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南玉是广东省四大名石之一,又是全国三大玉石之一。它盛产于粤西山城——信宜市,尤以该市金垌镇泗流乡的为著名。据考察分析,南玉属透闪蛇纹岩,原为一种海相沉积的镁质碳酸盐岩石,生成于距今大约四亿多年前的早古生代,后来在岩浆活动影响下变质而成。它含有MgO、CaO、Al_2O_3、SiO_2、Fe_2O_3、MnO_2、B、Cu等多种元素,南玉为高质量的玉石矿,硬度高(一般达5度)、韧度强(可加工薄至2毫米),呈蜡状光泽,半透明,颜色多为翠绿色,故享有“南方碧玉”之美称。
South jade is one of the four famous stone in Guangdong Province, but also one of the three jade. It is rich in western Guangdong mountain city - Xinyi City, especially in the town of Jinli Township Si Liu Township for the famous. According to the investigation and analysis, Nanjue is a translucent serpentinite, which was originally a marine sedimentary magnesian carbonate rock formed in the Paleozoic about 400 million years ago and later metamorphosed under the influence of magmatism to make. It contains many elements such as MgO, CaO, Al_2O_3, SiO_2, Fe_2O_3, MnO_2, B and Cu. Nan Yu is high quality jade ore with high hardness (generally up to 5 degrees) and toughness ), Was waxy luster, translucent, the color is mostly emerald green, so enjoy the “Southern Jasper ” reputation.