Tiffany Stone rough preformed slab, Bertrandite and Opal Fluorite (rs71797)
Tiffany Stone, aka Bertrandite, Opal Fluorite rough slab
Characteristics: Red, black, white, yellow. preformed for cabochon or specimen. Opalized. Unique and rare pattern. Unfinished natural slab, no pits or open fractures. Several naturally sealed fracture lines that fit right in with the beauty of the slabs colors. Hardness 7.
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.
Tiffany stone is a rock composed primarily of fluorite with smaller amounts of opal, calcite, dolomite, quartz, chalcedony, bertrandite and other materials. Other names used for Tiffany stone are "opalized fluorite," "ice cream stone," and "Bertrandite."
Approx size: 14 x 48 x 6 mm, Weight: 7.9g (39.5 ct)
First 3 pictures taken wet to bring out colors you may see after polishing. Remaining pictures taken dry to show imperfections if any. If it's transparent one 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.
Unless noted all my rough slabs are preformed and the front and backs sanded with 320 diamond grit.
A 24mm coin and 10 mm squares in my pictures should 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.