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首页> 外文期刊>European journal of mineralogy >Crystal structure and chemistry of lithium-bearing trioctahedral micas-3T
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Crystal structure and chemistry of lithium-bearing trioctahedral micas-3T

机译：含锂三八面体云母3T的晶体结构与化学

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Chemical analyses and crystal structure refinements were performed on lithian siderophyllite-3T crystals from granitic pegmatites of the anorogenic Pikes Peak batholith (Colorado) to characterize the crystal chemistry and relations with trioctahedral lithium-bearing micas showing different stacking sequences. Chemical data show that the studied samples fall on the siderophyllite-polylithionite join, closer to the siderophyllite end-member. Single-crystal X-ray refinements were carried out on three samples (two of which were taken from core and rim of the same crystal) in space-group P3_112 (the agreement factor, R_(obs), varies between 0.034 and 0.036). Mean bond distances and mean electron counts of M1, M2 and M3 octahedral sites indicate an ordered cation distribution with M1 and M3 positions substantially larger than M2. In the sample with the largest iron content, the M2 mean electron count increases as well as the mean distance, whereas remains smaller than or . The tetrahedral cation-oxygen atom mean distances range from 1.614 to 1.638 A and from 1.663 to 1.678 A for T1 and T2 sites, respectively, being consistent with Al~(3+) enrichment in the T2 sites. The tetrahedral rotation angle, α, is generally small (3.1 ≤ α ≤ 4.6°) and decreases with siderophyllite content. As Fe increases, the T1 tetrahedron becomes flatter (112.4 ≤ τ_(T1) ≤ 110.5°), whereas T2 tetrahedron distortion appears unchanged (110.7 ≤ τ_(T2) ≤ 110.9).
机译：对来自致雄性派克峰岩基（科罗拉多州）的花岗岩伟晶岩的锂铁橄榄石3T晶体进行化学分析和晶体结构优化，以表征晶体化学性质以及与三面体含锂云母的关系，从而显示不同的堆积顺序。化学数据显示，所研究的样品落在铁硼铁矿-聚锂铁矿的连接点上，更靠近铁铁光伏石的末端。在空间群P3_112（一致性因子R_（obs）在0.034和0.036之间变化）中对三个样本（其中两个取自同一晶体的核和边缘）进行了单晶X射线细化。 M1，M2和M3八面体位点的平均键距和平均电子数表明有序的阳离子分布，其中M1和M3的位置明显大于M2。在铁含量最大的样品中，M2平均电子计数以及平均距离均增加，而保持小于或。 T1和T2位点的四面体阳离子-氧原子平均距离分别为1.614至1.638 A和1.663至1.678 A，与T2位点的Al〜（3+）富集一致。四面体旋转角α通常很小（3.1≤α≤4.6°），并随铁橄榄石含量的增加而减小。随着Fe的增加，T1四面体变得更平坦（112.4≤τ_（T1）≤110.5°），而T2四面体的畸变显得没有变化（110.7≤τ_（T2）≤110.9）。

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