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In optical mineralogy, an interference colour chart, also known as the Michel-Levy chart, is a tool first developed by Auguste Michel-Lévy to identify minerals in thin section using a petrographic microscope.
The birefringence of a anisotropic material can be estimated when observed and/or photographed in a polarized light microscope. A relationship between interference color and retardation can be graphically illustrated in the classical Michel-Levy interference color chart, presented above.
Descubre la Tabla de Michel-Levy, una herramienta para identificar los minerales por sus colores de interferencia en el microscopio óptico.
Auguste Michel-Lévy (1844–1911) French geologist, Inspector General of Mining and director of the Geological Survey in France, made a name for himself by his research into extrusive rocks, their microscopic structure and origin. Until this day, the interference color chart proposed by him in 1888 remains an important tool in the identi-
COLORES DE INTERFERENCIA Y TABLA DE MICHEL-LÉVY. Para cada una de las componentes de la luz blanca, podemos representar las posiciones de los máximos y mínimos de transmisión, frente al retardo, que dependerán de las respectivas longitudes de onda (ver figura).
The MICHEL-LÉVY interference color chart is a color key to unlock many myster-ies associated with particle analysis. The chart (Hooke College students receive a laminated version) is a valuable aid to the light microscopist in that it graphi-cally relates the thickness, retardation (optical path difference), and birefringence
Colores de Interferencia, Birrefringencia y Retraso. El color de un mineral bajo luz de polarización cruzada se llama su color de interferencia. Los colores de interferencia categorizados por colores de primer, segundo, tercero y cuarto orden se muestran en la Figura 2.7.3.
