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Garnet tutorial optical mineralogy
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Several videos of garnet in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: High relief, isotropic, commonly has inclusions, sometimes slightly pink
00:00 Typical single crystal
00:30 Pink garnet from a calc-silicate
01:00 Large crystal included in staurolite
01:30 Fishnet/honeycomb crystal
02:00 Idioblastic crystal
02:30 Graphite inclusions outline growth sectors
03:00 Reacting to form biotite (also monazite)
03:30 Thick section showing weak interference colors
Key characteristics: High relief, isotropic, commonly has inclusions, sometimes slightly pink
00:00 Typical single crystal
00:30 Pink garnet from a calc-silicate
01:00 Large crystal included in staurolite
01:30 Fishnet/honeycomb crystal
02:00 Idioblastic crystal
02:30 Graphite inclusions outline growth sectors
03:00 Reacting to form biotite (also monazite)
03:30 Thick section showing weak interference colors
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0:00:51
0:04:12
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