J.C. REVY, ISM / SCIENCE PHOTO LIBRARY J.C. REVY, ISM / SCIENCE PHOTO LIBRARY
An iridescent slab of labradorite (sodium calcium aluminium silicate), one of the plagioclase series of minerals, which includes albite, oligoclase and anorthite. The plagioclases form an isomorphous series, having the same basic composition and crystal structure, but containing varying proportions of sodium and calcium. Labradorite occurs in both metamorphic and igneous rocks and is found in Labrador (Canada), Norway and the USSR.
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