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Plagioclase tutorial optical mineralogy
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Several videos of plagioclase in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: low relief, colorless, low interference colors (maximum = white), twinning or zoning
00:00 Two grains, one with twins, one without
00:30 Single zoned and twinned grain
01:00 Single grain both twinned and untwinned
01:30 An untwinned grain with twinned grains around it
02:00 Strongly zoned (and twinned)
02:30 Typical plagioclase in a granite
03:00 Bizarre metamorphosed amygdule
03:31 Volcanic interlocking grains
04:01 With melt inclusions
04:31 Albite and pericline twins
Key characteristics: low relief, colorless, low interference colors (maximum = white), twinning or zoning
00:00 Two grains, one with twins, one without
00:30 Single zoned and twinned grain
01:00 Single grain both twinned and untwinned
01:30 An untwinned grain with twinned grains around it
02:00 Strongly zoned (and twinned)
02:30 Typical plagioclase in a granite
03:00 Bizarre metamorphosed amygdule
03:31 Volcanic interlocking grains
04:01 With melt inclusions
04:31 Albite and pericline twins
0:01:29
0:01:57
0:00:12
0:03:02
0:01:02
0:00:18
0:01:32
0:03:45
0:01:33
0:00:17
0:00:51
0:01:32
0:00:11
0:00:23
0:00:41
0:02:32
0:02:05
0:02:02
0:00:34
0:04:44
0:04:45
0:00:11
0:06:32