Dictionary of Gems and Gemology

2009 Edition
| Editors: Mohsen Manutchehr-Danai

a

Reference work entry
DOI: https://doi.org/10.1007/978-3-540-72816-0_1

a symbol for one of the three crystallographic axes. With subscript0, as a0. The letter “a” usually appears in italics.

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© Springer-Verlag Berlin Heidelberg New York 2009