Steven Dutch, Professor Emeritus, Natural and Applied Sciences, University of Wisconsin - Green Bay
A plane-polarized view of stilpnomelane. Although similar in many ways to biotite, it lacks mottling and is never greenish in color.
The same field in crossed polarizers. The dark colors are not anomalous interference colors but are due to the very dark brown color of much of the stilpnomelane.
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Created 16 December 1999, Last Update