Ebnerite and epiebnerite: NH4ZnPO4 dimorphs with zeolite-type frameworks from the Rowley mine, Arizona, USA

IF 2.8 3区 地球科学 Q2 MINERALOGY
Anthony R. Kampf, Xiangping Gu, Hexiong Yang, Chi Ma, Joe Marty
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引用次数: 0

Abstract

Ebnerite and epiebnerite, both with the ideal formula NH4ZnPO4, are new mineral species from the Rowley mine, Maricopa County, Arizona, USA. They occur in an unusual bat-guano-related, post-mining assemblage of phases. Epiebnerite grows epitactically on ebnerite and replaces it. Ebnerite and epiebnerite are found in intimate association with alunite, halite, mimetite, newberyite, sampleite, struvite and wulfenite on hematite-rich quartz–baryte matrix. Crystals of ebnerite are colourless narrow prisms up to ~0.3 mm in length. The streak is white, lustre is vitreous, Mohs hardness is ~2, tenacity is brittle and fracture is splintery. The density is 2.78(2) g⋅cm–3. Ebnerite is optically uniaxial (–) with ω = 1.585(2) and ɛ = 1.575(2). Epiebnerite occurs as colourless prisms or blades, up to about 10 × 3 × 2 μm, in parallel growth forming ribs with serrated edges epitactic on ebnerite prisms. The streak is white, lustre is vitreous, Mohs hardness is probably ~2, tenacity is brittle. The calculated density is 2.851 g⋅cm–3. Epiebnerite is optically biaxial with all indices of refraction near 1.580. Electron microprobe analysis gave the empirical formula [(NH4)0.89K0.06]Σ0.95(Zn0.96Cu0.07)Σ1.03[(P0.97Si0.03)Σ1.00O4] for ebnerite and [(NH4)0.67K0.28]Σ0.95(Zn0.99Cu0.02)Σ1.02(P1.00O4) for epiebnerite. Ebnerite is hexagonal, P63, with a = 10.67051(16), c = 8.7140(2) Å, V = 859.25(3) Å3 and Z = 8. Epiebnerite is monoclinic, P21, with a = 8.796(16), b = 5.457(16), c = 8.960(16) Å, β = 90.34(6)°, V = 430.1(17) Å3 and Z = 4. The structures of ebnerite (R1 = 0.0372 for 1168 Io > 2σI reflections) and epiebnerite (known from synthetic monoclinic NH4ZnPO4) are zeolite-like frameworks based upon corner-sharing linkages between alternating ZnO4 and PO4 tetrahedra with channels in the frameworks hosting the NH4 groups. The two structures are topologically distinct. Ebnerite belongs to the family of ‘stuffed derivatives’ of tridymite, whereas epiebnerite possesses an ABW-type zeolite structure.

Ebnerite和epiebnerite:来自美国亚利桑那州罗利矿的具有沸石型框架的 NH4ZnPO4 二形晶
Ebnerite和epiebnerite的理想化学式均为NH4ZnPO4,是来自美国亚利桑那州马里科帕县罗利矿的新矿物物种。它们出现在一个不寻常的与蝙蝠冠有关的矿后相集合体中。表闪长岩附生在黑云母上,并取代黑云母。在富含赤铁矿的石英重晶石基质上,埃贝纳铁矿和表贝纳铁矿与明矾石、海绿石、拟镁铁矿、新贝里铁矿、闪长岩、闪长岩和乌芬铁矿紧密地结合在一起。黑云母晶体为无色窄棱柱,长度可达约 0.3 毫米。条纹为白色,光泽为玻璃光泽,莫氏硬度约为 2,韧性为脆性,断口为劈裂状。密度为 2.78(2) 克-厘米-3。辉绿岩的光学性质为单轴(-),ω = 1.585(2),ɛ = 1.575(2)。表闪长岩呈无色棱柱或叶片状,大小约为 10 × 3 × 2 μm,平行生长,在闪长岩棱柱上形成边缘呈锯齿状的外延棱纹。条纹为白色,光泽为玻璃光泽,莫氏硬度约为 ~2,韧性较脆。计算密度为 2.851 g-cm-3。表闪石具有光学双轴性,所有折射率都接近 1.580。电子显微镜分析得出的经验公式为[(NH4)0.89K0.06]Σ0.95(Zn0.96Cu0.07)Σ1.03[(P0. 97Si0.03)Σ1.03]。97Si0.03)Σ1.00O4],而表闪长岩为[(NH4)0.67K0.28]Σ0.95(Zn0.99Cu0.02)Σ1.02(P1.00O4)。埃白云母为六方晶系,P63,a = 10.67051(16),c = 8.7140(2)埃,V = 859.25(3)埃3,Z = 8;表白云母为单斜晶系,P21,a = 8.796(16),b = 5.457(16),c = 8.960(16)埃,β = 90.34(6)°,V = 430.1(17)埃3,Z = 4。埃勃来石(1168 Io > 2σI 反射的 R1 = 0.0372)和表勃来石(从合成单斜 NH4ZnPO4 中得知)的结构是基于交替 ZnO4 和 PO4 四面体之间的分角连接的沸石状框架,框架中的通道容纳了 NH4 基团。这两种结构在拓扑学上截然不同。埃勃来特属于三闪长岩的 "填充衍生物 "家族,而表勃来特则具有 ABW 型沸石结构。
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来源期刊
Mineralogical Magazine
Mineralogical Magazine 地学-矿物学
CiteScore
4.00
自引率
25.90%
发文量
104
审稿时长
6-12 weeks
期刊介绍: Mineralogical Magazine is an international journal of mineral sciences which covers the fields of mineralogy, crystallography, geochemistry, petrology, environmental geology and economic geology. The journal has been published continuously since the founding of the Mineralogical Society of Great Britain and Ireland in 1876 and is a leading journal in its field.
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