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Vesuvianite, also known as idocrase, is a green, brown, yellow, or blue silicate mineral. Vesuvianite occurs as tetragonal crystals in skarn deposits and limestones that have been subjected to contact metamorphism. [3] It was first discovered within included blocks or adjacent to lavas on Mount Vesuvius, hence its name. Attractive-looking ...
Hydrogrossular is found in massive crystal habit, sometimes grown in with idocrase. [2] Hydrogrossular is translucent to opaque, and found in green to bluish green, pink, white, and gray. The cause of the green color is chromium, and possibly iron. Pink hydrogrossular is caused by the presence of manganese.
Skarn mineralogy is dominated by garnet and pyroxene with a wide variety of calc-silicate and associated minerals, including idocrase, wollastonite, actinolite, magnetite or hematite, epidote and scapolite.
Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013
Differences in chemical composition and crystal structure distinguish the various species. Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral variety. Mineral variety names are listed after the valid minerals for each letter.
Actinolite. Nephrite (var.); Adamite; Aegirine; Afghanite; Agrellite; Algodonite; Alunite; Amblygonite; Analcime; Anatase; Andalusite. Chiastolite; Andesine ...
Fluorellestadite shows imperfect cleavage perpendicular to the long crystal axis. [ 3 ] [ 7 ] The mineral is very brittle, and breaks with a conchoidal fracture . [ 4 ] Its hardness is 4 + 1 ⁄ 2 , between that of fluorite and apatite , and its specific gravity is 3.03 to 3.07, similar to that of fluorite.
A silicate mineral is generally an inorganic compound consisting of subunits with the formula [SiO 2+n] 2n−.Although depicted as such, the description of silicates as anions is a simplification.