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首页> 外文期刊>The American mineralogist >Meurigite-Na, a new species, and the relationship between phosphofibrite and meurigite
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Meurigite-Na, a new species, and the relationship between phosphofibrite and meurigite

机译：一种新物种Meurigite-Na及其与磷纤维蛋白和Meurigite的关系

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摘要

The new mineral meurigite-Na, [Na(H2O)2.5][Fe3+ 8 (PO4)6(OH)7(H2O)4], is monoclinic with space group C2/c and cell parameters a = 28.835(2), b = 5.1848(4), c = 19.484(1) A, β = 106.983(6)°, V = 2785.8(2) A3, and Z = 4. It is the Na analog of meurigite, which is now named meurigite-K. The type locality of meurigite-Na is the Silver Coin mine, Valmy, Iron Point district, Nevada, where it occurs as radial sprays of cream-colored, flattened fibers (thin laths) to 0.4 mm in length. At the Silver Coin mine, meurigite-Na occurs very late in a paragenetic sequence that includes (in approximate order from early to late) quartz, barite, apatite-(CaF), goethite, rockbridgeite, cacoxenite, alunite, wardite, turquoise/chalcosiderite, leucophosphite, lipscombite/zinclipscombite, kidwellite, strengite/ variscite, crandallite/perhamite, and jarosite. Meurigite-Na also occurs at Tom’s quarry and Moculta quarry in South Australia, Australia, Lake Boga quarry and probably Rixon’s Sandstone quarry in Victoria, Australia, and at an unnamed pegmatite prospect near Linopolis, Minas Gerais, Brazil. The streak is white, the luster is silky, and the Mohs hardness is about 3. The measured density is 2.94(2) g/cm3 and the calculated density is 2.954 g/cm3. Optical properties: biaxial (–), α = 1.740(3), β = 1.759(3), γ = 1.763(3), 2Vmeas = 50(10)°; X c, Z = b. The strongest powder X-ray diffraction lines are [d(hkl)I]: 13.8(200)20, 9.35(002)100, 4.843(111)20, 3.206(712)40, 3.107(713)30, 2.971(513)15, and 2.593(116)15. Meurigite-Na is insoluble in concentrated HCl. Evaluation of powder XRD and chemical-analytical data in light of the structure determination for meurigite-K leads to the conclusion that type phosphofibrite is isostructural with meurigite and represents the alkali-deficient member of a series with meurigite-K.
机译：新的矿物蒙脱石-Na [Na（H2O）2.5] [Fe3 + 8（PO4）6（OH）7（H2O）4]是单斜晶的，空间组为C2 / c，单元参数a = 28.835（2），b = 5.1848（4），c = 19.484（1）A，β= 106.983（6）°，V = 2785.8（2）A3，Z =4。它是穆里石的Na类似物，现在被命名为meurigite-K 。钠铁矿型钠的类型局部性是内华达州Iron Point地区Valmy的Silver Coin矿，以放射状喷涂奶油色扁平纤维（薄板条）至0.4毫米长而形成。在银币矿中，钠铁矿Na发生在很晚的共生序列中，包括（按从早到晚的大致顺序）石英，重晶石，磷灰石（CaF），针铁矿，岩桥石，钙锰矿，铝矾石，方铁矿，绿松石/菱铁矿，亚磷灰石，口疮/锌口疮，kidwellite，硬藻土/方英石，芒绿石/高岭土和黄钾铁矾。 Meurigite-Na也出现在澳大利亚南澳大利亚的Tom采石场和Moculta采石场，Boga湖采石场以及澳大利亚维多利亚州Rixon的砂岩采石场，以及巴西米纳斯吉拉斯州利诺波利斯附近的未命名伟晶岩前景。条纹为白色，光泽为丝状，莫氏硬度约为3。测得的密度为2.94（2）g / cm3，计算出的密度为2.954 g / cm3。光学特性：双轴（–），α= 1.740（3），β= 1.759（3），γ= 1.763（3），2Vmeas = 50（10）°; X c，Z = b。最强的粉末X射线衍射线是[d（hkl）I]：13.8（200）20，9.35（002）100，4.843（111）20，3.206（712）40，3.107（713）30，2.971（513） 15）和2.593（116）15。 Meurigite-Na不溶于浓HCl。根据对Murigite-K的结构测定，对粉末XRD和化学分析数据进行评估，得出的结论是，磷纤维型与Murigite是同构的，并且代表Murigite-K系列中的缺碱成员。

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