More on plagioclase feldspar from Fact Monster:

• labradorite - labradorite labradorite , a variety of plagioclase feldspar.
• feldspar - feldspar feldspar or felspar, an abundant group of rock-forming minerals which constitute 60% of ...
• rhyolite - rhyolite rhyolite, fine-grained light-colored acidic volcanic rock. Rhyolite is chemically the ...
• Encyclopedia: Mineralogy and Crystallography - Encyclopeadia articles concerning Mineralogy and Crystallography.

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