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Apatite is a group of phosphate minerals, usually hydroxyapatite, fluorapatite and chlorapatite, with high concentrations of OH −, F − and Cl − ion, respectively, in the crystal. 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 ...
Dark inclusions of aegerine in light-green apatite Sketch showing different shapes of inclusions. In mineralogy, an inclusion is any material trapped inside a mineral during its formation. In gemology, it is an object enclosed within a gemstone or reaching its surface from the interior. [1]
Pleochroism of cordierite shown by rotating a polarizing filter on the lens of the camera Pleochroism of tourmaline shown by rotating a polarizing filter on the lens ...
Fluorapatite as a naturally occurring impurity in apatite generates hydrogen fluoride as a byproduct during the production of phosphoric acid, as apatite is digested by sulfuric acid. The hydrogen fluoride byproduct is now one of the industrial sources of hydrofluoric acid , which in turn is used as a starting reagent for synthesis of a range ...
magnetite, ilmenite, apatite, titanite Nepheline syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar . [ 1 ] The rocks are mostly pale colored, grey or pink, and in general appearance they are not unlike granites , but dark green varieties are also known.
Greenschist is defined by the presence of the minerals chlorite, epidote, or actinolite, which give the rock its green color. Greenschists also have pronounced schistosity . [ 3 ] Schistosity is a thin layering of the rock produced by metamorphism (a foliation ) that permits the rock to easily be split into flakes or slabs less than 5 to 10 ...
At the very top of Billionaire Mountain, I stopped at The Peak House, a 22,000-square-foot estate that sold for $40 million in 2022. The Peak House is the highest residence on Red Mountain and ...
Herderite is a phosphate mineral belonging to the apatite, phosphate group, with formula CaBe(PO 4)(F,OH).It forms monoclinic crystals, often twinned and variable in colour from colourless through yellow to green.