Omphacite In Thin Section

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Omphacite in thin section. Omphacite is a member of the pyroxene group of silicate minerals with formula. High relief in thin section. The only exception is the sample kv 06 15 figure 19 20a where matrix omphacite is in contact with garnet.

Omphacite crystals are stubby prisms with four or eight sided cross sections. It is less commonly found in alpine metamorphic belts in blue schist metagraywacke and can also be found in. It is a variably deep to pale green or nearly colorless variety of pyroxene.

Inclusions of omphacite in garnet were observed in several thin sections and we restrict our estimates for the peak p t conditions to this and associated assemblages. Good in two directions 110 at right angles to the c axis on 001 the clivage angle in two directions are at nearly right angles 87 and 93. Commonly found in rocks that formed in high pressure conditions such as eclogite a high pressure metamorphic igneous rock.

This optical mineralogy petrography video is part of the video atlas of minerals in thin section library at https www. Omphacite violan in thin section fkm 329 optic axis figure youtube. Also commonly anhedral granular.