Fisheye stone is a potassium calcium silicate mineral containing crystal water, and its chemical composition is KCa4Si8O20(F, OH)·8H2O, tetragonal system. Because the light scattered on the cleavage surface is pearly, it resembles the reflection color of the fisheye, so it is called "fisheye". The crystal is columnar, double-cone, equiaxed or plate-like, cluster, plate, granular, leaf-like aggregate, colorless, white, and contains red, light green, blue, yellow and other colors. Glass luster to pearl luster, transparent translucent, hardness 4.5 to 5, specific gravity 2.3 to 2.4, mainly produced in the amygdala and hydrothermal deposits of basic spouted rock, mostly with zeolite, calcite, crystal, amphibole, yellow Iron ore and other symbiosis. Plate crystal or columnar crystal, fisheye with beautiful color and certain thickness, known as gemstone, is a precious raw material for making various jewelry. In the past, only India produced fisheye stones, but there were not many commercial values, and even fewer gem-quality ones. Mineral Name: Fisheye Stone Chemical composition: KCa4Si8O20(F, OH)·8H2O Crystalline state: crystalline body. Crystal system: tetragonal system. Crystal habits: columnar, plate crystal, pseudo-cubic crystal. Common colors: colorless, yellow, green, purple, and pink. Gloss: Glass luster to pearl luster. Cleavage: A complete set of cleaves. Mohs hardness: 4 to 5. Density: 2.40 (±0.10) g/cm3. Photographic characteristics: heterogeneous, one-axis crystal, negative light. Polychromatism: The shades of different shades of color. Refractive index: 1.535 ~ 1.537. Birefringence: 0.002. Ultraviolet fluorescence: short wave: no weak, light yellow. Absorption spectrum: no characteristics. Enlarged inspection: gas-liquid inclusions.
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