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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 ...
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]
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]
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 ...
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 ...
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