levorotary quartz

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Rotary polarization — is an optical phenomenon occurring in certain crystalline materials. The vibrational direction of light passing through such a crystal (or sometimes liquids) is rotated so that it varies in a circular manner. The amount of polarization rotation… … Wikipedia
optical activity — Physical Chem. the ability of a substance to rotate the plane of polarization of plane polarized light. [1875 80] * * * Ability of a substance to rotate the plane of polarization of a beam of light passed through it, either as crystals or in… … Universalium

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