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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 ...
Staurolite is a reddish brown to black, mostly opaque, nesosilicate mineral with a white streak. It crystallizes in the monoclinic crystal system, has a Mohs hardness of 7 to 7.5 and the chemical formula: Fe 2+2 Al 9 O 6 (SiO 4) 4 (O,OH) 2. Magnesium, zinc and manganese substitute in the iron site and trivalent iron can substitute for aluminium.
Dumortierite is a fibrous variably colored aluminium boro - silicate mineral, Al 7 BO 3 (SiO 4) 3 O 3. Dumortierite crystallizes in the orthorhombic system typically forming fibrous aggregates of slender prismatic crystals. The crystals are vitreous and vary in color from brown, blue, and green to more rare violet and pink.
Easily to a colourless glass; sodium yellow flame. Solubility. Soluble in hydrochloric acid and nitric acid. References. [2][3][4][5] Major varieties. Hackmanite. Tenebrescent; violet-red or green fading to white. Sodalite (/ ˈsoʊ.dəˌlaɪt / SOH-də-lyte) is a tectosilicate mineral with the formula Na.
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.