Hornblende

Jun 28th, 2015
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Amphiboles; Double-chain Silicates 2. Monoclinic (-,+) 3. Relief - moderate 4. Colour - green or brown (oxy-hornblende) 5. RI - 1.61-1.76 6. Birefringence - 0.02 7. Interference colours - 2nd-3rd order, masked by the body colour 8. Extinction - inclined, complete 9. Comments - simple twinning is common

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HornblendeAmphiboles; Double-chain SilicatesMonoclinic (-,+)Relief - moderateColour - green or brown (oxy-hornblende)RI - 1.61-1.76Birefringence - 0.02Interference colours - 2nd-3rd order, masked by the body colourExtinction - inclined, completeComments - simple twinning is commonperfect cleavage in hornblendePPLFish Canyon Tuffsimple twin in hornblendePPLFish Canyon Tuffbasal section of hornblende, showing the twocleavages intersecting at 120/60PPLFish Canyon TuffEuhedral, acicular hornblendePPLvosgesite, AssyntEuhedral, acicular hornblendeXPLvosgesite, Assynteuhedral crystal of hornblende showing pleochroism as the crystal is roataed through 90.This crystal also shows concentric zoning.PPLFish Canyon TuffEuhedral rhombic and acicular crystals of hornblende;the basal section at the top left shows a simple twin.PPLvosgesite, Assyntsimple twinned crystal of hornblendePPLFish Canyon TuffName: HornblendeDescription:Amphiboles; Double-chain Silicates 2. Monoclinic (-,+) 3. Relief - moderate 4. Colour - green or brown (oxy-hornblende)5. RI - 1.61-1.76 6. Birefringence - 0.02 7. Interference colours - 2nd-3rd order, masked by the body colour 8. Extinction - inclined, complete 9. Comments - simple twinning is common

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