Comment: 11:54 - 12:22 (00:28)
Source: Annenberg/CPB Resources - Earth Revealed - 12. Minerals: The Materials of Earth
Keywords: "James Sadd", luster, feldspar, muscovite, galena, pyrite, "metallic mineral", "physical property", "mineral identification", mineral
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Our transcription: The way in which of the minerals reflect light is the physical property called "luster".
Feldspar has a dull luster.
It doesn't shine at all. But compare that to muscovite, which has a glassy luster.
Metallic minerals likes galena reflect light like a polished metal surface.
Pyrite also has a metallic luster but is a different color than galena.
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Geology School Keywords
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