Hackmanite Cabochon Oval: Tenebrescent Color Change; Large, Untreated; 15+ cts

Description

Hackmanite is a rare form of the gemstone sodalite with an unusual property: it changes color upon exposure to sunlight. An interesting and very rare effect exhibited by only a few gem materials, this is called tenebrescence and is an actual change of color, not dependent on the the colors of the light source (as with almost all "color change" materials). Hackmanite makes for an intriguing and unusual gemstone. This piece changes from an almost colorless gray and white to an intense rose (more intense in stronger sunlight than my quick pictures show). This piece has a speckled pattern that adds scenic interest apart from the color change phenomenon.
Photos were taken under natural sunlight. Item comes in the acrylic gem box as shown.
Approx. Size:
29.5 x 17.9 x 3.6 mm
Approx. Weight:
15.5 cts
Shape/Cut:
oval/cabochon
Origin:
Mogok Valley, Pin-Oo-Lwin, Mandalay (Burma)
Known treatment(s):
none
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