Omphacite
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Omphacite is a member of the clinopyroxene group of silicate minerals with formula: Si2O6. It is a variably deep to pale green or nearly colorless variety of clinopyroxene. It normally appears in eclo
Picture of pieces of eclogite (type of rock) from the Western Gneiss Region in Norway. The rock contains the minerals omphacite (green), pyrope-garnet (red), quartz (milky), kyanite (blue) and some phengite (golden white).
Phase diagram of slab crust in the Earth's upper mantle from 200 to 500 km depth. Omphacite general dissolves into garnet as depth increases. Omphacite can stable up to ~500 km depth.
Jadeite
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Jadeite is a pyroxene mineral with composition NaAlSi2O6. It is hard, very tough, and dense, with a specific gravity of about 3.4. It is found in a wide range of colors, but is most often found in sha
Omphacite
…It normally appears in eclogite, which is the high-pressure metamorphic rock of basalt. Omphacite is the solid solution of Fe-bearing diopside and jadeite. It crystallizes in the monoclinic system with prismatic, typically twinned forms, though usually anhedral. Its space group can be P2/n or C2/c depending…
Jadeite from California
Phase diagram for jadeite system
Unusual lavender jade (metaphonolite) from Bursa Province, northwestern Turkey. The color is from jadeite pyroxene.
Jade rock inspection with a portable UV LED flashlight in Mandalay Jade Market.