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Ca(Mg,Al)3(Al,Si)O10(OH)2 A reddish-brown, copper-red, or yellowish monoclinic mineral of the brittle mica group occurring in crystals or foliated masses. Also known as seybertite; xanthophyllite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(also seybertite, xanthophyllite), a micaceous mineral, a lamellar silicate of the “brittle mica” group; its chemical composition is Ca(Mg, Al)3-2 [Al2Si2O10](OH)2. Clintonite forms brittle, foliated monoclinic crystals, as well as plumose, sometimes radiating, aggregates. It is colorless; some varieties vary in color from yellow to green, owing to an admixture of FeO (for example, valuevite). It has a hardness of 4—6 (hardness is greater along the lateral faces of the crystals than on the cleavage surfaces) on the mineralogical scale and a density of 3,000–3,100 kg/m3. Clintonite usually occurs in contact-metasomatic formations in metamorphosed dolomites and magnesian metamorphic schists with garnet, spinel, magnesioferrite, perovskite, talc, chlorite, and other minerals.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
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(Old epidote specimens from both localities are sometimes labeled "Sulzer," after an abandoned mining settlement at the head of Hetta Inlet several kilometers to the northwest of Copper Mountain.) Of the hundreds of samples of epidote, quartz, pyrite, clintonite, orthoclase and other species we recovered, only a small percentage were specimen-quality.
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American terms such as Clintonite and October Surprise are included, plus two conspiracy terms - deep throat and grassy knoll.
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Large crystals of clintonite have been found there since 1916, but in 2001 some extraordinary crystals up to 4.2 cm across were recovered.
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