A new anhydrous amphibole from the Hoskins mine , Grenfell , New South Wales , Australia : Description and crystal structure of ungarettiite , NaNar ( Mnl + Mn 3 + ) Si 8 O 22 O 2
A new anhydrous amphibole from the Hoskins mine , Grenfell , New South Wales , Australia : Description and crystal structure of ungarettiite , NaNar ( Mnl + Mn 3 + ) Si 8 O 22 O 2
复制标题
澳大利亚新南威尔士州格伦费尔霍斯金斯矿的一种新的无水角闪石：ungarettiite NaNar (Mnl Mn 3 ) Si 8 O 22 O 2 的描述和晶体结构
DOI：
--
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
M. Ashr
中科院分区：
文献类型：
--
作者：
FuNx;Alrpnro;Zlxnrn;D. Gnrcn;Canada.;Plur;M. Ashr
unarettiite是一种新的角闪洞物种，来自澳大利亚新南威尔士州格伦费尔附近的霍斯金斯矿。它与含锰氧化物、硅酸盐和碳酸盐一起赋存于层状片岩中，与变质碧玉、变质玄武岩和变质砂岩伴生。钨辉石质脆，H:6, D-*": 3.52 g/cm3, D-*": 3.45 g/cm3。在平面偏振光下，它具有强烈的多色性，X为橙红色，Z为深红色；X A A: -2 (in bacute), Y: b, Z A c: l70 （in b ob钝角），吸收X < Y < Z。Jngaretti为双轴阳性，A: 1.717(2), P: 1.780(4), r: 1.800(2):2V: 5l(2y)，色散r < V . [Jngaretti为单斜，空间群C2/m， A:9.89(2), b: 18.04(3), c:5.29(1) A, b: 104.6(2), V: 912(1) A', 7:2]。粉末中最强的10条x射线衍射线为（1,hk 1） 1: 2。176(10,17 1), 3。146(9,310),2。544(9,202),1。447 (9,3)；11。1), 3.400(8131), 1.656(8461), 8.522(7110), 2.299(7171), 2.575(6241), 2.047(6202)。通过电子探针和晶体结构精细化分析得出SiO为50.66，Alror为0.04，TiOr为0.03，FerOr为0.50，FeO为0.00，MnrO为24.35，MnO为12.42，MgO为1.46，ZnO为0.10，CaO为0.18，NarO为9。13, KrO 0.76，未检测到F，总计99.63 wto/o。公式是在24Oatomsis(&,rN%rrXNa,nrCa.or)(Mn？ZnoorXSiTerAto,)OrrO，接近NaNar(Mnl+ Mn3+) si80o,，Or的理想端元组成。利用MoKa x射线强度数据，将无辉石晶型结构细化到R指数为-1.50/o。位点散射细化表明，m1、M2和M3位点主要被Mn占据。（M- o）距离为Ml: 2.03;M2:2.17;M}.2.01 A，与场地占用率相适应Ml M3 Mn3+， M2 Mn2+。所有与03阴离子的键都很短，键价分析表明03位点被一个二价阴离子O2-占据，正如结构式的总体电子中性要求所表明的那样。
Ungarettiite is a new amphibole species from the Hoskins mine, near Grenfell, New South Wales, Australia. It occurs with Mn-bearing oxides, silicates, and carbonates in a stratiform schist associated with metajasper, metabasalt, and metasiltstone. Ungarettiite is britt le, H:6, D-*": 3.52 g/cm3, D.t":3.45 g/cm3.In plane-polarized l ight, it is stronglypleochroic, X: orangered, I Z: verydark red;X A a: -2 (inBacute), Y : b, Z A c : l7o (in B obtuse), with absorption X < Y < Z. IJngarettite is biaxial positive, a: 1.717(2), P: 1.780(4), r : 1.800(2):2V: 5l(2y, dispersion r < v. [Jngaretti i te is monoclinic, space group C2/m, a:9.89(2), b: 18.04(3), c:5.29(l) A, B: 104.6(2), V: 912(l) A', 7 : 2. The strongest ten X-ray diffraction lines in the powder pa t te rn a re ld (1 , hk l ) l : 2 .176 (10 ,17 l ) , 3 .146 (9 ,310 ) ,2 .544 (9 ,202 ) ,1 .447 (9 ,3 .11 .1 ) , 3.400(8,131), 1.656(8,461), 8.522(7,110),2.299(7,171),2.575(6,241), and,2.047(6,202). Analysis by a combination of electron microprobe and crystal-structure refinement gives SiO, 50.66, Alror 0.04, TiOr 0.03, FerOr 0.50, FeO 0.00, MnrO, 24.35, MnO 12.42,MgO l.46,ZnO 0.10, CaO 0.18, NarO 9. 13, KrO 0.76,F not detected, sum 99.63 wto/o. The formulaunitcalculatedonthebasis of 24Oatomsis(&,rN%rrXNa,nrCa.or)(Mn?kM&roMnlduFeflj.ZnoorXSiTerAto,)OrrO, and is close to the ideal end-member composition of NaNar(Mnl+ Mn3+ )Si8O,,Or. The crystal structure of ungarettiite was refined to an R index of -1.50/o using MoKa X-ray intensity data. Site-scattering refinement shows that the M I , M2, and M3 sites are occupied dominantly by Mn. The (M-O) distances are Ml: 2.03;M2:2.17;M}.2.01 A, compatible with the site occupancies Ml M3 Mn3+, M2 Mn2+. All bonds to the 03 anion are very short, and a bond valence analysis indicates that the 03 site is occupied by a divalent anion: O2-, as suggested by the overall electroneutrality requirement of the structural formula.