Hornblende tutorial Optical mineralogy

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Several videos of hornblende in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: moderate relief, amphibole (60°-120°) cleavage, blue-green-brown pleochroism, low interference colors.
00:00​ Typical plutonic
00:30 Granulite-facies, end section
01:01 Plutonic, zoned (pale green to brown pleochroic)
01:32 Typical metamorphic (green to blue-green pleochroic)
02:02 Garden-variety amphibolite
02:33 Mg-rich (pale pleochroic)
03:04 Pale blue-green pleochroic
  1. Matt Kohn
  2. Optical petrography
  3. mineralogy
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Комментарии
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I love it, I would of thought it was cpx with the incline distinction.

virgo
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Really helpful. Keep up the good work. A small suggestion tho. Can you please put a cursor at the mineral of interest. Will be really helpful for beginners

dingdonga_
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Hi, Thanks for the tutorial. It is very easy to follow. May I please ask what the name of the honey-brown mineral to close to the amphibole at 1.0 minute? It the same colour under PPL and XPL.

boikanyomotloba
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Hello,

Thanks for your video, It is very helpful. My question is, Is it actually inclined extinction because I see parallel or symmetrical extinction.

unk
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Good morning
All your thin sections have equal thickness?
And how is this thickness?
I ask incl. because I'm wondering why yours hornblendes one time have yellow colours and other time blue colours?

jozefj