Synthetic B-rich olenite: Correlations of single-crystal structural data
Synthetic B-rich olenite: Correlations of single-crystal structural data
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DOI：
10.2138/am.2012.4060
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发表时间：
2012-10-01
影响因子：
3.1
通讯作者：
Rossman, George R.
中科院分区：
文献类型：
--
作者：
Ertl, Andreas;Giester, Gerald;Rossman, George R.
伦敦（2011）描述的合成富Al和富B电气石晶体通过西姆斯和新的EMP分析进一步表征。这些碧玺是第一个通过单晶X射线衍射表征的合成富硼橄榄石，因为它们比过去生产的合成样品大得多。平均最终公式为（x）（Na-0.7平方（0.3））（Y）（Al2.5Li0.4Fe0.12+）Al-z（6）（BO3）（3）[Si5.2B0.5Al0.3O18]（v）[（OH）（2.9）O-0.1]（w）[O-0.9（OH）（0.1）]，其中a = 15.765（1），c = 7.083（1）埃，（十）（Na-0.7平方（0.3））（Y）（Al2.5Li0.5）Al-z（6）（BO3）（3）[Si4.8B0.9Al0.3O18]（v）（OH）（3）（w）[（OH）（0.5）O-0.5]，其中a = 15.746（1），c = 7.075（1）埃，并且（x）（Na0.6Ca0.1平方（0.3））（Y）（Al2.3Li0.5Fe0.2）Al-z（6）（BO 3）（3）[Si4.7B1.2Al0.2O18]（v）（OH）（3）（w）[（OH）（0.9）O-0.1]，其中a = 15.723（1），c = 7.068（1）埃。小的< T-O >距离，低至1.599埃，反映了相对较高的B-[4]量（高达1.2 apfu; R =近似2%的细化）。所有这些样品还含有大量的Al-[4]（类似于0.2 apfu）。在这些合成的斜长岩中，发现晶体生长过程中的温度（在恒定压力下）与B-[4]（来自精炼）之间存在明显的负相关性（r（2）= 1.00;只有三个数据点）。
Synthetic Al- and B-rich tourmaline crystals described by London (2011) were characterized further by SIMS and new EMP analyses. These tourmalines are the first synthetic B-rich olenites characterized by single-crystal X-ray diffraction, because they are significantly larger than synthetic samples produced in the past. The average final formulas are (x)(Na-0.7 square(0.3))(Y)(Al2.5Li0.4Fe0.12+) Al-z(6)(BO3)(3)[Si5.2B0.5Al0.3O18](v)[(OH)(2.9)O-0.1](w)[O-0.9(OH)(0.1)], with a = 15.765(1), c = 7.083(1) angstrom, (x)(Na-0.7 square(0.3)) (Y)(Al2.5Li0.5)Al-z(6)(BO3)(3)[Si4.8B0.9Al0.3O18](v)(OH)(3)(w)[(OH)(0.5)O-0.5], with a = 15.746(1), c = 7.075(1) angstrom, and (x)(Na0.6Ca0.1 square(0.3))(Y)(Al2.3Li0.5Fe0.2)Al-z(6)(BO3)(3)[Si4.7B1.2Al0.2O18](v)(OH)(3)(w)[(OH)(0.9)O-0.1], with a = 15.723(1), c = 7.068(1) angstrom. The small < T-O > distances, down to 1.599 angstrom, reflect relatively high amounts of B-[4] (up to 1.2 apfu; refinements with R = similar to 2%). All these samples also contain significant amounts of Al-[4] (similar to 0.2 apfu). A pronounced negative correlation (r(2) = 1.00; only three data points) between temperature during crystal growth (at a constant pressure) and B-[4] (from refinement) in these synthetic olenites was found.