mineral

Tiffany Stone

Fluorite Opal (a complex mix of Fluorite, Opal, Calcite, Dolomite, Quartz, and Bertrandite)

AI-generated identification · may be incorrect

Hardness: 4 to 7 (variable due to mineral mix); Color: Purple, lavender, cream, and mustard yellow; Luster: Vitreous to waxy; Crystal structure: Amorphous/Massive; Specific Gravity: 2.1 to 2.6

Hardness: 4 to 7 (variable due to mineral mix)
Color: Purple, lavender, cream, and mustard yellow
Luster: Vitreous to waxy

Identified April 26, 2026More mineral →

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Physical properties

Hardness: 4 to 7 (variable due to mineral mix); Color: Purple, lavender, cream, and mustard yellow; Luster: Vitreous to waxy; Crystal structure: Amorphous/Massive; Specific Gravity: 2.1 to 2.6

Formation & geological history

Formed from volcanic ash deposits and hydrothermal fluids carrying beryllium and fluorine, which mineralized into nodules within limestone host rock. Primarily Cretaceous period in age.

Uses & applications

Predominantly used for lapidary work, making jewelry (cabochons), and as a collector's specimen. Historically mined for beryllium extraction.

Geological facts

Also known as 'Opalized Fluorite' or 'Ice Cream Opal,' it is one of the rarest stones in the world because it is found almost exclusively in one location: the Brush Wellman Beryllium Mine in Utah, USA.

Field identification & locations

Identify by its distinctive purple and yellow 'swirled' pattern and conchoidal fracture. Collectors should look for patterns that resemble stained glass. Collecting at the primary site is strictly restricted.