黑瑪瑙? ????????Onyx
瑪瑙的主要成份都是SiO2(二氧化硅),質(zhì)地很純時(shí)為灰色,若含有色素時(shí)便呈現(xiàn)紅、黑、藍(lán)、綠等各色?,旇б话愠释该鞯讲煌该?,硬度6.5至7度,比重2.55至2.91,折射率1.535至1.539。世界最著名的黑瑪瑙產(chǎn)地有印度、巴西等地。
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The main ingredients of Onyx are SiO2. The color is gray when the texture is pure. If they contain varies of pigment, they will show red, black, blue, green and so on. Generally, onyx is transparent to translucent, hardness is 6.5-7.0, the proportion is 2.55 to 2.91, the refractive index is 1.535 to 1.539. The most famous origins of Onyx in the world are India, Brazil and other places.
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