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Blue John vaseA vase carved out of the mineral Blue John. The mineral is so far unique to one location in the Derbyshire Peak District, England
Edmond Fremy - 2EDMOND FREMY French chemist who made several valuable discoveries such as hydrogen fluoride gas, and wrote extensively on chemistry subjects. Date: 1814 - 1894
Fluorite, pale green octahedronWith calcite, galena and pyrite. Its properties include fluorescence and cubed crystals. Specimen from Glengowla East mine, Oughterard, Co. Galway, Eire
Topaz comprises of (aluminum silicate fluoride hydroxide). This is a specimen from the collections of the Natural History Museum, London
Russian topazTopaz comprises of (aluminum silicate fluoride hydroxide) and is the birthstone of November. Brown topaz specimens from the collections of the Natural History Museum, London
A selection of topaz cut stonesTopaz is the hardest silicate mineral and comprises of (aluminum silicate fluoride hydroxide)
ChondroditeChondrolite comprises of (magnesium iron silicate fluoride hydroxide) and often occurs in a granular form in crystalline limestones. Specimen from the Natural History Museum, London
TopazA crystal and a cut topaz stone from the collections of the Natural History Museum, London. Topaz comprises of (aluminum silicate fluoride hydroxide)
Birthstone Series: Blue Topaz
Birthstone Series: TopazTopaz has a chemical composition of aluminum silicate fluoride hydroxide and is the birthstone for the month of November (along with Citrine). Photographed by Frank Greenaway
Topaz crystals and faceted topaz showing a diverse colour range. Topaz comprises of (aluminum silicate fluoride hydroxide)
TopazBlue irradiated topaz pebbles and faceted topaz. Topaz is comprised of (aluminum silicate fluoride hydroxide)
TopazImage of Queen Victoria carved in topaz. Topaz comprises of (aluminum silicate fluoride hydroxide)
Fluorite6mm octahedral purple crystal on calcite collected from the Smith Vein, 1987. Green centre of the crystal does not show on film. Specimen from Carrock mine, Caldbeck, Cumbria
MuscoviteA specimen of muscovite (Potassium aluminum silicate hydroxide fluoride) with hematite and limonite inclusions, from Adelaide Australia
Topaz crystalAn imperial topaz crystal from Brazil, length 101mm long. Topaz comprises of (aluminum silicate fluoride hydroxide)
Schoolchildren learn how to rinse teeth with fluorine in a hygiene lesson 1965 Date: 1965