A purple, lavender, white stone sometimes with patches of mauve, yellowish-brown and black is found in beryllium ore (Bertrandite) . This stone is known as opalite, ice cream opal, opalized fluorite and opal fluorite. The name Tiffany Stone presumably comes from the jewelry company of the same name that used it in some of their designs. Mined in the state of Utah, USA, this is a form of opalized stone that forms in mineralized nodules. It is composed predominantly of dolomite, opalized fluorite but often found with minerals such as quartz and chalcedony.A beautiful stone in varying shades of dark purple, lavender and creamy white with swirls of dark and light yellowish brown and pink areas takes a high polish when cut en cabochon.