Electron Microscope Studies of the Structure of Opal
作者:
Stephen H. Cole,
E. A. Monroe,
期刊:
Journal of Applied Physics
(AIP Available online 1967)
卷期:
Volume 38,
issue 4
页码: 1872-1873
ISSN:0021-8979
年代: 1967
DOI:10.1063/1.1709775
出版商: AIP
数据来源: AIP
摘要:
Replication electron microscopy has confirmed that the microstructure of precious opal consists of spherical particles of amorphous silica, SiO2, packed in a cubic close‐packed array. Twinning relationships have been observed obeying the spinel twin law. Regions related by twinning correspond to the bands or striations observed under the light microscope. A specimen of common opal displayed a unique topography upon etching.
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