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photochromic / tenebrescent (changes to a deeper shade when exposed to sunlight or certain other light sources)
Size: 40 x 27 x 21 mm
Size: 128 x 40 x 8 mm
It was developed by Peter Johns at Middlesex University in 1990
A complex set of geologic conditions brought these minerals together to form this beautiful rock
Botryoidal Prehnite Specimen with Epidote, Kayes Region, Mali sterling silver pendant photochromic / tenebrescent (changes toLight green yellow botryoidal prehnite with minor dark green epidote. Size: 45 x 30 x 27 mm. 50 grams. Locale: Kayes Region, Mali
US$ 127.50
US$ 115.60
US$ 119.99
