Genesis of albite in early orogenic volcanic rocks

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Abstract
Evidence based principally on optical properties of albite indicates that many quartz-keratophyres are not metamorphosed rhyolites but are the products of the crystallization of more or less hydrous magmas. The most important criteria for the identification of primary (magmatic, in the broad sense) albite is the quasi-low-temperature optics: 2V z between 90 degrees and 100 degrees , and twin-axis angles (especially Carlsbad) between those of low-temperature and high-temperature albite. Recognition of primary albite has petrologic and tectonic significance.

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