Difference between revisions of "Right-handed quartz"
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| + | <font color="blue">Quartz droit</font> (''Fr''). <font color="black">Quarzo destrogiro</font> (''It''). <font color="purple">右石英</font> (''Ja''). <font color="green">Cuarzo diestro</font> (''Sp''). | ||
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==Definition== | ==Definition== | ||
The dextrorotatory quartz is called [[right-handed quartz]]. The space group of the [[right-handed quartz]] in the low-temperature phase is ''P''3<sub>2</sub>21. | The dextrorotatory quartz is called [[right-handed quartz]]. The space group of the [[right-handed quartz]] in the low-temperature phase is ''P''3<sub>2</sub>21. | ||
==History== | ==History== | ||
| − | In 1811, D. F. J. Arago found the optical activity of the quartz plate prepared by cutting the crystal into slices perpendicular to the | + | In 1811, D. F. J. Arago found the optical activity of the quartz plate prepared by cutting the crystal into slices perpendicular to the ''c'' axis. In 1819, J.-B. Biot examined the quartz plates by a polarimeter to recognize that there are dextrorotatory and laevorotatory quartz. The absolute structure of the dextrorotatory quartz was determined by X-ray anomalous scattering in 1958 by A. De Vries to establish the relationship that the dextrorotatory quartz has 3<sub>2</sub> screw axes. |
==Reference== | ==Reference== | ||
Latest revision as of 13:01, 26 March 2019
Quartz droit (Fr). Quarzo destrogiro (It). 右石英 (Ja). Cuarzo diestro (Sp).
Contents
Definition
The dextrorotatory quartz is called right-handed quartz. The space group of the right-handed quartz in the low-temperature phase is P3221.
History
In 1811, D. F. J. Arago found the optical activity of the quartz plate prepared by cutting the crystal into slices perpendicular to the c axis. In 1819, J.-B. Biot examined the quartz plates by a polarimeter to recognize that there are dextrorotatory and laevorotatory quartz. The absolute structure of the dextrorotatory quartz was determined by X-ray anomalous scattering in 1958 by A. De Vries to establish the relationship that the dextrorotatory quartz has 32 screw axes.
Reference
- Glazer, A. M. (2018). J. Appl. Cryst. 51, 915–918. Confusion over the description of the quartz structure yet again