Witherite, Cave-In-Rock, Illinois

Witherite is a relatively rare barium carbonate mineral that shows a blue/white fluorescent response under short and long wave UV.  The historical fluorspar (fluorite) mines of Cave-In-Rock, Hardin County, Illinois, have produced specimens of witherite of exceptional quality.  This specimen consists of a mass of large, twinned (pseudohexagonal) crystals of off-white witherite on a minimal matrix of unknown grey material. The witherite shows a similar fluorescent response under all UV wavelengths-  glowing blue/white, slightly warmer under long wave. This specimen also shows green phosphorescence, most brightly following short wave UV.  The size of this piece is 75 x 71 x 49 mm, and it weighs 302 grams.

 Click on the above images for a larger view and wavelength information.

 

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