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Tiffany stone is a gemstone. Mineralogically speaking it is primarily comprised of fluorite, the mineral form of calcium fluoride, CaF2. It can have smaller amounts of opal, calcite, dolomite, quartz, chalcedony, bertrandite and trace amounts of other minerals. It does not have its own mineralogical or gemalogical classification given by groups such as the IMA. It is a purple, blue and white rock that is used by lapidary artists to create beads, cabochons and other pieces of interest. It is a soft stone, usually ranging from 5 to 5.5 on the mohs scale.

Tiffany stone is also known as "opal flourite", "opalized flourite", and "ice cream stone". It is sometimes erroneiously referred to as "Bertrandite". The name "Tiffany stone" is not related to "Tiffany and co.". The trade name Tiffany stone was named after the daugher of the mining family who discovered the claim.