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Science 18 January 1974:
Vol. 183. no. 4121, pp. 206 - 208
DOI: 10.1126/science.183.4121.206
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Articles

Ordered Lattice Defects in Colored Fluorite: Direct Observations

L. E. Murr 1

1 Department of Metallurgical and Materials Enigineering, New Mexico Institute of Mining and Technology, Socorro 87801

Ordered arrays of defect aggregates in the (111) planes of natural fluorite have been observed by transmission electron microscopy. The intense blue coloration observed in corresponding sample areas after 200-kilovolt electron microscopy confirms the conclusion that these are color-center aggregates and, conversely, that color centers are primarily responsible for fluorite coloration.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)