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K-feldspar tutorial Optical mineralogy
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Several videos of K-feldspar in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: Relief very slightly lower than quartz (subtle), clear in plane-polarized light, with no pleochroism, low interference colors (white), tartan twinning (microcline), perthite (albite exsolution), carlsbad twinning (sanidine), clay alteration (brown "staining").
00:00 Typical microcline with tartan twinning
00:30 More tartan twinning
01:00 Slightly perthitic
01:31 Strongly perthitic, clay alteration
02:01 Beautiful perthite, clay alteration
02:31 Sanidine
Key characteristics: Relief very slightly lower than quartz (subtle), clear in plane-polarized light, with no pleochroism, low interference colors (white), tartan twinning (microcline), perthite (albite exsolution), carlsbad twinning (sanidine), clay alteration (brown "staining").
00:00 Typical microcline with tartan twinning
00:30 More tartan twinning
01:00 Slightly perthitic
01:31 Strongly perthitic, clay alteration
02:01 Beautiful perthite, clay alteration
02:31 Sanidine
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