geology : Chloritoid

Jun 30th, 2015
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1. monoclinic/triclinic (-/ +) 2. Relief - moderate 3. Colour - yellow- grey-green - slate blue - indigo 4. RI - 1.705-1.740 Birefringence - 0.005-0.022 5. Interference colours - 1st order, frequently anomalous 6. Comments - often shows multiple twinning

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Chloritoidmonoclinic/triclinic (-/ +)Relief - moderateColour - yellow- grey-green - slate blue - indigoRI - 1.705-1.740Birefringence - 0.005-0.022Interference colours - 1st order, frequently anomalousComments - often shows multiple twinningCrystals of chloritoid showing extremes of pleochroismPPLArna Unit, Argos, GreeceThe field of view above. This crystal shows multiple twins and slightly anomalous interference colours.XPLArna Unit, Argos, Greecealigned, bladed crystals of chloritoidPPLArna Unit, Argos, GreeceAligned, bladed crystals of chloritoid. The same field of view as above.XPLArna Unit, Argos, Greecesubhedral crystal of chloritoid, rotated to show pleochroismPPLArna Unit, Argos, GreeceThe chloritoid crystal shown above under crossed-polarsXPLArna Unit, Argos, Greece

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