Mineralogical Characteristics of Ureyite in Jadeite Jade
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摘要: 采用电子探针、X射线衍射和吸收光谱分析研究翡翠中钠铬辉石的矿物学特征。结果显示,钠铬辉石与翡翠呈共生关系;其分子式为(Na0.83Ca0.02)(Cr0.78Al0.10Fe0.08Mg0.02) Si2.06O6;晶胞参数 a=9.530 Å,b=8.672 Å,c=5.264 Å,β=107.51°,V=414.88;密度为3.55g/cm3;钠铬辉石中Cr3+的晶体场跃迁决定了其具有深浅程度不同的绿色调。Abstract: In the paper, mineralogical characteristics and compositions of ureyite in jadeite jade are studied by using EPMA, X-ray diffraction and absorption spectroscopy analysis.The results show that ureyite is paragenous with jadeite jade, and the chemical formula of ureyite is(Na0.83Ca0.02)(Cr0.78Al0.10Fe0.08Mg0.02) Si2.06O6.The unit cell parameters of ureyite are a=9.530 Å, b=8.672 Å, c=5.264 Å, β=107.51°, V=414.88 and the density is 3.55g/cm3.Different shades of green in ureyite are related to the crystal-field transition frequency of Cr3+.
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Keywords:
- ureyite /
- jadeite jade /
- mineralogical characteristic /
- composition analysis
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[1] Qui Mei Ou Yang.A terrestrial source of ureyite[J].The American Mineralogist 1984,69(1):180-183.
[2] V M Khomenko A N Platomav.Electonic absorption spectra of Cr3+ zones in natural clinopyroxens[J].Physchem Minerals 1985,11(6):261-265.
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