论文部分内容阅读
钻石矿物学名金刚石。十八世纪前,印度是世界钻石的唯一产地,现产出极少。1725年巴西发现钻石,其后约150年间为世界钻石的主要来源地,产于米纳斯热赖斯州的砂矿中,现年产量仅有25万克拉。1866年南非(阿扎尼亚)瓦尔河砂
Diamond mineral science name diamond. Before the eighteenth century, India was the only place where diamonds in the world were made and very few were produced. Diamond was found in Brazil in 1725 and was the main source of diamonds in the world for about 150 years. It was produced in the mines of Minas Gerais and now produces only 250,000 carats. 1866 South Africa (Azania) Valle sand