Steven Dutch, Natural and Applied Sciences, University
of Wisconsin - Green Bay
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- Low relief
- No cleavage
- Usually free of inclusions
- Gray to white interference colors, sometimes to light yellowish white
- Undulose extinction common, often with a fan-like pattern (A)
- Grains with highest interference color sometimes look yellowish-brown near extinction
Quartz, the feldspars, cordierite and nepheline all have low relief and gray to white
interference colors. Beginners find them hard to tell apart. View
Quartz and its Look-Alikes.
A view of quartz in crossed polarizers. The undulose extinction and segmentation into
domains of slightly different optical orientation are well seen here.
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Created 22 Sept 1997, Last Update 16 December, 1999
Not an official UW Green Bay site