Herderite from Mogok, Myanmar, and comparison with hydroxyl-herderite from Ehrenfriedersdorf, Germany
Herderite from Mogok, Myanmar, and comparison with hydroxyl-herderite from Ehrenfriedersdorf, Germany
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产自缅甸摩谷的水硬石，以及与产自德国埃伦弗里德斯多夫的羟基水硬石的比较
DOI：
10.2138/am.2008.2943
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发表时间：
2008
影响因子：
3.1
通讯作者：
F. Hawthorne
中科院分区：
文献类型：
--
作者：
G. Harlow;F. Hawthorne
文摘磷铍钙石的晶体结构,CaBePO4 [F0.75 (OH) 0.25], a = 9.7446 (4), b = 7.6769 (3), c = 4.7633(2),β= 90.667(1)°,V = 356.31 (4) A3, P21 /,和Z = 4,从Mogok石头,缅甸,和hydroxyl-herderite CaBePO4 [0.52 (OH) f0.48] = 9.7615 (4), b = 7.6680 (3), c = 4.7853(2),β= 90.184(1)°,V = 358.18 (4) A3, P21 /,和Z = 4,从Sauberg, Morgenrother楚格,Ehrenfriedersdorf,德国已精制R1指数为1.7%,在这两种情况下,利用MoKα单晶x射线衍射数据。木谷的绿柱石与复杂的稀有元素绿柱石型花岗伟晶岩伴生。大多数菱铁矿系列矿物是花岗岩伟晶岩演化晚期过程的产物，通常是结晶后的溶出流体，这些流体中显著的f富集似乎导致菱铁矿优于羟基菱铁矿。现在在缅甸的Mogok有记录的Herderite；Yichung,中国;巴西;可能还有纳米比亚的埃隆戈。德国Ehrenfriedersdorf的伟晶岩在herderite和hydroxy- herderite之间产生了样品，如果不可能也是herderite的话。
Abstract The crystal structures of herderite, CaBePO4[F0.75(OH)0.25], a = 9.7446(4), b = 7.6769(3), c = 4.7633(2) Å, β = 90.667(1)°, V = 356.31(4) Å3, P21/a, and Z = 4, from the Mogok Stone Tract, Myanmar, and hydroxyl-herderite, CaBePO4[(OH)0.52F0.48], a = 9.7615(4), b = 7.6680(3), c = 4.7853(2) Å, β = 90.184(1)°, V = 358.18(4) Å3, P21/a, and Z = 4, from the Sauberg mine, Morgenröther Zug, Ehrenfriedersdorf, Germany, have been refined to R1 indices of 1.7%, in both cases, using MoKα single-crystal X-ray diffraction data. Herderite from Mogok is associated with complex rare-element beryl-type granite pegmatite. Most herderite-series minerals are the product of late-stage processes in granite pegmatite evolution, typically of an exsolved fluid upon crystallization, and significant F-enrichment in these fluids appears to result in the domination of herderite over hydroxyl-herderite. Herderite is now documented from Mogok, Myanmar; Yichung, China; Brazil; and probably Erongo, Namibia. The pegmatites at Ehrenfriedersdorf, Germany have produced samples at the boundary between herderite and hydroxyl-herderite, if not possibly herderite as well.