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The largest documented single crystal of fluorite was a cube 2.12 meters in size and weighing approximately 16 tonnes. [23] Fluorite on barite from the Berbes mine, Ribadesella, Asturias (Spain). Fluorite crystal, 2.2 cm. In Asturias there are several fluorite deposits known internationally for the quality of the specimens they have yielded
Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013
Crystal of titanite with adularia and minor clinochlore on matrix Fluorite crystal sitting beside a glassy, dark green tourmaline crystal, which itself sits atop a green tourmaline of a lighter color. All sit on a bed of sparkly, bladed stark white albite Crystals of turquoise, from Copper Cities Mine, Globe-Miami District, Arizona, USA
Fluorite crystals. Fluorine is estimated to be the 13th-most abundant element in Earth's crust and is widely dispersed in nature, entirely in the form of fluorides. The vast majority is held in mineral deposits, the most commercially important of which is fluorite (CaF 2). [4]
One source is the Deqing Fluorite Mine, in Deqing County, Zhejiang Province, [1]: 40 the only source (other than in Derbyshire) that has an ornamental craft based upon it. [ 1 ] : 38 However, although this fluorite is similar to Blue John its banding is straighter and it contains colours not associated with Blue John, suggesting they are ...
Some fluorite, particularly the variety chlorophane (aka pyroemerald and cobra stone), may become very faintly luminescent simply from the heat of one's hand. Chlorophane is unusual for combining the properties of thermoluminescence, triboluminescence, phosphorescence, and fluorescence; it will emit visible spectrum light when rubbed, or ...