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An orange-red to grayish yellow mixture of several uranium oxides, silicates, and salts occurring naturally in the oxidation and hydration of uraninite.

[German Gummit, from Gummi, gum, from Middle High German, from Medieval Latin, from Latin; see gum1.]
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.


(Minerals) an orange or yellowish amorphous secondary mineral consisting of hydrated uranium oxides
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.gummite - a gummy orange mixture of uranium oxides and silicates occurring naturally in the hydration and oxidation of pitchblende
mixture - (chemistry) a substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding)
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References in periodicals archive ?
A feature display of rich uranium ores from Grafton, New Hampshire shows uraninite and gummite in strongly contrasting specimens.
Nonoxidized (primary) ones consisted mainly of nasturan (80-90%) with black, gummite and uranium mica.
Comblainite is found in millimeter-thick beds of turquoise-blue masses, and also yellow to yellowish green masses in association with gummite. Under the microscope, irregular crystals up to 10 microns in size can be seen (Piret and Deliens, 1980).