Clinopyroxene tutorial Optical mineralogy
Автор: Matt Kohn
Загружено: 2021-05-03
Просмотров: 29962
Several videos of clinopyroxenes in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: High relief, kind of crappy cleavage c. 90°-90°, faint green pleochroism, low to moderate interference colors, inclined extinction
00:00 End section showing two cleavages
00:31 Elongate prism, slight pleochroism, inclined extinction
01:01 Different orientations showing different interference colors
01:32 Different orientations showing slight pleochroism
02:02 Higher relief than adjacent hornblende (and quartz)
02:33 Higher relief than adjacent actinolite (and quartz)
03:03 Omphacite (high-pressure sodic pyroxene) in an eclogite
03:34 Omphacite with exsolution
04:04 High-temperature pyroxene with oxide exsolution
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