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首页> 外文期刊>The American mineralogist >Pavlovskyite Ca8(SiO4)2(Si3O10): A new mineral of altered silicate-carbonate xenoliths from the two Russian type localities, Birkhin massif, Baikal Lake area and Upper Chegem caldera, North Caucasus
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Pavlovskyite Ca8(SiO4)2(Si3O10): A new mineral of altered silicate-carbonate xenoliths from the two Russian type localities, Birkhin massif, Baikal Lake area and Upper Chegem caldera, North Caucasus

机译：Pavlovskyite Ca8（SiO4）2（Si3O10）：一种来自两个俄罗斯类型地区Birkhin地块，贝加尔湖地区和北高加索地区上部Chegem破火山口的硅酸盐-碳酸盐异种岩蚀变的新矿物

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摘要

The new mineral pavlovskyite Ca _8(SiO _4) _2(Si _3O _(10)) forms rims together with dellaite Ca _6(Si _2O _7)(SiO _4)(OH) _2 around galuskinite Ca _7(SiO _4) _3CO _3 veins cutting calcio-olivine skarns in the Birkhin gabbro massif. In addition, skeletal pavlovskyite occurs in cuspidine zones of altered carbonate xenoliths in the ignimbrites of the Upper Chegem caldera (North Caucasus). The synthetic analog of pavlovskyite has been synthesized before and is known from cement-like materials. Isotypic to pavlovskyite is the synthetic germanate analog Ca _8(GeO _4) _2(Ge _3O _(10)). The crystal structure of pavlovskyite, space group Pbcn, a = 5.0851(1), b = 11.4165(3), c = 28.6408(8) A°, V = 1662.71(7) A° 3, Z = 4, has been refined from X-ray single-crystal data to R1 = 3.87%. The new colorless mineral has a Mohs hardness of 6-6.5, biaxial (-), α = 1.656(2), β = 1.658(2), γ = 1.660(2) (589 nm), 2V (meas) = 80(5)°, 2V (calc) = 89.9°, medium dispersion: r > v, optical orientation: X = b, Y = c, Z = a. For comparison with pavlovskyite, the crystal structure of kilchoanite Ca _6(SiO _4)(Si _3O _(10)) from the Birkhin massif [space group I2cm, a = 11.4525(2), b = 5.0867(1), c = 21.996(3) A°, V = 1281.40(4) A°3, Z = 4] has been refined from single-crystal X-ray data to R1 = 2.00%. Pavlovskyite represents a 1:1 member of a polysomatic series with calcio-olivine γ-Ca _2SiO _4 and kilchoanite Ca _6(SiO _4)(Si _3O _(10)) as end-member modules. The structure is characterized by strongly folded trisilicate units (Si _3O _(10)) interwoven with a framework of CaO _6 and CaO _8 polyhedra. Olivine-like slices with orthosilicate groups are interstratified with the characteristic trisilicate module of Ca _4(Si _3O _(10)) composition. Although the optical properties of pavlovskyite and kilchoanite are similar, both minerals can be distinguished by chemical analyses (different Ca/Si ratio), X-ray diffraction, and Raman spectroscopy. The new mineral is named after V.E. Pavlovsky (1901-1982), an outstanding geologist in the area of Eastern Siberia, in particular of the Baikal region.
机译：新的矿物pavlovskyite Ca _8（SiO _4）_2（Si _3O _（10））与钙铝石Ca _7（SiO _4）_3CO _3脉周围的dellaite Ca _6（Si _2O _7）（SiO _4）（OH）_2一起形成轮辋在Birkhin gabbro地块切割钙橄榄石矽卡岩。此外，骨架的pavlovskyite出现在上部Chegem破火山口（北高加索地区）的火成岩中，碳酸盐异种岩的改变的cuspidine带中。帕夫洛夫斯基的合成类似物以前已经合成，并且从类似水泥的材料中已知。与pavlovskyite的同型是合成的德国类似物Ca _8（GeO _4）_2（Ge _3O _（10））。精炼的pavlovskyite的晶体结构，空间群Pbcn，a = 5.0851（1），b = 11.4165（3），c = 28.6408（8）A°，V = 1662.71（7）A°3，Z = 4，从X射线单晶数据到R1 = 3.87％。新型无色矿物的莫氏硬度为6-6.5，双轴（-），α= 1.656（2），β= 1.658（2），γ= 1.660（2）（589 nm），2V（meas）= 80（ 5）°，2V（计算）= 89.9°，介质色散：r> v，光学方向：X = b，Y = c，Z = a。为了与pavlovskyite进行比较，来自Birkhin地块[空间群I2cm，a = 11.4525（2），b = 5.0867（1），c = 21.996]的方钴矿Ca _6（SiO _4）（Si _3O _（10））的晶体结构（3）A°，V = 1281.40（4）A°3，Z = 4]已从单晶X射线数据细化为R1 = 2.00％。 Pavlovskyite代表多聚体系列的1：1成员，其中钙橄榄石γ-Ca_2SiO _4和方钴矿Ca _6（SiO _4）（Si _3O _（10））作为末端成员模块。该结构的特征是与CaO _6和CaO _8多面体的骨架交织的强折叠三硅酸盐单元（Si _3O _（10））。具有原硅酸盐基团的橄榄石状切片与Ca _4（Si _3O _（10））组成的特征性三硅酸盐模块互层。尽管pavlovskyite和kilchoanite的光学性质相似，但两种矿物都可以通过化学分析（不同的Ca / Si比），X射线衍射和拉曼光谱进行区分。新矿物以V.E.帕夫洛夫斯基（1901-1982），西伯利亚东部地区，特别是贝加尔湖地区的杰出地质学家。

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