Gemmological Characteristic of Quartzose Jade by Metamorphism
-
摘要: 宝石学中经变质作用形成的石英质玉尚属首次报道。经偏反光显微镜及电子探针、X射线粉末衍射、红外光谱测试分析，对样品进行详细研究并总结其宝石学特征。测试结果表明，样品由重结晶石英和少量低钠长石组成，石英呈显微微晶粒状，最大粒径为0.01 mm。电子探针放大2 000倍，其二次电子像(SE)显示样品由1~2 μm的细小鳞片互层叠加而形成致密结构，样品从皮壳到过渡层到内部，结晶程度逐渐减弱，内部石英大部分呈隐晶状，看不到晶粒界线。电子探针数据显示, 石英中SiO2质量分数低于理论值，钛铁矿在蚀变过程中产生H2O导致其化学成分总质量分数不到100%。红外光谱显示, 900~1 200 cm-1及5 200 cm-1附近出现明显的分裂，证明此材料是一种经变质作用形成含水的石英质玉。Abstract: The metamorphic quartzose jade in gemmology is reported for the first time. In this paper, the gemmological characteristics of the samples were summarized by means of polarizing microscope and reflecting microscope, electron probe, X-ray powder diffraction and infrared spectroscopy.The test results showed that the sample is composed of recrystallized quartz and a small amount of low-sodium feldspar. The quartz was a microcrystalline grain with a maximum particle size of 0.01 mm. Electron probe magnification 2 000× second electron image (SE) shows that the sample has a dense structure formed by 1—2 μm micron fine scales superposed with each other. The degree of crystallization of the sample decreases gradually from the shell to the transition layer to the interior and most of the internal quartz was cryptocrystalline and the grain boundaries could not be seen. The mass fraction of SiO2 in the quartz electron probe data is lower than the theoretical value. The total chemical composition of ilmenite is less than 100% due to the production of H2O during alteration.The infrared spectra showed obvious splitting near 900—1 200 cm-1 and 5 200 cm-1, which fully proved that the material was a kind of quartz jade formed by metamorphism that contains water.
-
Keywords:
- quartzose jade /
- metamorphism /
- gemmological characteristic
-
致谢: 新疆岩矿宝玉石产品质量监督检验站况守英高级工程师给予了帮助和指正，在此表示感谢！
-
![]()
图 1 样品外观特征和显微特征
a.样品外观特征；b.实体显微镜下呈致密块状结构；c.偏光显微镜下由外向内结晶程度逐渐减弱；d.正交镜下呈棒状的碎屑；e.二次电子像下呈细小鳞片互层叠加状结构；f.背散射像下钠长石呈他形粒状嵌入石英
Figure 1. Appearance characteristics and microscopic features of the sample
![]()
图 3 样品与石英岩、玻璃的红外反射光谱
Figure 3. Infrared reflection spectra of the sample, quartzite and glass
![]()
图 4 样品与玛瑙、欧泊的红外透射光谱
Figure 4. Infrared transmission spectra of the sample, agate and opal
表 1 石英的电子探针成分分析结果
Table 1 Chemical compositions of quartz by electron probe analysis
wB/% 测点号 SiO2 K2O CaO Al2O3 MgO Na2O TiO2 FeOT MnO Total csq-001 92.20 5.28 0.16 0.92 0.24 0.18 0.06 0.81 0.00 99.86 csq-002 90.91 5.85 0.40 0.84 0.43 0.09 0.09 0.90 0.00 99.50 csq-003 91.72 5.92 0.21 1.62 0.37 0.10 0.00 0.97 0.00 100.90 csq-004 90.92 6.46 0.27 2.00 0.22 0.19 0.00 0.59 0.00 100.63 csq-005 91.49 5.92 0.26 0.86 0.34 0.12 0.00 0.85 0.04 99.89 
下载: 导出CSV
表 2 低钠长石的电子探针成分分析结果
Table 2 Chemical compositions of low-sodium feldspar by electron probe analysis
wB/% 测点号 SiO2 K2O CaO Al2O3 MgO Na2O TiO2 FeOT MnO Total csa-001 67.28 6.41 1.11 19.67 0.02 5.90 0.04 0.16 0.00 100.58 csa-002 66.32 5.95 1.18 19.87 0.00 6.09 0.01 0.17 0.00 99.59 csa-003 66.39 5.72 1.20 19.95 0.00 6.11 0.00 0.13 0.03 99.53
下载: 导出CSV
表 3 蚀变钛铁矿电子探针成分分析结果
Table 3 Chemical compositions of altered ilmenite by electron probe analysis
wB/% 测点号 FeOT Cr2O3 TiO2 Al2O3 MgO CoO MnO NiO ZnO Total cst-001 45.06 0.00 43.07 0.21 2.10 0.02 0.30 0.00 0.09 90.84 cst-002 43.52 0.19 44.60 0.30 2.67 0.11 0.39 0.00 0.00 91.77
下载: 导出CSV
表 4 样品的X射线粉末衍射数据和标准卡片对比
Table 4 Comparison of X-ray powder diffraction data of sample with standard cards
I/I。 d/Å(理论) d/Å(实测) h k l 1 000 3.343 9 3.343 1 101 169 4.255 7 4.260 4 100 120 1.818 1 1.820 6 112 54 2.457 0 2.459 4 110 48 2.281 6 2.284 0 012 38 2.127 8 2.130 5 200 10 2.236 8 2.238 9 111
下载: 导出CSV
-
[1] GB/T 34098-2017石英质玉分类与定名[S].北京: 中国标准出版社, 2017. [2] 周丹怡, 陈华, 陆太进, 等.广西桂林不同颜色石英质玉的宝石学特征对比研究[A].珠宝与科技: 中国国际珠宝首饰学术交流会论文集[C].北京: 中国地质大学出版社, 2017. [3] 李宝军.内蒙古"余太翠"的地质学和宝石学特征研究[A].中国珠宝首饰学术交流会论文集[C].北京: 地质出版社, 2011. [4] 杨林, Mashkovtsev R, Botis S, et al.绿色石英岩(贵翠)致色因素研究[A].中国珠宝首饰学术交流会论文集[C].北京: 地质出版社, 2009. [5] 王濮, 潘兆橹, 翁玲宝, 等.系统矿物学[M].北京:地质出版社, 1982. [6] 牟莉, 崔文元.昌化明.矾石地鸡血石的矿物学研究[J].岩石矿物学杂志, 2004, 23(1):69-74. http://www.cqvip.com/Main/Detail.aspx?id=9214945 [7] 张蓓莉.系统宝石学[M].2版.北京:地质出版社, 2006. [8] 李建军, 刘晓伟, 王岳, 等.不同结晶程度SiO2的红外光谱特征及其意义[J].红外, 2010, 12;31(12):31-35. http://www.cnki.com.cn/Article/CJFDTotal-HWAI201012011.htm [9] 陈华, 柯捷, 周丹怡, 等.从我国不同商品名称石英质玉石的宝石学特征探讨其定名[A].珠宝与科技: 中国国际珠宝首饰学术交流会论文集(2015)[C].北京: 国土资源部珠宝玉石首饰管理中心, 2015. [10] 李建军, 田亮光, 程佑法, 等.红外光谱仪在宝石鉴定中的常规化应用及须注意的问题—与KBr压片法比较[J].红外, 2008, 29(1):28-36. http://www.cqvip.com/main/detail.aspx?id=26316999 -
期刊类型引用(1)
1. 徐世龙，杨九昌，陈全莉. 危地马拉“永楚料”翡翠的宝石学特征. 宝石和宝石学杂志(中英文). 2024(02): 31-42 . 
百度学术
其他类型引用(0)
计量
- 文章访问数: 574
- HTML全文浏览量: 160
- PDF下载量: 55
- 被引次数: 1
