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Hagstromite, Pb8Cu2+(Te6+O6)2(CO3)Cl4, a new lead–tellurium oxysalt mineral from Otto Mountain, California, USA
Mineralogical Magazine ( IF 2.7 ) Pub Date : 2020-04-27 , DOI: 10.1180/mgm.2020.30
Anthony R. Kampf , Robert M. Housley , Stuart J. Mills , George R. Rossman , Joe Marty

Hagstromite, Pb8Cu2+(Te6+O6)2(CO3)Cl4, (IMA2019-093) is a new tellurate mineral from Otto Mountain near Baker, California, USA. It occurs on quartz in association with cerussite, fuettererite and thorneite. It is a secondary oxidation zone mineral and is presumed to have formed by oxidation of earlier formed tellurides, chalcopyrite and galena. Hagstromite occurs as light yellow–green blades, up to ~100 μm long. Crystals are transparent with adamantine to silky lustre. The mineral is brittle with two cleavages providing splintery fracture; the Mohs hardness is probably between 2 and 3. The calculated density is 7.062 g cm–3. Hagstromite is optically biaxial (+), with calculated indices of refraction for α = 2.045, β = 2.066 and γ = 2.102; 2Vmeas = 76(1)°; and optical orientation X = b, Y = a and Z = c. The Raman spectrum of hagstromite exhibits similarities with those of agaite and thorneite and confirms the presence of CO32–. The electron microprobe analyses provided the empirical formula Pb8.07Cu2+0.98Te6+1.96C1.17Cl3.83O15.34. Hagstromite is orthorhombic, space group Ibam, with a = 23.688(17), b = 9.026(8), c = 10.461(8) Å, V = 2237(3) Å3 and Z = 4. The crystal structure of hagstromite (R1 = 0.0659 for 284 I > 2σI reflections) contains a novel Cu2+Te6+2O12 chain assembled of corner-sharing Cu2+O4 squares and Te6+O6 octahedra. The O atoms in the chains form bonds with Pb2+ cations, which in turn bond to Cl and CO32– anions, thereby creating a framework structure.



中文翻译:

Hagstromite,Pb 8 Cu 2+(Te 6+ O 62(CO 3)Cl 4,一种来自美国加利福尼亚州奥托山的新型铅-碲含氧盐矿物

Hagstromite,Pb 8 Cu 2+(Te 6+ O 62(CO 3)Cl 4(IMA2019-093)是来自美国加利福尼亚州贝克附近的奥托山的一种新型碲酸盐矿物。它在石英上与陶粒,针铁矿和钙铝石结合存在。它是次要的氧化带矿物,推测是由较早形成的碲化物,黄铜矿和方铅矿的氧化作用形成的。辉长岩以浅黄绿色叶片出现,长达约100μm。晶体透明,具有金刚烷到丝般的光泽。矿物是易碎的,有两个解理作用,使碎片破裂。莫氏硬度可能在2到3之间。计算出的密度是7.062 g cm –3。辉石为光学双轴性(+),计算得出的折射率为α= 2.045,β= 2.066和γ= 2.102;2V测量= 76(1)°; 和光学方向X = bY = aZ = c。辉长岩的拉曼光谱与闪锌矿和钙钛矿的拉曼光谱相似,并证实了CO 3 2–的存在。电子探针分析提供了经验式Pb 8.07 Cu 2+ 0.98 Te 6+ 1.96 C 1.17 Cl 3.83 O 15.34。Hagstromite是斜方晶系,空间群IBAM,用一个= 23.688(17),b = 9.026(8),C ^ = 10.461(8)A,V = 2237(3)3ž = 4 hagstromite的晶体结构([R 1 = 0.0659 284>2σ反射)包含一种新颖的Cu 2+6+ 2 ö 12链组装共角铜2+ Ò 4平方和Te 6+ ö 6八面体。链中的O原子与Pb 2+形成键阳离子,其进而键合氯-和CO 3 2-的阴离子,从而形成框架结构。

更新日期:2020-04-27
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