How do isotropic crystals affect transmitted plane-polarized light?

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A rough, translucent yellow crystal of elemental sulfur displayed against a solid black background. — crystal A crystal form of elemental sulfur. Sulfur has an atomic weight of about 32.06 atomic mass units (amu), which means that its molar mass is 32.06 grams.

Optically isotropic crystals, which belong to the isometric system, do not alter the state of polarization of transmitted plane-polarized light. Because these crystals exhibit only one index of refraction for light of any given color, they do not cause double refraction. Consequently, light passing through an isotropic crystal maintains its original polarization direction without being split or rotated.1