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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.



(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.

References in periodicals archive ?
That meaning is consonant with the Clintonite critique, but it doesn't completely do it justice.
He will be going down tonight to opening day with a large group of Clintonites who have attended the opening day game every year for decades.
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Meanwhile, former Clintonite Lanny Davis has an op-ed piece in The Washington Post arguing that the 2006 elections showed that people are "tired of the partisan gridlock in Washington.
Lake first heard of Obama in 2002, when the former Clintonite was in Chicago giving a speech.
Soon this became the official Clintonite line, and members of Congress (including Gary Condit) who only days before had been signaling that Clinton's goose was cooked were suddenly inclined to criticize Starr instead, for the alleged prurience of his interest in Clinton's sex life.
No matter his team of economic hit men includes a whole slew of Clintonite neoliberals like Robert Rubin.
Not, mind you, that Trudeau was a libertarian then, any more than he was a Clintonite 20 years later.
However, these days pretty much everybody honest, Bosnian and foreign alike, admits that Dayton, the crown jewel of Clintonite diplomacy, has failed miserably.