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  2. Fluorite - Wikipedia

    en.wikipedia.org/wiki/Fluorite

    The largest documented single crystal of fluorite was a cube 2.12 meters in size and weighing approximately 16 tonnes. [24] 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

  3. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...

  4. List of minerals by optical properties - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals_by...

    Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013

  5. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    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

  6. Fluoride - Wikipedia

    en.wikipedia.org/wiki/Fluoride

    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 ]

  7. Sumayar - Wikipedia

    en.wikipedia.org/wiki/Sumayar

    The fluorite occurs here in a variety of colors and crystal habits, that includes cubes, octahedra, and dodecahedra. Spinel-law twins have also been found here in incredible sizes. [3] Octahedral fluorite from the pegmatites of Chumar Bakhoor of Sumayar valley, Nagar district has been known for quite some time.

  8. Luminous gemstones - Wikipedia

    en.wikipedia.org/wiki/Luminous_gemstones

    The American sinologist Edward H. Schafer proposes that the phosphorescent "emeralds" of classical antiquity, such as the brilliantly shining green eyes of the marble lion on the tomb of King Hermias of Atarneus (d. 341 BCE) on Cyprus, were fluorite, even though the Hellenistic alchemists had methods, "seemingly magical, of making night-shining ...

  9. Chlorophane - Wikipedia

    en.wikipedia.org/wiki/Chlorophane

    Chlorophane, also sometimes known as pyroemerald, cobra stone, and pyrosmaragd, is a rare variety of the mineral fluorite with the unusual combined properties of thermoluminescence, thermophosphoresence, triboluminescence, and fluorescence: it will emit light in the visible spectrum when exposed to ultraviolet light, when heated, and when ...

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