Clintonite


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clintonite

[′klint·ən‚īt]
(mineralogy)
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 It might be outdated or ideologically biased.

Clintonite

 

(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.
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