马达加斯加含定向包裹体磷灰石的宝石矿物学特征

李星彤; 徐畅; 郑金宇; 沈洪涛; 沈锡田; 张倩

马达加斯加含定向包裹体磷灰石的宝石矿物学特征

1.
中国地质大学(武汉)珠宝学院，湖北武汉 430074
2.
中国地质大学(武汉)地球科学学院，湖北武汉 430074
3.
中国地质大学(武汉)地质过程与矿产资源国家重点实验室，湖北武汉 430074

详细信息

作者简介:
李星彤(2000-)，女，硕士研究生，主要从事宝石学方面的研究。E-mail：xingtong.li@cug.edu.cn

通讯作者:
张倩(1986-)，女，讲师，主要从事宝石学及矿物学方面的研究工作。E-mail：qianzhang@cug.edu.cn

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出版历程
- 收稿日期: 2024-07-14
- 刊出日期: 2024-10-30

Gemmological and Mineralogical Characteristics of Apatite from Madagascar with Directional Inclusions

1.
Gemmological Institute, China University of Geosciences, Wuhan 430074, China
2.
School of Earth Science, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要:
含定向包裹体的晶体经定向切磨后，可呈现包括星光效应与猫眼效应在内的特殊光学效应。因其美丽的外观，这种宝石在市场上受到消费者的喜爱。磷灰石内部常见丰富的定向包裹体，切磨后可以呈现猫眼效应。猫眼磷灰石很常见，在一些非洲与亚洲国家均有产出。但与刚玉、石榴石与金绿宝石等常见宝石相比，关于磷灰石内部定向包裹体的组分、成因的系统性研究较少。因此，本文通过显微镜、拉曼光谱仪、扫描电子显微镜、X射线能谱仪、磁性测试对一种产自马达加斯加的含定向排列包裹体的磷灰石样品进行了较为系统的测试分析。显微观察表明，磷灰石样品内部含有大量具金属光泽的针状包裹体，平行主晶c轴生长，切磨成弧面型宝石后可产生猫眼效应。EDS结果表明，包裹体出露区域富含Fe与O元素，指示包裹体为一种铁氧化物。拉曼光谱显示包裹体具有位于662 cm^-1处的弱拉曼峰，可归属为磁铁矿的A_1g振动峰。磁滞回线测试进一步表明包裹体为亚铁磁性物质，表明针状包裹体的成分为磁铁矿。磷灰石内部的定向磁铁矿包裹体并不常见，该研究结果对磷灰石内含物研究领域提供了新的见解。
- 磷灰石 /
- 猫眼效应 /
- 定向包裹体 /
- 磁滞回线 /
- 磁铁矿
Abstract:
In this study, the apatites containing directional arrangement inclusions from Madagascar were investigated using microscope, Raman spectroscopy, scanning electron microscope (SEM), X-ray energy dispersive spectroscopy (EDS), and magnetic test. Microscopic observation results show that there are abundant needle-like inclusions with metallic luster, which are parallel to c-axis of the apatite crystal. These inclusions could produce the cat's eye effect of apatite under the light. EDS results reveal that Fe and O elements are rich in the exposed region of inclusion, suggesting that it is a type of iron oxide. Raman spectroscopy displays a weak peak at 662 cm^-1, which can be attributed to the A_1g vibration mode of magnetite. The hysteresis loop test confirms that the inclusions are ferromagnetic substances, indicating that the needle-like inclusions are magnetite.
- apatite /
- cat eye's effect /
- directional arrangement inclusion /
- hysteresis loop /
- magnetite

HTML全文

图 1 紫绿玛瑙样品QZ-1 (a)和QZ-9 (b)

Figure 1. Purple-green agate samples QZ-1 (a) and QZ-9 (b)

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图 2 紫绿玛瑙的紫外-可见光谱一阶导图

Figure 2. First-order derivatives of the UV-Vis spectra obtained for purple-green agate samples

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图 1 产自马达加斯加的磷灰石样品: (a)原石样品；(b)弧面型样品在光照下产生猫眼效应

Figure 1. Apatite samples from Madagascar: (a) rough samples; (b) cabochon sample with cat eye's effect under parallel light

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图 2 磷灰石样品的显微特征: (a)平行磷灰石c轴的深色针状包裹体；(b)磷灰石内丰富的气液二相包裹体

Figure 2. Microscopic features of apatite samples: (a) dark needle-like inclusions parallel to the c-axis of apatite; (b) abundant gas-liquid two-phase inclusions inside the apatite

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图 3 包裹体出露区域的背散射电子相及元素分布图

Figure 3. BSE images and element distribution maps of the inclusion exposed region

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图 4 磷灰石基底与包裹体出露区域的拉曼光谱

Figure 4. Raman spectra of apatite base and inclusion exposed region

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图 5 磷灰石和包裹体混合物的磁滞回线

Figure 5. The hysteresis loop of the mixture of apatite and inclusions

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