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首页> 外文期刊>Indian medical journal >Ziminaite, Fe 3+ VO 4 , a new howardevansite-group mineral from the Bezymyannyi volcano, Kamchatka, Russia
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Ziminaite, Fe 3+ VO 4 , a new howardevansite-group mineral from the Bezymyannyi volcano, Kamchatka, Russia

机译:Ziminaite,Fe 3+ Vo 4,新的Howardevansite-Group矿物质来自Bezymyannyi火山,俄罗斯堪察加

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摘要

The new mineral ziminaite, ideally Fe_(3+)VO~(4), was found in fumarole sublimates at the Bezymyannyi volcano, Kamchatka, Russia. Ziminaite occurs as lamellar, tabular or flattened prismatic crystals up to 10?×?30?×?50?μm typically epitaxially overgrowing koksharovite, and as aggregates (up to 0.15?mm) associated with bannermanite in cavities in volcanic scoria. The mineral is translucent, yellowish-brown with an adamantine luster. The calculated density is 3.45?g cm_(??3). In reflected light, ziminaite is light grey. Bireflectance is weak, internal reflections are deep yellow. The reflectance values [ R ~(max) –R ~(min), % (λ, nm)] are: 17.7–16.3 (470), 15.7–14.1 (546), 15.1–13.8 (589), 14.7–13.6 (650). Chemical composition (wt%) is: MgO 2.20, CaO 0.01, Al~(2)O~(3)7.81, Fe~(2)O~(3)27.18, TiO~(2)4.50, SiO~(2)0.26, P~(2)O~(5)0.09, V~(2)O~(5)57.01, total 99.06. The empirical formula, based on 24 O atoms, is: (Fe_(3?+)?~(3.29)Al~(1.48)Ti~(0.54)Mg~(0.53))~(Σ5.84)(V~(6.05)Si~(0.04)P~(0.01))~(Σ6.10)O~(24)(Z?=?1). Ziminaite is triclinic, P $$overline {1}$$ 1 ˉ , a 8.012(4), b 9.345(5), c 6.678(3) ?, α 106.992(10), β 101.547(8), γ 96.594(11)o, V 460.4(4) ?_(3), Z?=?6. The strongest reflections of the powder X-ray diffraction pattern [ d ,?( I )( hkl )] are: 3.751(17)(1–21, 12???1), 3.539(86)(120), 3.270(67)(01–2), 3.209(100)(2–20), 3.090(20)(2–11, 002), 3.041(18)(03???1, 02–2), 2.934(14)(12???2, 030) and 1.665(24)(023, 12???4). The crystal structure, solved from single-crystal data ( R ~(1)?=?0.085), is based upon heteropolyhedral framework built by VO~(4)tetrahedra and Fe_(3+)-centred octahedra and five-fold polyhedra. Ziminaite belongs to the howardevansite group being its first member without species-defining uni- or divalent cations and with all large cation sites vacant. The mineral is named after the Zimina volcano situated near the discovery locality.
机译:新的矿物杂志,理想情况下Fe_(3+)Vo〜(4)被发现在Bezymyannyi火山,Kamchatka,俄罗斯的富马拉升华峰。 Ziminaite作为层状,片状或扁平的棱镜晶体,最高可达10?×30?×50?50?μm通常外延超越Koksharovite,以及与火山孢子中的空腔中的腔内相关的聚集体(高达0.15Ωmm)。矿物质是半透明的,黄褐色,带有金刚石光泽。计算的密度为3.45Ω·g cm _(?? 3)。在反射光中,Ziminaite是浅灰色的。 Bireflectance弱,内部反射深黄。反射值[r〜(max)-r〜(min),%(λ,nm)]是:17.7-16.3(470),15.7-14.1(546),15.1-13.8(589),14.7-13.6( 650)。化学成分(WT%)是:MgO 2.20,CaO 0.01,Al〜(2)O〜(3)7.81,Fe〜(2)O〜(3)27.18,TiO〜(2)4.50,SiO〜(2) 0.26,P〜(2)O〜(5)0.09,V〜(2)O〜(5)57.01,总计99.06。基于24 o原子的经验配方是:(Fe_(3?+)?〜(3.29)Al〜(1.48)Ti〜(0.54)mg〜(0.53))〜(σ5.84)(V〜( 6.05)Si〜(0.04)P〜(0.01))〜(Σ6.10)O〜(24)(z?=?1)。 Ziminaite是Triclinic,P $$ overline {1} $$ 1ˉ,8.012(4),b 9.345(5),C 6.678(3)?,α106.992(10),β101.547(8),γ96.594 (11)o,v 460.4(4)?_(3),z?=?6。粉末X射线衍射模式的最强反射[D,α(I)(HKL)]是:3.751(17)(1-21,12→1),3.539(86)(120),3.270( 67)(01-2),3.209(100)(2-20),3.090(20)(2-11,002),3.041(18)(03 ??? 1,02-2),2.934(14) (12 ??? 2,030)和1.665(24)(023,12 ??? 4)。从单晶数据解决的晶体结构(R〜(1)?= 0.085),基于由VO〜(4)四面体和Fe_(3 +) - 以中心的八面体和五折的多面体建造的杂交肾上腺框架。 Ziminaite属于Howardevansite集团是它的第一个成员,没有物种定义单一或二价阳离子,并且所有大型阳离子网站空置。矿物质以Zimina Volcano靠近发现的地方的命名。

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