The specific gravity of bytownite varies between 2.74 and 2.75.
2.
The feldspar ranges from bytownite to oligoclase, being usually a variety of labradorite; orthoclase is scarce.
3.
The calcium rich plagioclase feldspar ( labradorite-bytownite ) and pyroxene content vary between 10 %-90 % in gabbro.
4.
Eucrite is also a now obsolete term for bytownite-gabbro, an igneous rock formed in the Earth's Scotland.
5.
In the mafic rocks labradorite, anorthite and bytownite prevail, being rich in lime and poor in silica, potash and soda.
6.
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.
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