fuckyeahmineralogy: Thin cross-section under cross polarizing lightThese colors are real! Looking at
fuckyeahmineralogy: Thin cross-section under cross polarizing lightThese colors are real! Looking at a section under polarizing light can be used to identify minerals through their index of refraction by matching the vivid colors seen here to a handy-dandy chart. Rotating the specimen can reveal diagnostic features like tartan twinning on the left (microcline) or undulose extinction (quartz). -- source link
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