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USGS CMG InfoBank: Muscovite and Feldspar

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Comment: 10:24 - 10:57 (00:33)
Source: Annenberg/CPB Resources - Earth Revealed - 12. Minerals: The Materials of Earth
Keywords: "James Sadd", muscovite, feldspar, cleavage, "crystal structure", "physical property", "mineral identification", mineral, color

Our transcription: Look at this silver mineral called "muscovite".
It looks almost like a stack of paper with the individual sheets flaking apart quite easily.
The tendency of minerals to break along flat planes is called "cleavage", and cleavage is a property that's determined by the crystalline structure of the mineral.
This pink mineral is "feldspar".
Unlike muscovite, it has cleavage, but there are two directions of cleavage about 90 degrees to one another.

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Page Last Modified: Thu Oct 31 04:26:27 PDT 2013  (chd)