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A dark green or greenish-black silicate mineral, Be2FeY2Si2O10, containing several of the rare-earth elements in combination with iron.

[After Johan Gadolin (1760-1852), Finnish chemist.]
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) a rare brown or black mineral consisting of a silicate of iron, beryllium, and yttrium in monoclinic crystalline form. Formula: 2BeO.FeO.Y2O3.2SiO2. Also called: ytterbite
[C19: named after Johan Gadolin (1760–1852), Finnish mineralogist]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈgæd l əˌnaɪt)

a silicate mineral from which the rare-earth metals gadolinium, holmium, and rhenium are extracted.
[1795–1805; after J. Gadolin (1760–1852), Finnish chemist; see -ite1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.gadolinite - a mineral that is a source of rare earthsgadolinite - a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium
atomic number 4, Be, beryllium, glucinium - a light strong brittle grey toxic bivalent metallic element
atomic number 58, Ce, cerium - a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group
atomic number 68, Er, erbium - a trivalent metallic element of the rare earth group; occurs with yttrium
atomic number 64, gadolinium, Gd - a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group
atomic number 67, Ho, holmium - a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds
atomic number 65, Tb, terbium - a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite
atomic number 70, Yb, ytterbium - a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime
atomic number 39, Y, yttrium - a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The first rare earth mineral to be discovered was 'ytterbite' (later renamed to gadolinite) in 1787, a mineral composed of iron, silicon, yttrium and cerium, among other elements.
Mineralogical work completed by the company indicated that a wide variety of rare-earth element-bearing minerals have been identified, including apatite, iimoriite, kainosite, gadolinite, allanite, bastnaesite, parisite, brannerite, thalenite, xenotime, fergusonite, synchysite (Y), and monazite.
The moniker originates from their first discovery, in a so-called rare earth mineral (an uncommon oxide-type mineral) called gadolinite, in an abandoned mine outside the village of Ytterby in Sweden by Karl Arrhenius, a Swedish army lieutenant and amateur mineralogy student, in 1787.
Rare-earth element minerals including gadolinite were sporadically mined at the Riemvasmaak pegmatite over 50 years ago.
Datolite ([CaBSiO.sub.4]) is structurally classified as an orthosilicate and is a member of the Gadolinite Group of minerals.
The Cooglegong area, possibly the Trigg Hill pegmatites, is the type locality for formanite and tanteuxenite and is also known for its yttrotantalite, fergusonite and gadolinite. The Pilgangoora pegmatite field is the type locality for ferrocolumbite.