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||Gypsum (twinned) - $10
Lake Gilles Gypsum Deposit, Corunna Station, Iron Knob, Middleback Range, Eyre Peninsula, South Australia, Australia
Miniature - 5.4 x 4.5 x 4.2 cm
Specimen status: Available Send an email with specimen number to order
The Lake Gilles deposit is famous for producing interesting, sharply-formed gypsum crystals, many of which are twinned. This example is typical: well formed, translucent to mostly transparent, and twinned. Penetration twinning forms the X-shape, and twinning along one face causes the football shape. The specimen is more colorless and less brown than my lousy photos suggest. Under shortwave UV the crystal tips show a bluish fluorescence, and when the UV is extinguished, the blue takes a second or two to fade (i.e., the gypsum is phosphorescent). A few very small nicks and rubs are noted, but overall condition is quite nice for such as soft mineral.