不同颜色青海软玉微观形貌和矿物组成特征

于海燕; 阮青锋; 孙媛; 李东升

doi:10.15898/j.cnki.11-2131/td.201704250066

不同颜色青海软玉微观形貌和矿物组成特征

1.
桂林理工大学地球科学学院, 广西桂林 541004

2.
广西隐伏金属矿产勘查重点实验室, 广西桂林 541004

基金项目:
广西自然科学基金项目（2015GXNSFBA139197）；桂林理工大学博士科研启动经费（002401003554）

详细信息

作者简介: 于海燕, 博士, 讲师, 研究方向为宝石矿物学。E-mail:yhy0410@glut.edu.cn

中图分类号: P575.1;P575.2

收稿日期: 2017-04-25

修回日期: 2018-06-09

录用日期: 2018-08-10

Micro-morphology and Mineral Composition of Different Color Qinghai Nephrites

1.
College of Earth Sciences, Guilin University of Technology, Guilin 541004, China

2.
Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin 541004, China

Received Date: 25 April 2017

Revised Date: 09 June 2018

Accepted Date: 10 August 2018

摘要

摘要: 青海软玉颜色丰富，近年来对青海软玉矿物学的研究不少，但针对不同颜色青海软玉矿物学特征的研究还存在欠缺。本文利用偏光显微镜、扫描电子显微镜、电子探针及粉晶X射线衍射仪器，从透闪石微形貌特征、微观结构、矿物组成及结晶度四个方面，研究了青海软玉颜色与矿物学特征的对应关系。结果表明：白玉、烟青玉、糖玉中透闪石主要为纤维状，显微纤维变晶结构，结晶度为96.12%~96.88%；青白玉和翠青玉中透闪石主要为叶片状，显微叶片变晶结构，结晶度为97.35%，97.32%；青玉和碧玉中透闪石主要为叶片状，显微叶片-隐晶质变晶结构，结晶度为95.48%，95.29%；黄玉中透闪石主要为柱状，显微柱状变晶结构，结晶度为97.84%。青海软玉主要组成矿物均为透闪石，含量在95%以上，部分次要矿物如翠青玉中的榍石、黄玉中的钙长石、青玉中的菱镁矿、碧玉中的铬铁矿、糖玉中的斜黝帘石只出现在特定颜色的青海软玉样品中。研究认为不同颜色青海软玉矿物学特征确实存在差异，这些特征为研究不同颜色青海软玉成矿环境及成矿条件提供了科学依据。
- 软玉 /
- 颜色 /
- 透闪石 /
- 变晶结构 /
- 结晶度
Abstract: BACKGROUNDQinghai nephrites show different colors. In recent years, there have been a lot of studies on Qinghai nephrite mineralogy, but the studies on the mineral characteristics of Qinghai nephrite with different colors are lacking. OBJECTIVESTo study the relationship between color and mineralogical features of Qinghai nephrites. METHODSPolarizing Microscopy, Scanning Electron Microscopy, Electron Probe Microanalyzer and Powder X-ray Diffraction were used to analyze the microtopography, microstructure, mineral composition and crystallinity of tremolite. RESULTSTremolite in white, blue-violet and brown Qinghai nephrite are mainly fibrous and have micro-fiber blastic texture with crystallinity of 96.12%-96.88%. Tremolite in green-white and viridis Qinghai nephrite are mainly foliated, and has micro-foliated blastic texture with crystallinity of 97.35% and 97.32%, respectively. Tremolite in green and azure-green Qinghai nephrite are mainly foliated, and have microscopic blade-cryptocrystalline blastic texture with crystallinity of 95.48% and 95.29%, respectively. Tremolite in yellow Qinghai nephrite is mainly columnar, and has micro-columnar blastic texture and crystallinity of 97.84%. The main mineral different color Qinghai nephrite is tremolite, with content of more than 95%. Some minor minerals only appear in the specific color Qinghai nephrite, such as titanite in viridis Qinghai nephrite, anorthite in yellow Qinghai nephrite, magnesite in green Qinghai nephrite, chromite in azure-green Qinghai nephrite, and clinozoisite in brown Qinghai nephrite. CONCLUSIONSThere are differences in mineral features of Qinghai nephrite in different colors, which provide a scientific basis for the study of ore-forming environments and conditions of Qinghai nephrites in different colors.
- nephrite /
- color /
- tremolite /
- blastic texture /
- crystallinity

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图 1 8种颜色青海软玉样品照片

Figure 1.

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图 2 不同颜色青海软玉微形貌特征

Figure 2.

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图 3 不同颜色青海软玉微观结构特征

Figure 3.

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图 4 不同颜色青海软玉电子探针背散射照片

Figure 4.

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图 5 不同颜色青海软玉XRD谱图

Figure 5.

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表 1 不同颜色青海软玉矿物电子探针数据

Table 1. Electron probe data of minerals in different colors Qinghai nephrite by EPMA

样品	矿物组成	SiO₂ (%)	MgO (%)	CaO (%)	Al₂O₃ (%)	FeO (%)	MnO (%)	TiO₂ (%)	K₂O (%)	Na₂O (%)	Cr₂O₃ (%)	含量 (%)	矿物
白玉	主要矿物	59.19	23.93	13.99	0.61	0.30	0.05	0.01	0.01	0.06	0.00	98.15	透闪石
	次要矿物	0.02	0.17	55.93	0.00	0.03	0.12	0.04	0.00	0.01	0.01	56.33	方解石
	次要矿物	0.07	0.08	0.00	0.02	92.08	0.02	0.04	0.00	0.03	0.05	92.39	磁铁矿
烟青玉	主要矿物	58.22	23.74	13.67	0.89	0.41	0.09	0.01	0.04	0.02	0.02	97.11	透闪石
烟青玉	次要矿物	0.00	0.09	55.54	0.01	0.00	0.03	0.03	0.01	0.02	0.00	55.73	方解石
糖玉	主要矿物	59.40	23.90	13.85	0.08	0.15	0.01	0.02	0.02	0.04	0.00	97.47	透闪石
	次要矿物	0.00	0.08	55.20	0.00	0.04	0.08	0.02	0.00	0.01	0.00	55.43	方解石
		38.53	0.45	23.68	28.26	5.75	0.01	0.08	0.01	0.06	0.00	96.82	斜黝帘石-1
		39.20	0.47	24.74	32.50	0.28	0.01	0.00	0.02	0.00	0.00	97.21	斜黝帘石-2
青白玉	主要矿物	59.54	24.37	13.50	0.13	0.09	0.00	0.01	0.03	0.06	0.02	97.75	透闪石
青白玉	次要矿物	54.34	17.54	24.17	2.53	0.43	0.03	0.09	0.00	0.32	0.00	99.46	透辉石
黄玉	主要矿物	58.17	23.92	14.05	1.78	0.40	0.03	0.00	0.07	0.17	0.00	98.59	透闪石
		54.94	16.26	24.56	2.74	0.69	0.03	0.00	0.03	0.50	0.02	99.77	透辉石
	次要矿物	40.08	0.06	24.04	34.33	0.73	0.00	0.07	0.00	0.00	0.00	99.31	钙长石-1
		43.79	0.03	19.58	35.42	0.28	0.01	0.00	0.02	0.03	0.01	99.17	钙长石-2
翠青玉	主要矿物	58.64	23.79	13.80	0.26	0.73	0.02	0.02	0.03	0.05	0.02	97.36	透闪石
		54.67	15.19	25.63	0.96	2.91	0.08	0.27	0.00	0.14	0.01	99.85	透辉石-1
	次要矿物	54.09	17.94	25.27	0.01	1.93	0.05	0.01	0.00	0.07	0.32	99.68	透辉石-2
		30.75	0.08	27.32	2.36	1.31	0.04	37.24	0.01	0.01	0.03	99.15	榍石
青玉	主要矿物	55.91	20.45	13.30	0.96	5.45	0.05	0.04	0.04	0.04	0.03	96..27	透闪石
		0.05	39.96	0.09	0.04	5.80	0.44	0.02	0.01	0.02	0.00	46.43	菱镁矿
	次要矿物	0.46	0.35	0.00	0.00	92.43	0.03	0.00	0.00	0.04	0.32	93.63	磁铁矿
		45.17	36.71	0.09	0.14	6.88	0.02	0.00	0.00	0.03	0.03	89.07	蛇纹石
碧玉	主要矿物	55.37	21.72	13.49	1.33	3.22	0.03	0.01	0.03	0.03	0.09	95..32	透闪石
		42.35	35.08	0.05	4.56	5.38	0.01	0.07	0.00	0.02	0.03	87.55	蛇纹石
		53.88	13.90	20.98	3.60	4.64	0.12	0.01	0.00	0.44	0.11	97.68	透辉石
	次要矿物	33.44	23.14	0.56	19.89	8.76	0.45	0.10	0.14	0.28	0.01	86.77	绿泥石
		0.05	1.00	0.00	3.12	33.85	0.83	0.06	0.00	0.04	59.83	98.78	铬铁矿

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表 2 不同颜色青海软玉晶面间距、晶胞参数和结晶度

Table 2. Interplanar distance, unite cell parameters and crystallinity of Qinghai nephrites with different colors by XRD

样品	d(110)	d(131)	d(240)	d(310)	d(151)	d(351)	a₀	b₀	c₀	β	C(%)
白玉	8.423	3.381	3.276	3.125	2.707	2.017	9.879	18.049	5.289	104.97	96.65
糖玉	8.435	3.383	3.278	3.127	2.707	2.017	9.902	18.068	5.387	104.86	96.12
烟青玉	8.436	3.386	3.278	3.127	2.709	2.017	9.808	18.047	5.337	103.83	96.88
青白玉	8.435	3.383	3.276	3.127	2.706	2.017	9.861	18.057	5.287	104.69	97.35
翠青玉	8.451	3.386	3.281	3.130	2.709	2.018	9.809	18.072	5.466	104.51	97.32
黄玉	8.434	3.388	3.276	3.125	2.707	2.017	9.917	18.064	5.366	104.98	97.84
碧玉	8.450	3.386	3.281	3.129	2.709	2.108	9.499	18.506	5.569	104.43	95.29
青玉	8.449	3.388	3.281	3.129	2.709	2.019	9.654	18.495	5.428	104.76	95.48
数据平均值	8.436	3.471	3.277	3.128	2.772	2.028	9.814	18.096	5.397	104.60	96.81
透闪石	8.377	3.373	3.268	3.119	2.700	2.013	9.818	18.047	5.275	104.79	-

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