Biotite tutorial Optical mineralogy

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Several videos of Biotite in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: Pleochroic in brown/reddish brown, pleochroic haloes, high interference colors, birds' eye extinction
00:00 Typical single crystal showing brown pleochroism
00:30 Pleochroic haloes around accessory mineral inclusions
01:01 Unusual orientation looking down on a cleavage face
01:31 Super well-developed birds' eye extinction
02:02 Red (high-Ti) crystals
02:32 Very pale brown (high-Mg) grain in peridotite
03:03 Very pale brown (high-Mg) crystals in schist
03:33 Greenish (high Fe3+, low-Ti) crystal
04:04 Rotated graphite inclusion trails
  1. Matt Kohn
  2. Optical petrography
  3. mineralogy
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Комментарии
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Thanks a ton for these slides and explanation

shambhavimishra
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Thank you! any tips to recognize secondary biotite? i know crystals are very fine and "spotted" extintion may not occur; but i´ve also observed large biotites aligned as alteration borders in EDM veins, with andalucite, these biotites should be secondary or primary (removilized)?

danielabustamante
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1:57 are those hexagonal intrusions apatite?

ciprianpopa
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Sir also include twinning when you explain

ritishasingh
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Hello Sir thanks for these videos. Can u make video showing water and ice under the microscope?

allanthomas
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Hello Sir, i have a question, if a biotite in basal section, does it have weak pleochoic? like from dark brown to the darker brown.. And could it be have a low 2V angel so the optical sign is looks like uniaxial? Thanks..

dematata