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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 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

  4. Tourmaline - Wikipedia

    en.wikipedia.org/wiki/Tourmaline

    A single stark green fluorite isolated on top of schorl crystals Schorl, magnified 10×. The most common species of tourmaline is schorl, the sodium iron (divalent) endmember of the group. It may account for 95% or more of all tourmaline in nature.

  5. Fluorite structure - Wikipedia

    en.wikipedia.org/wiki/Fluorite_structure

    Calcium fluoride is a classic example of a crystal with a fluorite structure. Crystallographic information can be collected via x-ray diffraction, providing information on the locations of electron density within a crystal structure. Using modern software such as Olex2, [4] one can solve a crystal structure from crystallographic output files.

  6. 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

  7. 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]

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