37322: Gypsum - $14 Plowed field near Ygnacio Valley Road, Clayton, Walnut Creek, Contra Costa County, California Small cabinet - 8.6 x 6.0 x 5.4 cm 180 grams Fluorescent (LW/SW) Specimen status: Available Send an email with specimen number to order A polycrystalline, opaque gypsum
crystal cluster, having the typical form of gypsum
crystals formed in soil. Highly transparent interior
visible where the specimen is cleaved. Unusual locality.
The cleaved area shows modest fluorescence under both
longwave and shortwave UV. Overall condition is quite
nice, especially given gypsum's softness (2 on the Mohs
scale) and how it was brought to the surface (a plow!).
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