Steven Dutch, Natural and Applied Sciences, University
of Wisconsin - Green Bay
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- Very high relief
- Usually clear but may be colored
- When surrounded by biotite or cordierite, often create pleochroic haloes
due to radiation damage.
- Very high (third- or fourth-order) interference colors
Below are some large zircon crystals in plane and crossed polars.
Below is a very typical appearance of small zircons in biotite. Uranium and
thorium substitute for zirconium, and their decay produces radiation damage in
the surrounding material.
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Created 16 December 1999, Last Update
14 Dec 2009
Not an official UW Green Bay site