| 15btrme ((OPTICAL GYPSUM)), $5 MINIMUM BID, Morocco, 8 x 3 x 2 cm, Cabinet | |
_small.jpg) | Terrible photo. Specimen of optical Gypsum aka Satin Spar which is a substitute for the Ulexite known as TV Rock. Both show the fiber optic characteristic bringing the image up to the top surface of a polished specimen. |
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