桂林鸡血玉的致色机理研究

发布时间：2018-01-10 03:17

  本文关键词：桂林鸡血玉的致色机理研究　出处：《矿物岩石》2016年04期 　论文类型：期刊论文

  更多相关文章： 桂林鸡血玉 石英质玉石 赤铁矿 色心致色 龙胜

【摘要】：借助偏光显微镜和X射线粉晶衍射仪、电子探针、紫外-可见-近红外分光光度计等现代仪器设备,对桂林鸡血玉的显微结构、矿物组成及致色机理进行分析和探讨。桂林鸡血玉的颜色多样,包括红色、"红血黑地"、黄色、紫色和绿色5大系列。玉石主要为他形等粒变晶结构,部分区域可见变斑晶结构,主要矿物为微晶质—隐晶质石英,次要矿物主要为赤铁矿,部分玉石中还有少量的绿泥石、滑石甚至白云石等,w(SiO2_)介于94.92%到99.65%之间。不同形态的赤铁矿及其他矿物杂质是引起玉石颜色多样性的主要原因,[FeO_4]~(4-)空穴色心对可见光的选择性吸收使玉石呈现紫色。鸡血玉的红色与细尘状赤铁矿密切相关,细尘状赤铁矿越密集玉石的颜色越深,细尘状赤铁矿含水时鸡血玉的红色较为鲜艳;不同色调的黑色鸡血玉主要由鳞片状赤铁矿或集合体磁铁矿致色;黄色主要由氧化铁的含水矿物——针铁矿所引起,且随着鳞片状赤铁矿含量的增加,颜色逐渐偏向于橙黄色;不同色调的鳞片状绿泥石是玉石呈绿色的根本原因,滑石和白云石对玉石的颜色没有直接的影响,但它们的存在使玉石的光泽变暗、透明度降低。
[Abstract]:The microstructure of Guilin chicken blood jade was studied by means of polarizing microscope, X-ray powder diffractometer, electron probe, UV-Vis near infrared spectrophotometer and other modern instruments. The mineral composition and chromogenic mechanism were analyzed and discussed. The color of Guilin chicken blood jade was various, including red, red, red blood black, yellow, purple and green. The main minerals are microcrystalline-cryptic quartz, secondary minerals are hematite, and some jade have a small amount of chlorite, talc and even dolomite. Different forms of hematite and other mineral impurities are the main reasons for the color diversity of jade. [FeO_4) the selective absorption of visible light by the color center of the hole makes the jade appear purple. The red of the chicken blood jade is closely related to the fine dust hematite, the more dense the fine dust hematite is, the darker the color of the jade is. The red of chicken blood jade is bright when fine dust hematite contains water; Black chicken blood jade of different tone is mainly caused by scale hematite or aggregate magnetite. Yellow is mainly caused by hydrous iron oxide mineral-goethite, and with the increase of scale hematite content, the color tends to orange. Different tone scale chlorite is the basic reason of jade green, talc and dolomite have no direct influence on the color of jade, but their existence makes the gloss of jade dim and the transparency decrease.
【作者单位】： 桂林理工大学地球科学学院;扬州市玉器产品质量监督检验中心;
【基金】：国家自然科学基金项目(41362004)
【分类号】：P619.28
【正文快照】： p苝，

本文编号：1403635