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Hornblende tutorial Optical mineralogy
Автор: Matt Kohn
Загружено: 2021-05-04
Просмотров: 16209
Описание:
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
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