| 我国3种绿色图章石中白云母的矿物学特征 |
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| 引用本文： | 陈涛,韩文,李甜,皱倩.我国3种绿色图章石中白云母的矿物学特征[J].地球科学,2012,37(5):981-988. |
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| 作者姓名： | 陈涛 韩文 李甜 皱倩 |
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| 作者单位： | 1.中国地质大学珠宝学院, 湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金41172050国家自然科学基金40702007中国博士后面上基金20100480925 |
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| 摘 要： | 对我国浙江青田山炮绿、福建寿山月尾绿以及西安绿3种绿色图章石分别利用X射线衍射、电子探针、环境扫描电镜以及能谱分析对其矿物成分、化学成分、微形貌特征以及颜色成因等方面进行了研究.研究发现, 3种图章石的绿色部分均由具二八面体结构的2M1型多硅白云母组成, 属于云母型图章石; 它们的次要矿物组成中山炮绿含有白云石、黄铁矿和磷灰石, 月尾绿含有高岭石, 西安绿含有白云石, 次要矿物组成对绿色图章石的产地鉴定具有一定意义.3种白云母的微形貌特征揭示了西安绿中白云母结晶程度高于月尾绿中白云母, 而山炮绿中白云母经历热液蚀变后晶形不完整重结晶程度不高.另外, 白云母八面体层中杂质离子的化学成分分析表明, 月尾绿和西安绿中白云母的绿色是由Fe3+和Ti4+离子形成, 而山炮绿的翠绿颜色主要由白云母中Cr3+离子以及Fe3+、Ti4+离子共同作用形成.
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| 关 键 词： | 白云母 晶体结构 颜色成因 图章石 矿物学 |
| 收稿时间： | 2012-01-16 |
Mineralogy Characterization of Muscovite in Three Kinds of Green Sealed Stones from China |
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| Abstract: | Three kinds of seal stones from China, namely, Shan PaoLv (SPL) seal stone in Qingtian, Yue WeiLv (YWL) seal stone in Shoushan and newly found Xi AnLv (XAL) seal stone have been studied by X-ray diffractometer, electronic microprobe analyses, environmental scanning electron microscope, and energy dispersive spectroscopy to obtain their mineral composition, chemical composition, micro-morphology characterization, and cause of color formation. It has been found that the green parts in these three seal stones are dio-octahedral 2M1 muscovites and they belong to mica-seal stone. As to minor mineral compositions, they are dolomite, pyrite and apatite in SPL; it is kaolinite in YWL, and it is dolomite in XAL, which can provide some information for their respective places of origin. Micro-morphology characterization of the three kinds of muscovites indicate crystallization of muscovite in XAL is better than that in YWL, and the crystal shape of muscovite in SPL is not good because it has undergone hydrothermal alteration. On the other hand, chemical analyses of impurity ions in octahedral sheet have been studied in order to discuss color causing factors of green muscovite which suggests that green color in YWL and XAL are caused by Fe3+ and Ti4+ while green color in SPL is caused by Cr3+ in company with Fe3+ and Ti4+. |
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