for heavy-duty construction aggregate due to high density.
Geological facts
Eclogite is often called the 'Christmas Tree Rock' because of its striking red and green coloration. It is a key indicator of deep-seated tectonic processes.
Field identification & locations
Identified by the distinct combination of deep red almandine-pyrope garnets and green omphacite pyroxene. It is unusually heavy for its size. Often found in glaciated regions or specific metamorphic terranes like the Alps or Norway.
More like this
