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THE POLARIZING MICROSCOPE 9 THE POLARIZING MICROSCOPE
A SUMMARY OF THE PROPERTIES OF LIGHT
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aggregates albite alteration appear associates axes axial angle axial plane axis balsam bands biaxial Birefringence blue brown c-axis calcite characteristic cleavage cleavage traces Color.—Colorless common cross cross sections crossed nicols crystals dark determined diagram direction Dispersion distinctive Distinguishing euhedral extinction angle field fragments frequently give glass grains gray greater green Hexagonal igneous rocks illustrated indices of refraction interference colors interference figure Interference Figure.—The known length lens less light lines liquids lower maximum metamorphic method mica microscope mineral mineraloid moderate Monoclinic negative nicols normal objective observed occasionally occurs optic ordinary orientation Orthorhombic parallel parallel to 010 Pigeonite placed plate pleochroic polarized positive prism produced quartz rare Related Relief resembles sericite shown slide slow sometimes stage strong structure surface thickness thin sections tion twinning uniaxial usually varies variety wave weak yellow