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New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XV. Calciojohillerite, NaCaMgMg2(AsO4)3, a member of the alluaudite group
Mineralogical Magazine ( IF 2.7 ) Pub Date : 2021-01-14 , DOI: 10.1180/mgm.2021.2
Igor V. Pekov , Natalia N. Koshlyakova , Atali A. Agakhanov , Natalia V. Zubkova , Dmitry I. Belakovskiy , Marina F. Vigasina , Anna G. Turchkova , Evgeny G. Sidorov , Dmitry Yu. Pushcharovsky

The new alluaudite-group mineral calciojohillerite is one of the major arsenates in sublimates of the Arsenatnaya fumarole at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. In middle zones of the fumarole, calciojohillerite is associated with hematite, tenorite, johillerite, nickenichite, bradaczekite, badalovite, tilasite, lammerite, ericlaxmanite, aphthitalite-group sulfates, langbeinite, calciolangbeinite, anhydrite, sanidine, fluorophlogopite, fluoborite, cassiterite, pseudobrookite, rutile, sylvite and halite. In deep zones it occurs in association with anhydrite, diopside, hematite, svabite, berzeliite, schäferite, forsterite, magnesioferrite, ludwigite, rhabdoborite-group fluoroborates, powellite, baryte, fluorapatite, udinaite, arsenudinaite and paraberzeliite. Calciojohillerite forms prismatic crystals up to 1 cm long, their aggregates and crystal crusts up to 0.5 m2. It is transparent, colourless, pale green, pale yellow, light blue, pale lilac or pink, with vitreous lustre. The mineral is brittle, with imperfect cleavage. The Mohs hardness is 3½. Dcalc is 3.915 g cm–3. Calciojohillerite is optically biaxial (–), α = 1.719(3), β = γ = 1.732(3); 2Vmeas. = 15(10)°. Chemical composition (wt.%, electron-microprobe; holotype) is: Na2O 7.32, K2O 0.10, CaO 6.82, MgO 20.31, MnO 0.68, CuO 0.27, ZnO 0.02, Al2O3 0.56, Fe2O3 3.53, TiO2 0.01, SiO2 0.03, P2O5 1.25, V2O5 0.10, As2O5 58.77, SO3 0.13, total 99.90. The empirical formula based on 12 O atoms is (Na1.30K0.01Ca0.67Mg2.78Mn0.05Cu0.02Al0.06Fe3+0.24)Σ5.13(As2.83P0.10S0.01V0.01)Σ2.95O12. Calciojohillerite is monoclinic, C2/c, a = 11.8405(3), b = 12.7836(2), c = 6.69165(16) Å, β = 112.425(3)°, V = 936.29(4) Å3 and Z = 4. The crystal structure was solved from single-crystal X-ray diffraction data, R1 = 0.0227. Calciojohillerite is isostructural with other alluaudite-group minerals. Its simplified crystal chemical formula is A(1)CaA(1)′A(2)A(2)′NaM(1)MgM(2)Mg2(AsO4)3 (□ = vacancy). The idealised formula is NaCaMg3(AsO4)3, or, according to the nomenclature of alluaudite-group arsenates, NaCaMgMg2(AsO4)3. Calciojohillerite is named as an analogue of johillerite NaCu2+MgMg2(AsO4)3 with species-defining Ca instead of Cu in the ideal formula.



中文翻译:

来自俄罗斯堪察加半岛Tolbachik火山Arsenatnaya fumarole的新砷酸盐矿物。XV。钙钙长石,NaCaMgMg2(AsO4)3,钙铝榴石组的成员

新的别称矿物族钙钙锰铁矿是位于俄罗斯堪察加半岛的托尔巴奇克火山大突破北部爆发的第二个火山口锥体上的砷化砷岩中升华的主要砷化物之一。在喷气孔的中部地区,钙钛铁矾与赤铁矿,锰铁矿,辉铁矿,镍镍矿,辉铜矿,巴达洛石,钛铁矿,拉美铁矿,钙锰矿,磷灰石族硫酸盐,朗贝铁矿,钙钛铝矾石,硬石膏,氟硅石,氟硅钙石,氟硅钙石,氟硅钙石,氟硅铝石,氟硅铝石金红石,钾盐和石盐。在深部地区,它与硬石膏,透辉石,赤铁矿,巴氏石,辉绿铁矿,schäferite,镁橄榄石,镁铁铁矿,路德维希石,斜纹硼铁矿类氟硼酸盐,弹孔石,重晶石,氟磷灰石,udinaite,砷铝锰矿和滑石粉。钙钙长石形成长至1 cm长的棱柱形晶体,其聚集体和晶体结壳长至0.5 m2。它是透明的,无色,浅绿色,浅黄色,浅蓝色,淡紫色或粉红色,具有玻璃光泽。矿物易碎,解理不完善。莫氏硬度为3½。D calc为3.915 g cm –3。钙矾石是光学双轴(–),α= 1.719(3),β=γ= 1.732(3);2V测量 = 15(10)°。化学成分(wt。%,电子-微探针;整型)为:Na 2 O 7.32,K 2 O 0.10,CaO 6.82,MgO 20.31,MnO 0.68,CuO 0.27,ZnO 0.02,Al 2 O 3 0.56,Fe 2 O 3 3.53,TiO 2 0.01,SiO 2 0.03,P 2 O 51.25,V 2 O 5 0.10,As 2 O 5 58.77,SO 3 0.13,总计99.90。根据12个O原子的经验式是(钠1.30 ķ 0.01的Ca 0.67 Mg的2.780.050.020.06的Fe 3+ 0.24Σ5.13(如2.83 P 0.10 š 0.01 V 0.01Σ2.95 Ö 12。钙钙长石为单斜晶系,C 2 / ca= 11.8405(3),b = 12.7836(2),C ^ = 6.69165(16)α,β= 112.425(3)°,V = 936.29(4)3Ž = 4的晶体结构从单解决晶体X射线衍射数据,R 1= 0.0227。钙钙长石与其他别铝质族矿物是同构的。其简化的晶体化学式为A(1) Ca A(1)'A(2)A(2)' Na M(1) Mg M(2) Mg 2(AsO 43(□=空缺)。理想化的配方为NaCaMg 3(AsO 43,或者根据变钙铝石型砷酸盐的命名法为NaCaMgMg 2(AsO 43。钙钙长石被命名为钠长石NaCu 2+ MgMg 2(AsO 43的类似物,在理想的配方中用物种定义了Ca而不是Cu。

更新日期:2021-01-14
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