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Natural ruby crystalThis ruby is a staggering 1, 085 carats. Mined in Burmas Mogok (Myanmar s) mines and bought by the Museum in 1924 from Burma Ruby Mines Ltd. It is one of the largest crystals in the Museum collection
Susannite on Caledonite4mm crystal of susannite (carbonate) in a mass of caledonite (suplhate). Specimen from the Roughton Gill mine, Caldbeck Fells, Cumbria
Fluorite, pale green octahedronWith calcite, galena and pyrite. Its properties include fluorescence and cubed crystals. Specimen from Glengowla East mine, Oughterard, Co. Galway, Eire
ScheeliteCrystals of scheelite (calcium tungstate), an important ore of tungsten from the collections of the Natural History Museum, London
Diamonds fluorescingMurchison snuff box set with diamonds fluorescing under ultra violet radiation. Gold snuff box set with diamonds ranging from 0.75 to 2.5 carats, presented to Sir R. I. Murchison by Tsar Alexander II
CelestiteA mass of celestite crystals. Celestite is strontium sulphate and is the source of red colours in fireworks
Autunite comprises of (hydrated calcium uranyl phosphate). This is a green, radioactive, highly fluorescent mineral. This specimen is from the Natural History Museum, London
Franklinite, fluorescingOre of zinc fluorescing under ultra violet radiation: calcite - pink; willemite - green; zincite - blue; franklinite - black. See image number 388 for white light view
WillemiteA specimen of willemite (zinc silicate) photographed under UV light
Torbernite
Opal doubletsOpals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)
AdamiteA specimen of the mineral adamite (zinc arsenate hydroxide). It is a fluorescent mineral, popular among collectors and shows bright green fluorescent under UV lights
Fluorescent groupA group including amber, ruby, ivory, fluorite and opal photographed in ultra violet light. See 179 for the same group in white light