Adanite, a new lead-tellurite-sulfate mineral from the North Star mine, Tintic, Utah, and Tombstone, Arizona, USA

IF 1.1 4区地球科学 Q3 MINERALOGY

Canadian Mineralogist Pub Date : 2020-05-01 DOI:10.3749/canmin.2000010

A. Kampf, R. Housley, G. Rossman, Hexiong Yang, R. Downs

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引用次数: 4

Abstract

Adanite, Pb₂ (Te⁴⁺O₃)(SO₄), is a new oxidation-zone mineral from the North Star mine, Tintic district, Juab County, Utah, and from Tombstone, Cochise County, Arizona, USA. The characterization of the species is based principally on North-Star holotype material. Crystals are beige wedge-shaped blades, up to about 1 mm in length, in cockscomb intergrowths. The mineral is transparent with adamantine luster, white streak, Mohs hardness 2½, brittle tenacity, conchoidal fracture, and no cleavage. The calculated density is 6.385 g/cm³. Adanite is biaxial (–), with α = 1.90(1), β = 2.04(calc), γ = 2.08(calc), 2V(meas) = 54(1)°. The Raman spectrum is consistent with the presence of tellurite and sulfate groups and the absence of OH and H₂O. Electron-microprobe analyses gave the empirical formula Pb_(1.89)Sb³⁺_(0.02)Te⁴⁺_(0.98)S⁶⁺_(1.04)Cl_(0.02)O_(6.98). The mineral is monoclinic, space group P2₁/n, with a = 7.3830(3), b = 10.7545(5), c = 9.3517(7) A, β = 111.500(8)°, V = 690.86(7) A₃, and Z = 4. The four strongest X-ray powder diffraction lines are [dobs A(I)(hkl)]: 6.744(47)⁠, 3.454(80)⁠, 3.301(100)⁠, and 3.048(73)⁠. The structure (R₁ = 0.022 for 1906 I > 2σI reflections) contains Te⁴⁺O₃ pyramids that are joined by short (strong) Pb–O bonds to form sheets. Interlayer SO₄ groups link the sheets via long Pb–O and Te–O bonds.

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Adanite，一种新的铅碲硫酸盐矿物，来自美国犹他州Tintic和亚利桑那州Tombstone的North Star矿

Adanite, Pb₂(Te⁴⁺O₃)(SO₄)是一种新的氧化带矿物，来自犹他州Juab县Tintic区North Star矿和美国亚利桑那州Cochise县Tombstone矿。该物种的特征主要基于北星全模材料。晶体是米黄色的楔形叶片，长度可达1毫米左右，在鸡冠状丛生物中。该矿物透明，具有金刚光泽，白色条纹，莫氏硬度2½，脆韧性，贝壳状断裂，无解理。计算密度为6.385 g/cm³。Adanite双轴(-),α= 1.90(1),β= 2.04(钙)、γ= 2.08(钙),2 v(量)= 54(1)°。拉曼光谱与碲和硫酸盐基团的存在一致，没有OH和h2o。电子探针分析给出了实验式Pb_(1.89)Sb³⁺_(0.02)Te⁴⁺_(0.98)S 26⁺_(1.04)Cl_(0.02)O_(6.98)。该矿物为单斜型，空间群为P2₁/n, a = 7.3830(3)， b = 10.7545(5)， c = 9.3517(7) a， β = 111.500(8)°，V = 690.86(7) a₃，Z = 4。四条最强的x射线粉末衍射线为[dobs A(I)(hkl)]: 6.744(47)、3.454(80)、3.301(100)和3.048(73)。该结构(对于1906 I > 2σI反射，R₁= 0.022)包含Te⁴⁺O₃金字塔，这些金字塔由短(强)Pb-O键连接成薄片。层间的SO₄基团通过长Pb-O和Te-O键连接薄片。

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来源期刊

Canadian Mineralogist 地学-矿物学

CiteScore

2.20

自引率

22.20%

发文量

审稿时长

4-8 weeks

期刊介绍： Since 1962, The Canadian Mineralogist has published papers dealing with all aspects of mineralogy, crystallography, petrology, economic geology, geochemistry, and applied mineralogy.