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pleochroism
This term is a specialized technical descriptor used primarily in mineralogy, gemology, and biology. It describes a specific physical property of light absorption rather than a simple change in color caused by external chemicals or temperature. In a professional context, it is used to identify and authenticate gemstones, as the specific colors exhibited at different axes serve as a diagnostic fingerprint for the mineral.
Because it refers to a specific optical phenomenon, the word is treated as an uncountable noun. It describes the quality or the state of being pleochroic, rather than a discrete object that can be counted.
Meanings
Examples
The geologist explained that pleochroism is a key diagnostic feature for identifying certain minerals.
The geologist explained that pleochroism is a key diagnostic feature for identifying certain minerals.
Look at how the color shifts as I rotate the crystal under the microscope.
This sapphire exhibits strong pleochroism, appearing blue from one angle and slightly violet from another.
This sapphire exhibits strong pleochroism, appearing blue from one angle and slightly violet from another.
I wonder if this specimen shows any sign of pleochroism when viewed through a polarizer.
The textbook describes pleochroism as the result of selective light absorption along different crystallographic axes.
The textbook describes pleochroism as the result of selective light absorption along different crystallographic axes.
Is this effect caused by pleochroism or is it just a reflection of the ambient light?
Tourmaline is famous for its vivid pleochroism, often showing green and red hues simultaneously.
Tourmaline is famous for its vivid pleochroism, often showing green and red hues simultaneously.
The researcher noted the degree of pleochroism in the thin section of the rock sample.