Potassic-magnesio-arfvedsonite, KNa2(MgFe2+Fe3+)5Si8O22(OH)2: mineral description and crystal chemistry
Potassic-magnesio-arfvedsonite, KNa2(MgFe2+Fe3+)5Si8O22(OH)2: mineral description and crystal chemistry
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钾镁铝镁石，KNa2(MgFe2 Fe3 )5Si8O22(OH)2：矿物描述和晶体化学
DOI：
10.1180/mgm.2018.135
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发表时间：
2018
影响因子：
2.7
通讯作者：
V. Rusanov
中科院分区：
文献类型：
--
作者：
M. Dyulgerov;R. Oberti;B. Platevoet;M. Kadiyski;V. Rusanov
摘要钾镁钠闪石是角闪石超群的一个新物种，最近获得批准（IMA 2016 -083），利用电子探针分析（EMPA）、激光烧蚀电感耦合等离子体质谱、单晶结构精修、穆斯堡尔和拉曼光谱以及光学和物理性质的测量，提供了钾镁钠闪石的完整矿物描述。正模标本发现于保加利亚Buhovo-Seslavtsi岩体的正长岩和花岗质岩墙中，并与石英、钾长石和霓辉石共生。钾镁钠铁闪石属单斜晶系，C2/m，晶胞参数：a = 9.9804（11），B = 18.0127（19），c = 5.2971（6）°，β = 104.341（2）°，V = 922.61 ° 3。在透射平面偏振光（λ = 590 cm-1）下，钾镁钠铁闪石呈多色性：X =黄色-浅绿色，Y =绿色，Z =深紫褐色。它是双轴的（-），α = 1.645（2），β = 1.655（2），γ = 1.660（2）和2 Vmeas。= 60°和2 Vcalc. = 70°。由EMPA和结构精修获得的经验单位式为A（K0.86Na0.0.08）0.94B（Na1.74Ca0.25Mn2 +0.01）2.00C（Mg2.67Fe2+1.42Fe3+0.76Ti0.12Mn2+0.03）5.00TSi8O22W（OH1.58F0.22O0.20）2.00。Fe 3 +/Fetot比（0.35）与穆斯堡尔谱和单晶结构细化一致。10个最强X射线粉末反射[d值（以A°计），I，（hkl）]为：8.519，80.5，（110）; 3.402，67.3，（131）; 3.295，41.0，（240）; 3.173，65.0，（310）; 2.752，35.6，（$\bar{3}$31）; 2.715，100.0（151）; 2.591，44.1，（061）; 2.542，73.2，（$\bar{2}$02）; 2.348，38.5，（$\bar{3}$51）; 2.174，42.0，（261）。钾镁钠铁闪石是强过碱性和钾质（过钾质）岩浆成分的产物。微量元素分析表明，角闪石对结晶过碱性岩浆中微量元素的分布没有明显的控制作用。
Abstract The complete mineral description of potassic-magnesio-arfvedsonite, a recently approved (IMA2016-083) new species of the amphibole supergroup is provided using electron microprobe analysis (EMPA), laser ablation inductively coupled plasma mass spectrometry, single-crystal structure refinement, Mössbauer and Raman spectroscopy, as well as measurement of optical and physical properties. The holotype material was found in syenitic and granitic dyke rocks in association with quartz, potassium feldspar and aegirine–augite from the Buhovo–Seslavtsi pluton, Bulgaria. Potassic-magnesio-arfvedsonite is monoclinic C2/m, with unit-cell parameters: a = 9.9804(11), b = 18.0127(19), c = 5.2971(6) Å, β = 104.341(2)° and V = 922.61 Å3. In transmitted plane-polarised light (λ = 590 cm–1), potassic-magnesio-arfvedsonite is pleochroic: X = yellow pale-green, Y = green and Z = dark-violet brown. It is biaxial (–), α = 1.645(2), β = 1.655(2), γ = 1.660(2) and 2Vmeas. = 60° and 2Vcalc. = 70°. The empirical unit formula obtained from EMPA and structure refinement is A(K0.86Na0.0.08)0.94B(Na1.74Ca0.25 Mn2+0.01)2.00C(Mg2.67Fe2+1.42Fe3+0.76Ti0.12Mn2+0.03)5.00TSi8O22W(OH1.58F0.22O0.20)2.00. The Fe3+/Fetot ratio (0.35) is consistent with both the Mössbauer spectra and the single-crystal structure refinement. The 10 strongest X-ray powder reflections [d values (in A°), I, (hkl)] are: 8.519, 80.5, (110); 3.402, 67.3, (131); 3.295, 41.0, (240); 3.173, 65.0, (310); 2.752, 35.6, ($\bar{3}$31); 2.715, 100.0 (151); 2.591, 44.1, (061); 2.542, 73.2, ($\bar{2}$02); 2.348, 38.5, ($\bar{3}$51); 2.174, 42.0, (261). Potassic-magnesio-arfvedsonite is the product of strongly peralkaline and potassic (perpotassic) magma compositions. Trace-element analysis shows that this amphibole did not exert significant control on trace-element distribution in the crystallising peralkaline magma.
Potassicleakeite，一种新的角闪石，来自日本岩手县 Tanohata 矿。
DOI：
--
发表时间：
2002
期刊：
Journal of Mineralogical and Petrological Sciences 97
影响因子：
--
作者：
S.Matsubara;R.Miyawaki;M.Kurosawa;Y.Suzuki
通讯作者：
Y.Suzuki