geology : Glaucophane

Jun 28th, 2015
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1. Relief - moderate 2. Colour - blue - lilac pleochroism 3. RI - 1.594-1.652 4. Birefringence - 0.023-0.020 5. Interference colours - low 2nd order, frequently anomalous

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Glaucophanemonoclinic (glaucophane -)Relief - moderateColour - blue - lilac pleochroismRI - 1.594-1.652Birefringence - 0.023-0.020Interference colours - low 2nd order, frequently anomalousblue-lilac euhedral crystals of glaucophanePPLBlueschist, Anglesey, N. WalesEuhedral porphyroblasts of compositionally zoned glaucophanePPLBlueschist, Siphnos, GreeceEuhedral porphyroblasts of compositionally zoned glaucophane. The field of view above under crossed polars.XPLBlueschist, Siphnos, GreeceGlaucophane, showing extremes of pleochroism. Epidote, sphene and quartz are also present.PPLblueschist, Turkey(P5130)Glaucophane, showing extremes of pleochroism. Calcite, epidote sphene and quartz are also present.PPLblueschist, Turkey(P5130)

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