accessory plate

accessory plate

[ak′ses·ə·rē ‚plāt]
(optics)
Thin plate of quartz, gypsum, or mica used with a petrological microscope to modify the effects of polarized light and intensify qualities in translucent minerals.
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References in periodicals archive ?
There is also an option to bolt on custom accessory plates for more unique applications.
Accessory plates from Lenox are good, and Fitz & Floyd being in the accent plate business again has been good for us.