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Properties. Kyanite is an aluminum silicate mineral, with the chemical formula Al2SiO5. It is typically patchy blue in color, though it can range from pale to deep blue [6] and can also be gray or white or, infrequently, light green. [7] It typically forms sprays of bladed crystals, but is less commonly found as distinct euhedral (well-shaped ...
A 23 millimetres (0.91 in) coin added for scale. Eclogite ( / ˈɛklədʒaɪt /) is a metamorphic rock containing garnet (almandine - pyrope) hosted in a matrix of sodium -rich pyroxene (omphacite). Accessory minerals include kyanite, rutile, quartz, lawsonite, coesite, amphibole, phengite, paragonite, zoisite, dolomite, corundum and, rarely ...
Kainite (/ ˈkaɪnaɪt / or / ˈkeɪnaɪt /) [4] (KMg (SO 4)Cl·3H 2 O) is an evaporite mineral in the class of "Sulfates (selenates, etc.) with additional anions, with H 2 O" according to the Nickel–Strunz classification. It is a hydrated potassium-magnesium sulfate-chloride, naturally occurring in irregular granular masses or as crystalline ...
Pure crystals of garnet are still used as gemstones. The gemstone varieties occur in shades of green, red, yellow, and orange. [53] In the US it is known as the birthstone for January. [2] The garnet family is one of the most complex in the gem world. It is not a single species, but is composed of multiple species and varieties. [54]
Untreated tanzanite is a trichroic gemstone, meaning that light that enters this anisotropic crystal gets refracted on different paths, with different colour absorption on each of the three optical axes. As a result of this phenomenon, a multitude of colors have been observed in various specimens: shades of purple, violet, indigo, blue, cyan ...
Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2.It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7]
Acicular - occurs as needle-like crystals. Bladed - aggregates of thin lath-like crystals (e.g. kyanite) Pinalite is a rare lead tungstate – chloride mineral with formula: Pb 3 WO 5 Cl 2. Pinalite crystallizes in the orthorhombic crystal system. [5] The orthorhombic system is described as having three crystallographic axes of unequal lengths ...
Andalusite. double refractive, biaxial negative; chiastolite has anomalous aggregate reaction. [1] Andalusite is an aluminium nesosilicate mineral with the chemical formula Al 2 SiO 5. This mineral was called andalousite by Delamétherie, [3] who thought it came from Andalusia, Spain. It soon became clear that it was a locality error, and that ...