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Reflectance spectra of kaolinite, montmorillonite, and alunite are markedly different in the 2.0-to-2.4-
Dual optical trains provide electrical signals representing the reflectance of an unknown mineral at two different wavelengths. Electronic circuitry computes and displays the ratio of the two reflectances.
Petallike panels unfold from a central fixed section to create an inner reflector dish. This reflector uses only one ring of panels. For clarity, the transmitter/receiver tripod assembly is not shown.