A low Temperature Eclogite

In a fine aggregate of millimetre-sized crystals, one can recognise red garnet, green omphacite, marine blue glaucophane; green-yellow epidote, white quartz. This is the typical paragenesis of a low temperature eclogite ...
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... viewed under the microscope : garnet (Gt), green, sodic clinopyroxene (omphacite ; Cpx) glaucophane, a blue, sodic amphibole (Glc), epidote (Ep) and quartz (Q). The association Gt + Cpx(sodic) is the typical association of an eclogite, a metamorphic rock formed at high pressure. The minerals galucophane and epidote allow the rock to be accurately placed within the broad eclogite facies domain of the PT diagram (point 5 on the Path ). Microphotography in plane- (PPL) polarized light.

Here below in cross- polarized light :

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See additional macroscopic samples here.

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