Dutrowite, Na(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3O, a new mineral from the Apuan Alps (Tuscany, Italy): the first member of the tourmaline supergroup with Ti as a species-forming chemical constituent

IF 1.8 3区地球科学 Q2 MINERALOGY

European Journal of Mineralogy Pub Date : 2023-02-10 DOI:10.5194/ejm-35-81-2023

C. Biagioni, F. Bosi, D. Mauro, H. Skogby, A. Dini, F. Zaccarini

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Abstract

Abstract. The new tourmaline supergroup mineral dutrowite, Na(Fe2.52+Ti0.5)Al6(Si6O18)(BO3)3(OH)3O, has been discovered in an outcrop of a Permian metarhyolite near the hamlet of Fornovolasco, Apuan Alps, Tuscany, Italy. It occurs as chemically homogeneous domains, up to 0.5 mm, brown in colour, with a light-brown streak and a vitreous lustre, within anhedral to subhedral prismatic crystals, up to 1 mm in size, closely associated with Fe-rich oxy-dravite. Dutrowite is trigonal, space group R3m, with a=15.9864(8), c=7.2187(4) Å, V=1597.68(18) Å3, and Z=3. The crystal structure was refined to R1=0.0257 for 1095 unique reflections with Fo>4σ (Fo) and 94 refined parameters. Electron microprobe analysis, coupled with Mössbauer spectroscopy, resulted in the empirical structural formula X(Na0.81Ca0.20K0.01)Σ1.02 Y(Fe1.252+Mg0.76Ti0.56Al0.42)Σ3.00 Z(Al4.71Fe0.273+V0.023+Mg0.82Fe0.182+)Σ6.00 T[(Si5.82Al0.18)Σ6.00O18] (BO3)3O(3)(OH)3O(1)[O0.59(OH)0.41]Σ1.00, which was recast in the empirical ordered formula, required for classification purposes: X(Na0.81Ca0.20K0.01)Σ1.02 Y(Fe1.432+Mg1.00Ti0.56)Σ3.00 Z(Al5.13Fe0.273+V0.023+Mg0.58)Σ6.00 T[(Si5.82Al0.18)Σ6.00O18] (BO3)3V(OH)3 W[O0.59(OH)0.41]Σ1.00. Dutrowite is an oxy-species belonging to the alkali group of the tourmaline supergroup. Titanium is hosted in octahedral coordination, and its incorporation is probably due to the substitution 2Al3+ = Ti4+ + (Fe,Mg)2+. Its occurrence seems to be related to late-stage high-T/low-P replacement of “biotite” during the late-magmatic/hydrothermal evolution of the Permian metarhyolite.

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Dutrowite，Na（Fe2+2.5Ti0.5）Al6（Si6O18）（BO3）3（OH）3O，一种来自阿普安阿尔卑斯山脉（意大利托斯卡纳）的新矿物：电气石超群中第一个以Ti为物种形成化学成分的成员

摘要在意大利托斯卡纳阿普安阿尔卑斯福尔诺沃拉斯科哈姆莱托夫附近的二叠纪变质流纹岩露头中发现了新的电气石超群矿物dutrowite Na（Fe2.52+Ti0.5）Al6（Si6O18）（BO3）3（OH）3O。它以化学均匀结构域的形式出现，最高可达0.5 mm，棕色，有浅棕色条纹和玻璃光泽，在半自形到半自形棱柱晶体内，高达1 尺寸为mm，与富含Fe的氧化锌矿密切相关。Dutrowite istrigonal，空间群R3m，其中a=15.9864（8），c=7.2187（4） Å，V=1597.68（18） Å3和Z=3。对于1095次Fo>4σ（Fo）的独特反射和94个精细参数，晶体结构被精细化为R1=0.00257。电子探针分析，结合穆斯堡尔谱，得出经验结构式X（Na0.81Ca0.20K0.01）∑1.02Y（Fe1.252+Mg0.76Ti0.56Al0.42）∑3.00Z（Al4.71Fe0.273+V0.023+Mg0.82Fe0.0182+）∑6.00T[（Si5.82Al0.18）∑6.00O18]（BO3）3O（3）（OH）3O，分类所需：X（Na0.81Ca0.20K0.01）∑1.02 Y（Fe1.432+Mg1.00Ti0.56）∑3.00 Z（Al5.13Fe0.273+V0.023+Mg0.58）∑6.00 T[（Si5.82Al0.18）∑6.00O18]（BO3）3V（OH）3W[O0.59（OH）0.41]∑1.00。Dutrowite是属于电气石超群碱族的一种含氧物种。钛以八面体配位为主，其结合可能是由于取代2Al3+ = Ti4+ + （Fe、Mg）2+。它的出现似乎与二叠纪变质流纹岩晚期岩浆/热液演化过程中“黑云母”的晚期高T/低磷置换有关。

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来源期刊

European Journal of Mineralogy 地学-矿物学

CiteScore

2.80

自引率

9.50%

发文量

审稿时长

6-12 weeks

期刊介绍： EJM was founded to reach a large audience on an international scale and also for achieving closer cooperation of European countries in the publication of scientific results. The founding societies have set themselves the task of publishing a journal of the highest standard open to all scientists performing mineralogical research in the widest sense of the term, all over the world. Contributions will therefore be published primarily in English. EJM publishes original papers, review articles and letters dealing with the mineralogical sciences s.l., primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, but also biomineralogy, environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.

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