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This citation summarizes a one-page announcement of technology available for utilization. A hand-held optical instrument aids in identifying minerals in the field. It can be used in exploration for minerals on foot or by aircraft. The instrument -- a radiometer -- is especially suitable for identifying clay and carbonate minerals. It bases its identifications on the characteristic distributions of wavelengths in Sunlight reflected by minerals. Essentially, the radiometer measures the reflectances of a mineral at two wavelengths, computes the ratio of he reflectances, and displays the ratio to the user. ...FOR ADDITIONAL INFORMATION: Contact: Technology Transfer Div., P.O. Box 8757, BWI Airport, MD 21240. Refer to NPO-15234.