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富锶文石的发现及其研究
The Discovery and Study of Strontianiferous Aragonite
  
中文关键词:
英文关键词:strontianiferous aragonite, aragonite, carbonate mineral, variety, Bayan Obo
基金项目:
梁有彬
中国有色金属总公司矿产地质研究院
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中文摘要:
      富锶文石是文石的变种,其化学式为(Ca,Sr)CO3。二轴晶,负光性,2▽=9,折光率Ng=1.6620,Nm=1.6561,Np=1.5168,D=3.34,H=3.75,比磁化系数为0.32×10-6CGSMcm3/g。矿物为白色,透明,呈细小晶粒状或砂糖状集合体。易溶于稀盐酸。斜方晶系,晶胞参数a=4.61A,b=7.89A,c=5.78A。矿物产于内蒙古白云鄂博铁、铌、稀土矿床的脉状含铌、稀土白云石碳酸盐岩中,在自然界中产出含锶如此之高的变种是罕见的。该矿物的发现对研究碳酸盐矿物中钙、锶元素类质同象置换机理和晶体光学均具有一定的学术意义。
英文摘要:
       The strontianiferous aragonite reported in the present paper is an aragonitic variety found in Bayan Obo iron ore deposit,Inner Mongolia. It occurs in veined Nb-,REE-bearing dolomitecarbonatite and is mainly associated with dolomite, ankerite,monazite, carbocernaite, pyrochlore, norsethite,calcite, calcios- trontianite, benstonite, zircon, apatite, phlogopite and albite. Strontianiferous aragonite is similar in chemical composition and crystal texture to aragonite, It acquires this name simply on account of its chemical composition and crystal texture. The mineral occurs as a fine-grained aggregate with individual crystal 0.Ol-0.03mm in diameter, transparent, white in color,luster vitreous,streak white, D=3.34, H(vicies)=180-190kg/mm2 (=3 .8Mohe), K=0.32× 10-6C.G.S.M.cm 3/gram. In transmitted light the mineral is transparent and colorless, cleavage no or very imperfect.It is biaxial negative with 2V=9?, Ng=1.6620, Nm=1.6561, Np=1. 5168. X-ray investigation sho;vs that the mineral is orthorhombic,with unit cell values being a=4.91, b=7.89 and c=5.78,The strongest X-ray spacings are 5.39(5),3.456(10),3.354( 8),3.773(7),2.398( 7).2.016(9)。1.864( 9). Chemical analysis yields the formula of(Ca0.4964 Sr0.4445 Mg0.0114 Ba0.0170 Al0.0007 Fe0.0038 K0.0009 Na0.0063 Mn0.0016 REE0.0066) 0.9892 [(CO3)0.9973 (OH)0.0308]1.0281 with the brief form being (Ca, Sr)CO3.Its DTA curve and infra-red spectrum are similar to those of aragonite.
梁有彬,1990,富锶文石的发现及其研究[J].岩石矿物学杂志,9(1):79~84.
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