Faceted Fluorite, 11.87 carats, Rogerly Mine England. Natural fluorite mineral has ornamental and lapidary uses. It is also used for ornamental carvings. Fluorite was first described in 1530 and was originally referred to as 'fluorspar'.
Phosphophyllite is a mineralogical rarity so highly prized by mineral enthusiasts that very few faceted examples are ever produced, leading to some collectors considering a faceted gem to be the 'holy grail' of rare gemstones. This 1.40cts. oval is from the only source of gem quality crystals, Pitosi in Bolivia.
Phenakite, also spelled Phenacite, rare mineral, beryllium silicate, Be2SiO4, used as a gemstone. Phenakite has long been known from the emerald and chrysoberyl mine on the Takovaya River, near Yekaterinburg (formerly Sverdlovsk), in the Urals region of Russia, where large crystals occur in mica schist. It also occurs in the granite of the Ilmen Mountains in the Urals and of the Pikes Peak region in Colorado.