pleochromatism

Definition

Pleochromatism (noun): The property of a material, especially a mineral or crystal, of exhibiting different colors when viewed from different directions, typically due to variations in the absorption of light in different crystallographic orientations.

Usage Examples

• (The stone shows different colors depending on the viewing direction.)
• (Scientists use color changes to analyze crystal properties.)

Advanced Usage

• "Pleochromatism in thin sections": In petrology, pleochromatism is observed in thin slices of minerals under a polarizing microscope.

  • The thin section revealed strong pleochromatism, indicating a high degree of crystallographic orientation. (The color variation was clear under the microscope.)

• "Pleochromatism versus dichroism": Pleochromatism is a broader term; dichroism refers specifically to two-color variations, while pleochromatism can involve multiple colors.

  • The mineral's pleochromatism was so pronounced that it showed blue, green, and yellow hues. (More than two colors were visible.)

Variants and Related Words

• Pleochroic (adjective): Describing a material that exhibits pleochromatism.

  • The pleochroic crystal changed color as it was rotated. (The crystal displayed color variation.)

• Pleochroism (noun): A synonym for pleochromatism, more commonly used in scientific contexts.

  • Pleochroism is a key feature of many gemstones like tourmaline. (The property of color change in gems.)

Synonyms

• Pleochroism: The primary synonym, referring to the same optical property.
• Dichroism: A specific type of pleochromatism showing only two colors (less common as a direct synonym).

Related Idioms