海水及淡水养殖珍珠的物质组成

李立平

海水及淡水养殖珍珠的物质组成

李立平

中国地质大学珠宝学院, 湖北武汉 430074

基金项目:

湖北省科技攻关项目“珍珠改色新技术研究” 2003AA101C99

详细信息

作者简介:
李立平(1964-), 女, 博士, 教授, 主要从事宝石学教学与研究. E-mail: liliping12@gmail.com

中图分类号: S968.3
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出版历程
- 收稿日期: 2009-03-18
- 刊出日期: 2009-09-25

Composition of Seawater and Fresh Water Cultured Pearls

LI Li-ping

Gemmological Institute, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 采用偏光显微镜、X射线粉晶衍射仪、傅利叶红外光谱仪、电子顺磁共振谱仪、拉曼光谱仪、原子吸收光谱仪等测定了淡水珍珠、海水珍珠及部分贝壳的矿物及化学组成.研究表明: 珍珠矿物组成单一, 主要由文石构成, 仅含少量球文石或方解石; 淡水珍珠明显富含Mn, 而海水珍珠中明显富含Na、K、Mg、Sr; 这种富集特征与淡水、海水中元素的富集特征相似.此外, 各颜色品种之间化学成分也存在微小的差异, 白色珍珠比有色珍珠更纯净, 所含铁、锰、铬等致色元素更低.紫色珍珠略富含Mg、Mn, 橙色者明显富含Fe, 而黑色海水珍珠的颜色可能与有机组分有关.
- 养殖珍珠 /
- 矿物组成 /
- 化学组成 /
- 宝石
Abstract: Petrographic microscope, XRD, infra-red spectrometer, electron spin resonance (ESR), Raman spectrometer, atomic absorption spectrometer were used to analyze the mineralogical and chemical composition of seawater and fresh water cultured pearls in this paper.The results show that pearls mainly consist of aragonite, with very few varterite and calcite.Fresh water cultured pearls are rich in Mn, but sea water cultured pearls rich in Na, K, Mg, and Sr.The enrichement character of freshwater pearl and seawater pearl is very similar to that of fresh water and seawater.There are detectable differences in chemical composition among different colored varieties.Violet pearls are slightly rich in Mg and Mn, orange pearls distinctively rich in Fe, and black seawater pearls probably have high organic contents.By contrast, white pearls contain little coloring elements such as Fe, Mg, and Cr.
- cultured pearls /
- mineral composition /
- chemical composition /
- jewels

HTML全文

图 1 珍珠内部结构

a.海水养殖核珍珠横断面: 珍珠层与核之间有棱柱状方解石层, 宝石显微镜下40X;b.海水养殖有核珍珠薄片: 偏光显微镜, d=0.2 mm, 1方解石棱柱层, 2珍珠层, 3珠核; c.淡水养殖有核珍珠薄片: 珍珠层与核之间为褐色的介壳层, 偏光显微镜下, d=1.5 mm; d.蠕虫状球文石SEM照片, 10 000X;e.海水珍珠珍珠层SEM照片3 900X;f.淡水养殖无核珍珠薄片: 内部为放射状文石柱晶, 偏光显微镜下, d=1.5 mm

Fig. 1. Photos of internal structure of pearls

下载: 全尺寸图片幻灯片

图 2 淡水无核珍珠的中心部分的XRD图谱

▲为文石的特征吸收峰(aragonite's peark); ○为球文石的特征吸收峰(varterite's peak); 中国地质大学测试中心, 雷新荣测

Fig. 2. XRD of center part in fresh water cultured pearl

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图 3 各色淡水珍珠Fe、Mn、Cu含量对比

Fig. 3. Comparison of content of Fe, Mn, Cu in colored pearl varieties

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图 4 各色淡水珍珠的拉曼光谱(中国地质大学资源学院何谋春测)

Fig. 4. Raman spectra of colored varieties of freshwater cultured pearls

下载: 全尺寸图片幻灯片

图 5 各色淡水珍珠的电子顺磁共振谱(青岛海洋地质研究所测)

Fig. 5. ESR spectra of colored varieties of freshwater cultured pearls

下载: 全尺寸图片幻灯片

图 6 塔希提黑色海水养殖珍珠的ESR谱(青岛海洋地质研究所测)

Fig. 6. ESR spectrum of black seawater cultured pearl

下载: 全尺寸图片幻灯片

图 7 塔希提黑珍珠与我国带灰黑色斑点海水珍珠的拉曼光谱(中国地质大学资源学院何谋春测)

Fig. 7. Raman spectra of Tahiti pearls and black patch in Hepu seawater cultured pearls

下载: 全尺寸图片幻灯片

表 1 养殖珍珠和贝壳的XRD衍射峰d值

Table 1. XRD of cultured pearls and shells

表 2 珍珠中文石的晶胞参数计算结果

Table 2. Crystal cell parameter of aragonite in pearls

表 3 珍珠的红外光谱测试结果

Table 3. Analyses result of Infra-red spectrometer of pearls

表 4 淡水养殖珍珠与海水养殖珍珠化学成分分析结果(%)

Table 4. Chemical composition of freshwater cultured pearl and seawater cultured pearls

表 5 海水、淡水成分与海水珍珠、淡水珍珠成分对比

Table 5. Comparison in composition among seawater, freshwater, and cultured pearls

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