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Some feldspar crystals can be quite lustrous, like albite, but many, like microcline, are on the dull side.

Feldspar cleaves well, into flat planes which can be quite lustrous, and will indeed reflect sunlight.

It takes a nice polish, which will reflect even more light.

Some varieties of feldspar, like moonstone or labradorite, interfere with the light, and display spectacular play of color.

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13y ago

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