论文部分内容阅读
宝石界所稱黃寶石是專指礦物學上稱之為黃玉的宝石而言。黃玉(TOPAZ)是一種鋁的氟硅酸鹽,其化學成分為Al_2(SiO_4)(F、OH)_2,摩氏硬度為8,玻璃光澤,斜方晶系,晶體呈柱形,柱面有縱紋,端部常为錐狀。密度3.50—3.57克/立方厘米。黃玉的顏色并不只有黃色一種,不同礦牀的黃玉顏色差異很大,無色諸多,此外还有粉紅、紅褐、黃、藍、淺紫和綠色等。廣東的黃玉以無色和米黃色为主。黃玉中往往含有兩種互不混溶的液體或氣泡。透明度好的黃玉晶體稱為黃晶,是真正的黃寶石珍貴原料。衡量寶石價值的標準有重量、色泽、硬度、純度、折光及批工等。黃晶作為寶石除重量、硬
The gemstone industry refers to the gemstone is specifically refers to the mineralogy is called topaz terms. Topaz is an aluminum fluorosilicate with a chemical composition of Al 2 (SiO 4) (F, OH) 2, a Mohs hardness of 8, a glassy luster, orthorhombic system, a crystal columnar shape, a cylindrical There are vertical stripes, the tip is often conical. Density 3.50-3.57 grams / cubic centimeter. Topaz is not only a yellow color, different deposits vary greatly topaz color, many colorless, in addition to pink, reddish brown, yellow, blue, light purple and green and so on. Guangdong’s topaz to colorless and beige-based. Topaz often contains two mutually immiscible liquids or bubbles. Transparent crystal of topaz, called topaz, is a precious yellowstone precious raw material. The criteria for measuring the value of gems are weight, color, hardness, purity, refraction and batch work. Citrine in addition to weight as a gem, hard