Anthophyllite/gedrite tutorial Optical mineralogy

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Several videos of the orthoamphiboles gedrite and anthophyllite in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: Moderate relief, gray pleochroism (gedrite) or no pleochroism (anthophyllite), 60°-120° cleavage (end sections), parallel extinction, low interference colors.
00:00​ Overview and explanation
00:28​ Typical gedrite
00:59 Acicular (needle-shaped) gedrite
01:29​ Very pale gedrite
02:00​ Maybe anthophyllite
02:30 Definitely anthophyllite
  1. Matt Kohn
  2. Optical petrography
  3. mineralogy
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Great tutorial, Professor Kohn (but the Al-rich end-member is pronounced ˈjeˌdrīt, not ˈgeˌdrīt).

yakovsannikov