bead test

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bead test

n.
A test to identify the metal constituents of a mineral in which a bead covered with the mineral is heated in a flame and cooled to observe its characteristic color and other properties.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.