Gehlenite, Opal-AN (Var: Hyalite)
Tin Mountain, Goldbelt Mining District, Cottonwood Mountains, Panamint Mts, Inyo County, California, USA
2.6 x 1.8 x 1.7 cm. Exceptionally large for the species, this may very well be the finest gehlenite specimen I have seen, from anywhere. The vitreous luster on the brownish-gold crystal is almost metallic, not unlike what you see in a fine mica. The form on this prismatic crystal is excellent, with striated faces and a very smooth termination, ...
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