Swedenborgite | Article about swedenborgite by The Free Dictionary
NaBe4SbO7 A colorless to wine-yellow mineral composed of sodium beryllium antimony oxide.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Examples include swedenborgite
(which contains the scarce combination of beryllium and antimony) and any mineral that includes tellurium, which on average is found in Earth's crust at concentrations of 5 parts per billion.