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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 ...
Vivianite is a soft mineral, with Mohs hardness only to 2, and specific gravity 2.7. It splits easily, with perfect cleavage perpendicular to the b- crystal axis, due to the sheet-like structure of the mineral. It is sectile, with a fibrous fracture, and thin laminae parallel to the cleavage plane are flexible.
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]
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]
Morganite (gem) Morganite is an orange or pink variety of beryl and is also a gemstone. [2] Morganite is mined in Brazil, Afghanistan, Mozambique, Namibia, the United States, and Madagascar. [3] Morganite has grown in popularity since 2010. [2] Brides and CNN have listed it as a possible alternative to diamond for engagement rings. [4][5]