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Labradorescence

Labradorite, named after the geological type area in Labrador, Canada, is a fmixture of feldspar minerals, generally appearing dark or grey. Viewed and lit under a certain angle, it developes a spectacular schiller effect called labradorescence. The colours range from blue to green through yellow and orange. Some pieces of labradorite display a spectacular play of light across the whole spectrum simultaneously (spectrolites).
Labradorite undergoes a cooling phase during its formation, leading to phase exsolution. The latter produces a layered structure with lamellar intergrowths. Light entereing the mineral is slowed down, refracted and reflected again several times in a complicated process, resulting in interference. If the layers are too thin, too thick or wrongly oriented, no colour play can be seen.

http://en.wikipedia.org/wiki/Labradorite
http://www.galleries.com/minerals/silicate/labrador/labrador.htm


Spectrolite. Tamron SP DI macro lens f=90 mm/1:2.8. Processed with Adobe Photoshop Elements 6.0.


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