| dbo:abstract |
In optical mineralogy an interference colour chart, first developed by Auguste Michel-Lévy, is a tool to identify minerals in thin section using a petrographic microscope. With a known thickness of the thin section, minerals have specific and predictable colours in cross-polarized light, and this chart can help identify minerals. The colours are produced by the difference in speed in the fast and slow rays, also known as birefringence. When using the chart, it is important to remember these tips: * Isotropic and opaque (metallic) minerals cannot be identified this way. * The stage of the microscope should be rotated until maximum colour is found, and therefore, the maximum birefringence. * Each mineral, depending on the orientation, may not exhibit the maximum birefringence. It is important to sample a number of similar minerals in order to get the best value of birefringence. * Uniaxial minerals can look isotropic (always extinct) if the mineral is cut perpendicular to the optic axis (this situation can be revealed with the conoscopic interference pattern). (en) 干涉彩色图表(英語：interference colour chart）最早由 Auguste Michel-Lévy 開發，是一種使用岩石顯微鏡鑒定的工具。 由於薄片的厚度已知，礦物在交叉偏光下顯出具有一定且可預測的顏色，根據圖表顏色可以幫助識別礦物。顏色是由雙折射產生的。 使用干涉彩色图表須注意下列事項： 不適用各向同性（isotropic）礦物和。 顯微鏡的載物台應該旋轉直到找到最大雙折射顏色。 因爲礦物被切的方向不同，薄片上的礦物可能不會表現出最大的雙折射。 因此在薄片上，要進行多採樣，以得最大的雙折射值。 若垂直於晶體光軸切割礦物，單軸礦物看起來是各向同性的，這種情況可以通過錐光干涉圖來判別。。 (zh) |
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wiki-commons:Special:FilePath/Michel-Lévy_interfere...our_chart_(21257606712).jpg?width=300 |
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http://micro.magnet.fsu.edu/primer/java/polarizedlight/michellevylarge/index.html http://webmineral.com/images/InterferenceChart.jpg |
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dbr:Tool |
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dbo:Software |
| rdfs:comment |
干涉彩色图表(英語：interference colour chart）最早由 Auguste Michel-Lévy 開發，是一種使用岩石顯微鏡鑒定的工具。 由於薄片的厚度已知，礦物在交叉偏光下顯出具有一定且可預測的顏色，根據圖表顏色可以幫助識別礦物。顏色是由雙折射產生的。 使用干涉彩色图表須注意下列事項： 不適用各向同性（isotropic）礦物和。 顯微鏡的載物台應該旋轉直到找到最大雙折射顏色。 因爲礦物被切的方向不同，薄片上的礦物可能不會表現出最大的雙折射。 因此在薄片上，要進行多採樣，以得最大的雙折射值。 若垂直於晶體光軸切割礦物，單軸礦物看起來是各向同性的，這種情況可以通過錐光干涉圖來判別。。 (zh) In optical mineralogy an interference colour chart, first developed by Auguste Michel-Lévy, is a tool to identify minerals in thin section using a petrographic microscope. With a known thickness of the thin section, minerals have specific and predictable colours in cross-polarized light, and this chart can help identify minerals. The colours are produced by the difference in speed in the fast and slow rays, also known as birefringence. When using the chart, it is important to remember these tips: (en) |
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Interference colour chart (en) 干涉彩色图表 (zh) |
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