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{%type%} Definitions

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n. - Rare plagioclastic feldspar occurring in many igneous rocks.

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Usage examples (5)
  • Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt.
  • In chemical composition and in optical and other physical characters it is thus much nearer to the anorthite end of the series than to albite.
  • The name was afterwards applied by G. Tschermak to those plagioclase felspars which lie between labradorite and anorthite; and this has been generally adopted by...
  • The minerals anorthite, albite, and orthoclase named in this figure are all feldspars; sylvite and halite are chlorides of potash and soda.
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