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A relationship between interference color and retardation can be graphically illustrated in the classical Michel-Levy interference color chart, presented above. This graph plots retardation on the abscissa and specimen thickness on the ordinate.
Michel-Lévy interference colour chart issued by Zeiss Microscopy. 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.
Since the Michel-Lévy chart shows the interrelationships between thickness, birefringence, and interference color, the microscopist can determine any one of these from the chart if they know the other two. Several examples will illustrate this: Suppose a cylindrical synthetic iber 15 μm in diameter shows a maximum interference color
Two revisions of the original Michel-Lévy interference colour chart are presented, and discussed here. Compared to older charts these give a more precise match to the actual observations in the modern optical microscope.
In the text (p. 283), it is referred to as “Die Michel-Lévysche Farbentafel” (The Michel-Lévy Color Table), but the actual color chart (Figure 6) is titled “Doppelbrechung und Jnterferenzfarbe” (Double Refraction and Interference Color). This chart is 15″ X 9¼”; the colored area is 10″ X 4″.
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-
Title: The Michel-Lévy Interference Colour Chart Subject: GEOMATERIALS UNDER THE MICROSCOPE \(2013\) 4 Created Date: 1/7/2013 7:39:24 AM
