阿根廷拉里奥哈马兹山硅碳酸盐岩脉中一个新的斜斜角闪石

IF 2.8 3区地球科学 Q2 MINERALOGY

Mineralogical Magazine Pub Date : 2023-01-19 DOI:10.1180/mgm.2023.2

F. Colombo, J. Rius, E. Molins, Héctor Biglia, M. A. Galliski, M. F. Márquez-Zavalía, E. Baldo, Agustín Kriscautzky

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引用次数: 1

摘要

摘要:在阿根廷La Rioja省Sierra de Maz的硅碳酸盐岩脉中发现了铁铁-铁铁- katoporite (IMA2016-008)，理想情况下为Na(NaCa)(Fe2+4Fe3+)(Si7Al)O22(OH)2，为长达3cm的异晶，并在埃吉-奥辉石周围形成替代环。铁-铁-卡托菲石呈黑色，具有玻璃状光泽和淡绿色条纹。这种新矿物易碎，具有完美的{110}解理，莫氏硬度为6。测得密度为3.32(1)g/cm3。在平面偏振光下，它具有强烈的多色性，X =浅绿棕色，Y =深灰棕色，Z =深灰橄榄绿色。吸收(很强)为Z > Y > X，取向为:Z∥b, X与[001]成小角。铁铁katophorite呈双轴(-)型，α = 1.688(3)， β = 1.697(3)， γ = 1.698(3)， 2V(calc) = 36.7°。它是单斜的，空间群C2/m, a = 9.8270(7)， b = 18.0300(8)， c = 5.316(4) Å， β = 104.626(4)°，V = 911.4(6) Å3, Z = 2。粉末x射线衍射图中最强的五条线[d在Å (I)(hkl)中]分别是:8.416(100)(110)、3.135(50)(310)、2.815(26)(330)、2.720(18)(151)和1.4422(15)($\bar{6}$61)。化学成分为SiO2 43.08、TiO2 2.76、ZrO2 0.15、Al2O3 8.76、V2O3 0.07、Fe2O3 9.28、FeO 13.85、MnO 0.43、MgO 6.88、CaO 6.58、ZnO 0.06、Na2O 5.55、K2O 1.18、Cl 0.01、H2O calc 1.36，总wt %为99.95。经单晶结构分析确认的分子式单位为(Na0.74K0.23)Σ0.97(Ca1.08Na0.91Mn0.01)Σ2.00(Fe2+1.78Mg1.57Fe3+1.07Ti4+0.32Al0.19Mn2+0.04Zr0.01V3+0.01Zn0.01)Σ5.00(Si6.61Al1.39)Σ8.00O22(OH1.59O0.61)Σ2.00。铝在T(1)位点是强有序的。铁铁-铁铁- katoporite是第9个具有katoporite词根名称的物种，与katoporite通过Fe2+ + Fe3+→Mg2+ + Al3+取代关系。样板材料存放在阿根廷Córdoba国立大学Mineralogía“Stelzner”博物馆，目录号为MS003341。

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Ferro-ferri-katophorite, a new clinoamphibole from the silicocarbonatite dykes in Sierra de Maz, La Rioja, Argentina

Abstract Ferro-ferri-katophorite (IMA2016–008), ideally Na(NaCa)(Fe2+4Fe3+)(Si7Al)O22(OH)2, was found as xenocrysts up to 3 cm long and replacement rims around aegirine–augite in silicocarbonatite dykes cropping out in the Sierra de Maz, La Rioja province, NW Argentina. Ferro-ferri-katophorite is black and has vitreous lustre and a pale green streak. The new mineral is brittle, with perfect {110} cleavage and has a Mohs hardness of 6. The measured density is 3.32(1) g/cm3. In plane-polarised light it is strongly pleochroic, X = light greenish brown, Y = dark greyish brown and Z = dark greyish olive green. Absorption (very strong) is Z > Y > X. The orientation is: Z ∥ b, and X forms a small angle with [001]. Ferro-ferri-katophorite is biaxial (–), with α = 1.688(3), β = 1.697(3), γ = 1.698(3) and 2V(calc) = 36.7°. It is monoclinic, space group C2/m, a = 9.8270(7), b = 18.0300(8), c = 5.316(4) Å, β = 104.626(4)°, V = 911.4(6) Å3 and Z = 2. The strongest five lines in the powder X-ray diffraction pattern [d in Å (I)(hkl)] are: 8.416(100)(110), 3.135(50)(310), 2.815(26)(330), 2.720(18)(151) and 1.4422(15)($\bar{6}$61). The chemical composition is SiO2 43.08, TiO2 2.76, ZrO2 0.15, Al2O3 8.76, V2O3 0.07, Fe2O3 9.28, FeO 13.85, MnO 0.43, MgO 6.88, CaO 6.58, ZnO 0.06, Na2O 5.55, K2O 1.18, Cl 0.01, H2O calc 1.36, total 99.95 wt.%. The formula unit (confirmed by single-crystal structural analysis) is (Na0.74K0.23)Σ0.97(Ca1.08Na0.91Mn0.01)Σ2.00(Fe2+1.78Mg1.57Fe3+1.07Ti4+0.32Al0.19Mn2+0.04Zr0.01V3+0.01Zn0.01)Σ5.00(Si6.61Al1.39)Σ8.00O22(OH1.59O0.61)Σ2.00. Aluminium is strongly ordered at the T(1) site. Ferro-ferri-katophorite is the 9th species carrying the katophorite root name and is related to katophorite by the Fe2+ + Fe3+ → Mg2+ + Al3+ substitution. Type material was deposited at the Museo de Mineralogía “Stelzner”, Universidad Nacional de Córdoba, Argentina, under catalogue number MS003341.

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来源期刊

Mineralogical Magazine 地学-矿物学

CiteScore

4.00

自引率

25.90%

发文量

104

审稿时长

6-12 weeks

期刊介绍： Mineralogical Magazine is an international journal of mineral sciences which covers the fields of mineralogy, crystallography, geochemistry, petrology, environmental geology and economic geology. The journal has been published continuously since the founding of the Mineralogical Society of Great Britain and Ireland in 1876 and is a leading journal in its field.