Bertrandite Cabochon ( Tiffany Stone, Opal Fluorite), 15x21x5mm (b4481)
Bertrandite Designer Cabochon
Colors: Mixed Lavender and purple tones.
Characteristics: Best polish all sides, flat back, freeform shape, scarce material. Also called Opal Fluorite and Tiffany Stone.
A major ore of Bertrandite is beryllium, and the major deposits of beryllium in the United States are in the Spor Mountains of Utah. Minning began in the 1960's. Until recently this material was not available to the general public because the value of beryllium was high. It is also know as Opal Fluorite orTiffany stone.
Approx size: 15 x 21 x 5 mm, weight: 16 ct.
The 10 mm grid and 18 mm dime in the pictures should help in sizing, 25 mm is equal to 1 inch.
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