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红宝石是自然界产出十分稀少的单晶矿物,它同钻石、祖母绿、蓝宝石一起被誉为稀世珍宝。红宝石作为七月份诞生石,佩戴它象征和谐幸福,它还是结婚45周年的最好礼品。红宝石矿物学名刚玉,化学成分为Al_2O_3,其中Cr_2O_3含量0.1—3%,深红色微透明的红宝石Cr_2O_3含量可达4%。红宝石属三方晶系,晶体常呈桶状、柱状、板状等形态,有时也呈粒状或不规则状。晶面上常见晶面条纹,晶体无解理,但可以出现裂开面。红宝石硬度为9,仅次于钻石,比重4.02,玻璃光泽。大
Ruby is a very rare in nature produced single crystal minerals, which with diamonds, emeralds, sapphires together as a rare treasure. Ruby as a birthstone in July, wearing it a symbol of harmony and happiness, it is also the 45th anniversary of the best gift. Ruby mineralogical name corundum, the chemical composition of Al 2 O 3, including Cr 2 O 3 content of 0.1-3%, crimson red and transparent ruby Cr_2O_3 content of up to 4%. Ruby is a tripartite crystal system, the crystal often barrel, columnar, plate-shaped and other forms, and sometimes granular or irregular shape. Plane common crystal surface stripes, crystal no cleavage, but can appear cracked surface. Ruby hardness of 9, second only to diamonds, the proportion of 4.02, shiny glass. Big