Higgins Michael D.. (2010). Imaging birefringent minerals without extinction using circularly polarized light. The Canadian Mineralogist, 48, p. 231-235.
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URL officielle: http://dx.doi.org/doi:10.3749/canmin.48.1.231
Résumé
Linear cross-polarized optical images reveal the birefringence of mineral grains and are very useful in petrography. However, if the vibration directions of the crystal are not at 45° to the polarizers, then the intensity of the interference colors is reduced, and in some orientations, to zero (extinction). This reduction in intensity, and extinction, can be eliminated if circular polarizers are used in place of linear polarizers. The interference colors of colorless minerals then correspond exactly with those on the Michel-Lévy chart. Similarly, isogyres are eliminated from conoscopic images. This simple, inexpensive technique can be used with ordinary petrographic microscopes and scanners. It can be very useful for quantification of textures (microstructures) from single images.
| Type de document: | Article publié dans une revue avec comité d'évaluation |
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| Volume: | 48 |
| Pages: | p. 231-235 |
| Version évaluée par les pairs: | Oui |
| Date: | 2010 |
| Sujets: | Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie) |
| Département, module, service et unité de recherche: | Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre |
| Mots-clés: | optical mineralogy, polarized light, circular polarization, textural quantification, birefringence |
| Déposé le: | 29 mars 2018 00:40 |
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| Dernière modification: | 29 mars 2018 00:42 |
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