santorinite
santorinite
[san′tȯr·ə‚nīt] (petrology)
A light-colored extrusive rock containing approximately 60-65% silica and calcic plagioclase (labradorite to anorthite) as the only feldspar.
A hypersthene andesite containing plagioclase crystals that have labradorite cores and sodic rims and a groundmass with microlites of sodic oligoclase.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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