a calcium-rich plagioclase
most often found in igneous rocks like basalt, andesite, gabbro and
anorthosite. Labradorite also occurs in gneiss produced
metamorphism of Labradorite-bearing rocks, and in sedimentary rocks
derived from the weathering of other rocks that contained Labradorite.
is well known for displaying the Schiller
effect, a strong play of iridescent blue, green, red,
orange, and yellow colors. This quality, called labradorescence,
results when light strikes a twinning surface within the stone and
reflects from it. Different twinning surfaces within the stone reflect
different colors of light, giving the stone a multi-colored appearance.
is named after the Canadian province in which it was discovered in
1770, on Paul Island near the town of Nain, Labrador. Today it's found
in various localities throughout the world; the smooth, polished
Labradorite specimens on this page come from Madagascar.
(All of them display labradorescence, although some photos capture it
better than others.)
Hold a rainbow in your hand!