Light interference figure pattern

Light interference figure pattern

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Caption: Light micrograph of the light interference figure pattern (conoscopic figure) for the mineral quartz: characteristic interference figures are used by geologists & crystallographers to identify minerals. The feature in the centre (a so-called airy spiral) is peculiar to this particular type of mineral. Photographed using a "first order red plate" inserted into the microscope. [This presumably provides the red tint which differentiates this record from A200/184].

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Keywords: airy spiral, conoscopic figure, interference figure, interference pattern, light, optics, physics, quartz

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