缅甸抹谷粉色石榴石的宝石学和谱学特征

张龙博; 林碧菡; 万水芸; 陈涛; 张倩

doi:10.15964/j.cnki.027jgg.2023.03.003

缅甸抹谷粉色石榴石的宝石学和谱学特征

张龙博^{1, 2, 3,},
林碧菡^{1, 2},
万水芸^{1, 2},
陈涛^{1, 2},
张倩^{1, 2, ,}

1.
中国地质大学(武汉)珠宝学院，湖北武汉 430074
2.
湖北省珠宝工程技术技术研究中心，湖北武汉 430074
3.
河南省产品质量检验技术研究院国家玉石金银饰品质量检验检测中心(河南)，河南郑州 450047

基金项目:

国家自然科学基金面上基金项目 42072252

中国地质大学(武汉)珠宝检测技术创新中心文章编号 CIGTWZ-2022007

详细信息

作者简介:
张龙博(1995-)，男，助理工程师，主要从事珠宝检测及宝石学方向研究工作。E-mail：zhanglongbo@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向的研究工作。E-mail：qianzhang@cug.edu.cn

中图分类号: P575;TS93
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出版历程
- 收稿日期: 2022-10-31
- 刊出日期: 2023-05-30

Gemmological and Spectral Characteristics of Pink Garnet from Mogok, Myanmar

ZHANG Longbo^{1, 2, 3,},
LIN Bihan^{1, 2},
WAN Shuiyun^{1, 2},
CHEN Tao^{1, 2},
ZHANG Qian^{1, 2, ,}

1.
Gemmological Institute, China University of Geosciences, Wuhan 430074, China
2.
Hubei Gems and Jewelry Engineering Technology Research Center, Wuhan 430074, China
3.
National Center for Quality Inspection and Testing of Gem & Gold-Silver Jewelry, Henan Institute of Product Quality Inspection Technology, Zhengzhou 450047, China

摘要

摘要: 采用折射仪等常规宝石学仪器、电子探针(EPMA)、激光剥蚀电感耦合等离子体质谱仪(LA-ICP-MS)、激光拉曼光谱仪、傅里叶变换红外光谱仪和紫外-可见光谱仪对2颗产自缅甸抹谷的粉色石榴石样品进行测试。红外光谱及拉曼光谱表明其属于较纯净的钙铝榴石端元。电子探针测试得到其化学成分均接近钙铝榴石端元，平均晶体化学式分别为Ca_3.08(Al_1.84Ti_0.06Fe_0.01Mg_0.01)_1.92[(Si_2.90Al_0.10)_3.00O₁₂] 和Ca_3.06(Al_1.84Ti_0.08Fe_0.01Mg_0.01)_1.94[(Si_2.91Al_0.09)_3.00O₁₂]。LA-ICP-MS测试结果表明，2颗粉色石榴石样品均含有Ti、Fe、Zr、Mn、Nb、Ga、Sn等微量元素，相比于颜色相近的墨西哥草莓红钙铝榴石前者Ti含量较高，在5 444~10 035 ppm，而Mn含量较低，仅有47~132 ppm。紫外-可见吸收光谱结果显示，2颗粉色石榴石样品分别在489 nm和495 nm处有吸收带，均有以550 nm为中心的吸收宽带，结合微量元素测试结果及其他学者对石榴石及其他硅酸盐矿物中Mn离子吸收光谱的研究分析，推测样品的粉红色由Mn³⁺导致。
- 粉色钙铝榴石 /
- 宝石学特征 /
- 谱学特征 /
- 颜色成因 /
- 缅甸抹谷
Abstract: In this paper, 2 pink garnet samples from Mogok, Myanmar were studied by electron microprobe, laser ablation inductively coupled plasma mass spectrometer(LA-ICP-MS), Raman spectrometer, infrared spectrometer and ultraviolet-visible spectrometer and other conventional gemmological tests. Infrared and Raman spectra results indicated that they are close to the grossular endmember. The chemical composition of the samples was tested by electron microprobe. The result also demonstrated that the 2 samples are close to the endmember of grossular. The average chemical structure formulas of the samples G1 and G2 are Ca_3.08(Al_1.84Ti_0.06Fe_0.01Mg_0.01)_1.92[(Si_2.90Al_0.10)_3.00O₁₂]and Ca_3.06(Al_1.84Ti_0.08Fe_0.01Mg_0.01)_1.94[(Si_2.91Al_0.09)_3.00O₁₂], respectively. The test result of LA-ICP-MS showed that both samples contain trace elements such as Ti, Fe, Zr, Mn, Nb, Ga and Sn. The content of Ti in the samples, ranging from 5 444 to 10 035 ppm, is higher than that in raspberry-red grossular from Mexico, while the content of Mn is lower, only 47 to 132 ppm. Ultraviolet-visible spectra analysis revealed that the samples G1 and G2 have absorption bands at 489 nm and 495 nm, respectively. There is an absorption broad band centered at 550 nm in both samples. Combined with the trace elements in the samples and the previous research about the role of Mn in garnet and other silicates, it is believed that the absorption broad bands are related to Mn³⁺, which means their colour is probably due to the presence of small amounts of Mn³⁺.
- pink grossular /
- gemmological characteristic /
- spectral characteristic /
- colour genesis /
- Mogok, Myanmar

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致谢: 感谢稀有宝石爱好者熊小康提供样品。

图 1 缅甸抹谷粉色石榴石样品

Figure 1. Pink garnet samples from Mogok, Myanmar

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图 2 粉色石榴石样品的拉曼光谱

Figure 2. Raman spectra of pink garnet samples

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图 3 粉色石榴石样品的红外光谱

Figure 3. Infrared spectra of pink garnet samples

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图 4 粉色石榴石样品的紫外-可见吸收光谱

Figure 4. UV-Vis spectra of pink garnet samples

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表 1 缅甸抹谷粉色石榴石样品的化学成分

Table 1 Chemical compositions of pink garnet samples from Mogok, Myanmar w_B/%

氧化物	G1-1	G1-2	G1-3	G1-4	G1-5	G2-1	G2-2	G2-3	G2-4	G2-5
CaO	38.355	37.810	38.136	38.107	38.012	38.151	38.448	38.588	38.163	38.296
FeO_T	0.155	0.024	0.137	0.033	0.056	0.056	0.183	0.127	0.059	0.115
Na₂O	0.018	0.017	0.032	0.025	-	0.030	0.024	0.056	-	0.011
MgO	0.072	0.053	0.081	0.047	0.036	0.052	0.060	0.055	0.046	0.051
Al₂O₃	21.746	21.680	22.125	21.904	21.306	21.925	22.034	21.753	22.021	22.108
SiO₂	38.865	38.217	38.506	38.206	37.909	39.050	39.146	38.891	38.937	38.975
TiO₂	1.053	1.152	1.112	1.134	1.183	1.385	1.525	1.486	1.524	1.565
MnO	0.006	0.038	0.009	0.002	0.009	-	0.028	-	0.036	0.006
Total	100.270	98.991	100.140	99.458	98.511	100.650	101.450	100.960	100.790	101.130
注：—表示低于检测限

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表 2 缅甸抹谷粉色石榴石样品的微量元素

Table 2 Trace elements of pink garnet samples from Mogok, Myanmar /ppm

样品号	Ti	Mn	Fe	Ga	Zr	Nb	Sn
G1-1	5 661	49	948	123	925	368	112
G1-2	5 444	47	917	130	881	275	105
G1-3	7 454	98	835	116	849	853	82
G1-4	6 896	89	790	116	769	823	74
G1-5	6 952	89	806	117	756	689	81
G1-6	6 181	84	764	121	809	701	69
G2-1	8 004	105	939	112	630	1 030	75
G2-2	7 388	132	1215	104	768	1 545	80
G2-3	10 035	57	784	91	751	2 290	122
G2-4	6 425	53	939	116	910	464	125
G2-5	9 150	51	823	91	735	690	131
G2-6	9 122	56	832	94	816	714	132
注：仅列出每个测试点中都存在且大于10 ppm的元素

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