Bertrandite (aka Opal Fluorite, Tiffany Stone), 2.5 oz, rough slab, natural (rs52092)
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Bertrandite aka Tiffany Stone and Opal Fluorite rough slab
Characteristics: Purple and Lavender tones. Unfinished natural slab, smooth cut. No pits or open fractures., some naturally sealed fractures. Makes beautiful cabs.
A major ore of Bertrandite is beryllium, and the major deposits of beryllium in the United States are in the Spor Mountains of Utah. Brush Wellman, Inc. bought the mineral rights to these deposits and began mining in the 1960's. Until recently this material was not available to the general public because the value of beryllium was high. For some reason it became more abundant in Arizona the last several years. Two types of this material exist, one is the opal fluorite type(tiffany stone) along with an agatized material. This I would call opalized.
Approx size: irregular 3 3/4" x 2 1/2" x 6 mm, Weight: 2.5 oz
First 2 pictures taken wet to bring out colors you may see after polishing. Remaining pictures taken dry to show imperfections if any. If it is transparent the picture is taken with backlighting. I use a full spectrum 45 w light bulb - photography photo CFL 5500K. It is a daylight balanced pure white light. The last picture was taken with natural sunlight.
Slab was preformed by shaping the slab and sanding the front and back with 180 or 320 diamond grit, depends on the hardness.
I use a 24 mm coin and 10 mm squares in my pictures to help with image sizing.
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Finishing your slabs: Want to finish your slabs or create a cab and want to know a little more about that, my internet website Designsbyshirl has several blog posts on how to select rough and create a cabochon.