Yellow Fluorite Barite! Check out this rare and lovely Yellow Fluorite specimen with Rhombic Barite crystals on top. A great piece with matrix that is mounted on a perspex pad for enhanced display. One for the collector of the rare and unusual.
6.3cm x 3cm x 4.7cm, 103g.
Named in 1797 by Carlo Antonio Galeani Napione from the Latin fluere to flow. Used as a flux for smelting metals. The term fluorescence is derived from fluorite, which will often markedly exhibit this effect. The element fluorine also derives its name from fluorite, a major source for the element. Fluorite is a mineral with a bouquet of brilliant colours. Well known and prized for its glassy luster and rich variety of colours. The range of common colours for fluorite starting from purple, then blue, green, yellow, colorless, brown and pink. Then some more black and reddish orange is amazing and is only rivaled in colour range by quartz. The most striking color is rainbow Fluorite which is hard to come by. Intermediate pastels between the previously mentioned colours are also possible. It is easy to see why fluorite earns the reputation as “The Most Colourful Mineral in the World”.
An ore of Barium. Magnetism: Diamagnetic. Thermal Behavior: Inverts to another (monoclinic ?) polymorph when heated to 1149°C. Above 1400°C decomposition to barium oxide, sulphur dioxide and oxygen. Thermoluminescent at times. Insoluble in water, acids and bases. Moderately soluble in hot, concentrated sulfuric acid, due to formation of the hydrogen sulphate.