Unusual forms of magnetite in the Orgueil carbonaceous chondrite
Unusual forms of magnetite in the Orgueil carbonaceous chondrite
复制标题
奥盖尔碳质球粒陨石中异常形式的磁铁矿
DOI：
10.1111/j.1945-5100.1998.tb01335.x
复制
发表时间：
1998
影响因子：
2.2
通讯作者：
P. Buseck
中科院分区：
文献类型：
--
作者：
X. Hua;P. Buseck
翻译后摘要-Orgueil CI碳质球粒陨石含有磁铁矿（Fe 3 O 4），显示丰富的和看似独特的各种形态。虽然已经描述了许多，但最近的图像提供了更大的清晰度，因此，提供了更明确的单八面体晶体和可能的三八面体形式的识别。虽然它是一种非常丰富的陆地矿物，通常存在于发育良好的晶体中，但这些形式都没有从磁铁矿中识别出来。磁铁矿盘（“斑块”）的桶形阵列也是独特的。看起来，这些不寻常的晶体形成的环境似乎有些特殊。它们的形态和与硫酸盐和碳酸盐的关联表明了水的起源。
Abstract— The Orgueil CI carbonaceous chondrite contains magnetite (Fe3O4) that displays a rich and seemingly unique variety of morphologies. While many have already been described, recent images provide far greater definition and, thus, provide more unambiguous identification of trapezohedral crystals and possibly also trisoctahedral forms. Although it is an extremely abundant terrestrial mineral and commonly occurs in well‐developed crystals, neither of these forms have been recognized previously from magnetite. The barrel‐shaped arrays of magnetite discs (“plaquettes”) are also unique. It appears as if the circumstances for the formation of these unusual crystals were somehow exceptional. Their morphologies and association with sulfates and carbonates suggest an aqueous origin.