Steven Dutch, Natural and Applied Sciences, University
of Wisconsin - Green Bay
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- Low relief
- Perfect micaceous cleavage
- Bright second-and third-order interference colors
- Essentially indistinguishable from muscovite
- Best clue to identity is occurrence: talc is most likely to occur in calc-silicate and
other magnesium-rich rocks. The sketch above shows a groundmass of calcite and quartz.
Below is a mass of chlorite and talc. The talc is visible in plane polarized
light by a slight color difference, perhaps due to a tiny amount of iron.
In crossed polars the chlorite has very low interference colors while the
talc has bright second order colors.
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Created 16 December 1999, Last Update
14 Dec 2009
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