Roger Weller, geology instructor
email@example.com copyright 2016-R.Weller
Labradorite is a plagioclase feldspar with a composition ranging from 50% to 70%
albite feldspar (the sodium end member of the plagioclase family) and 50% to 70%
anorthite (the calcium end member). One of the special identifying characteristics
of labradorite is a spectacular display of colors when the mineral is viewed at certain
angles; this property is referred to as "schiller". Schiller is largely due to the
interference of light caused by the reflection from thin lamellar inclusions of various
minerals. Blue and green are the most common colors, but red, yellow, and
gray are also common.
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Just credit photo to R.Weller/Cochise College.