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Wikisource has the text of the 1911 Encyclopædia Britannica article Bytownite.
Additional recommended knowledge
Bytownite is a calcium rich member of the plagioclase solid solution series of feldspar minerals. It is usually defined as having "%An" between 70 and 90. Like others of the series, bytownite forms grey to white triclinic crystals commonly exhibiting the typical plagioclase twinning and associated fine striations.
The specific gravity for bytownite varies between 2.74 and 2.75. The refractive indices ranges are nα=1.563 - 1.572, nβ=1.568 - 1.578, and nγ=1.573 - 1.583. Precise determination of these two properties with chemical, X-ray diffraction, or petrographic (birefringence and optic angle) analysis are required for identification.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Bytownite". A list of authors is available in Wikipedia.|