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Fluorite is normally colorless, but some varied forms found nearby look black, and are known as 'fetid fluorite' or antozonite. The minerals, containing small amounts of uranium and its daughter products, release radiation sufficiently energetic to induce oxidation of fluoride anions within the structure, to fluorine that becomes trapped inside ...
It is associated with barite, hematite, norsethite and fluorite. [5] The inclusions form as bands within fluorite. The mineral occurs in fluorite as inclusions, up to 100 μm. However, they are typically much smaller, about 50 μm. [2] It consists of barium mostly (71.21%), chlorine (18.94%) and fluorine (9.85%). [6]
The fluorite structure refers to a common motif for compounds with the formula MX 2. [1] [2] The X ions occupy the eight tetrahedral interstitial sites whereas M ions occupy the regular sites of a face-centered cubic (FCC) structure. Many compounds, notably the common mineral fluorite (CaF 2), adopt this structure.
The formula of the admixture of the three most common endmembers is written as Ca 10 (PO 4) 6 (OH,F,Cl) 2, and the crystal unit cell formulae of the individual minerals are written as Ca 10 (PO 4) 6 (OH) 2, Ca 10 (PO 4) 6 F 2 and Ca 10 (PO 4) 6 Cl 2.
Formula (repeating unit) ... A single stark green fluorite isolated on top ... The IMA commission on new mineral names published a list of approved symbols for each ...
Bertrandite is a beryllium sorosilicate hydroxide mineral with composition: Be 4 Si 2 O 7 (OH) 2.Bertrandite is a colorless to pale yellow orthorhombic mineral with a hardness of 6–7.
Strontiofluorite is a halide mineral that contains the alkali earth metal strontium and the halogen fluorine, a form of strontium fluoride.It can be considered a strontium-analogue of fluorite, which contains calcium as the dominant cation instead.
Fluoborite has a chemical formula of Mg 3 (BO 3)(F,OH) 3. Its name comes from its main chemical components, fluorine and boron. It was first described in 1926. [3] Fluoborite's crystal system is hexagonal, meaning it has one six-fold axis of rotation. It also has a mirror plane perpendicular to the c-axis. [5]