Chlorite Group Minerals

Jun 30th, 2015
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1. monoclinic (Fe-rich -; Mg-rich +) 2. Relief - low 3. Colour - colourless - pale green - green 4. RI - 1.57-1.69 5. Birefringence - 0.00-0.02 6. Interference colours - 1st order, frequently anomalous

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Chlorite Group Mineralsmonoclinic (Fe-rich -; Mg-rich +)Relief - lowColour - colourless - pale green - greenRI - 1.57-1.69Birefringence - 0.00-0.02Interference colours - 1st order, frequently anomalousbright green, strongly coloured chlorite, here as an alteration of garnet is a blueschist (with sphene, glaucophane and epidote)PPLSkyros, GreeceTopotactic alteration of biotite to chlorite.PPLThe grain above. Anomalous 'Berlin blue' interference colours indicate an iron-rich chlorite.XPLRadiating crystals of chlorite, showing some colour zoning.PPLThe crystals above under crossed polars, showing anomalous blue and violet interference colours.PPLBiotite altering to chlorite, with a subhedral crystal of sphene (centre)PPLThe field of view above under crossed polars. The anomalous brown colours of the chlorite indicate a magnesium-rich variety.PPL

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