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黄玉的主要成分是氧、硅、铝,分别是地壳中最丰富的三种元素。这种岛状硅酸盐是典型的气成热液矿物,形成于高温富挥发成分的环境中。在花岗伟晶岩体中经常能看见它的身影,高温气成热液矿脉以及流纹岩中也能看见它的身影。不论何种成因,黄玉容易形成相对大而完整的晶体,伟晶岩矿脉中发现过多枚几十千克的完整巨晶。虽然名为黄玉,但是它并不总是黄色的。多数黄玉无色透明,或者呈接近无色的淡黄褐色;而有一定浓度的香槟色、棕黄色、橘黄色黄玉则较为珍贵;淡蓝色、淡绿色、淡粉色的黄玉更加稀有;而最珍贵的是那些天然的拥有较为浓郁的蓝色、粉色或者紫红色的黄玉。作为宝石,黄玉色散度、折射率指标均不出众,所以人们用辐射加热的方法处理它,使之呈现出迷人的蓝色,虽然这种颜色的黄玉在自然界里是不存在。
Topaz is the main component of oxygen, silicon, aluminum, respectively, the crust of the three most abundant elements. This island silicate is a typical hydrothermal hydrothermal mineral formed in a high-temperature and volatile-rich environment. It can often be seen in the granitic pegmatite bodies, as can also be seen in pyroclastic hydrothermal veins and rhyolite. No matter what causes, topaz is easy to form a relatively large and complete crystal, pegmatite veins found in excess of dozens of kilograms of complete giant crystal. Although named Topaz, it is not always yellow. Most topaz is colorless and transparent, or is nearly colorless light brown; and a certain concentration of champagne, brown, orange yellow topazes are more precious; light blue, light green, pale pink topaz more rare; and most Precious is those who have a more natural rich blue, pink or purple topaz. As a gem, topaz dispersion, refractive index index are not outstanding, so people use radiation heating method to deal with it, so that it presents a charming blue, although this color of topaz does not exist in nature.