bytownite การใช้

• The specific gravity of bytownite varies between 2.74 and 2.75.
• The feldspar ranges from bytownite to oligoclase, being usually a variety of labradorite; orthoclase is scarce.
• The calcium rich plagioclase feldspar ( labradorite-bytownite ) and pyroxene content vary between 10 %-90 % in gabbro.
• Eucrite is also a now obsolete term for bytownite-gabbro, an igneous rock formed in the Earth's Scotland.
• In the mafic rocks labradorite, anorthite and bytownite prevail, being rich in lime and poor in silica, potash and soda.
• For example, the plagioclase feldspars comprise a continuous series from sodium-rich end member albite ( NaAlSi 3 O 8 ) to calcium-rich anorthite ( CaAl 2 Si 2 O 8 ) with four recognized intermediate varieties between them ( given in order from sodium-to calcium-rich ) : oligoclase, andesine, labradorite, and bytownite.