Recognising a crenulation in a rock may require inspecting the rock with a hand-lens or petrographic microscope in thin section.
12.
Most commonly, rock and mineral samples are prepared as thin sections or grain mounts for study in the laboratory with a petrographic microscope.
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To observe the interference figure, true petrographic microscopes usually include an accessory called a Bertrand lens, which focuses and enlarges the figure.
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Under the petrographic microscope, a thin section of the mineral will display brilliant interference figures in greens or blues ( Moore, 1971 ).
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Petrographic microscopes are constructed with optical parts that do not add unwanted polarizing effects due to strained glass, or polarization by reflection in prisms and mirrors.
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Addition of plates between the polarizers of a petrographic microscope makes easier the optical identification of minerals in thin sections of optical indicatrices within the visible crystal sections.
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The two Nicol prisms ( occasionally referred to as " nichols " ) of the petrographic microscope have their polarizing planes oriented perpendicular to one another.
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The 2H polytype is pleochroic, meaning that the mineral changes colors ( in this case yellow and light yellow ) when viewed at different angles under a polarizing petrographic microscope.
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In addition to modifications of the microscope's optical system, petrographic microscopes allow for the insertion of specially-cut oriented filters of biaxial minerals ( the quartz wedge, order when needed.
20.
Its color in plane-polarized light is dark red, and it does not exhibit pleochroism, which means it does not appear to be a different color when observed at different angles under a polarizing petrographic microscope.
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