Abstract
The orthoscopic image is one where the mineral is viewed perpendicular to the path of light, whereas under conoscopic light the mineral is viewed simultaneously from different angles in a cone of light using the maximum aperture. Conditions for viewing a mineral in the conoscopic light path are:
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1.
Objective 40, 50 or 63 POL.
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2.
Condensing lens is swung into the light path. The aperture must be fully open.
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3.
Crossed polars.
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4.
Amici Bertrand lens (Fig. 1) is swung into the light path; for small crystals the iris diaphragm is used.
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© 1997 Chapman & Hall
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Pichler, H., Schmitt-Riegraf, C. (1997). Observations under conoscopic light. In: Rock-forming Minerals in Thin Section. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1443-8_3
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DOI: https://doi.org/10.1007/978-94-009-1443-8_3
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-7145-1
Online ISBN: 978-94-009-1443-8
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