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n.1.(Min.) A zeolitic mineral, occurring generally in masses of a radiated structure. It is a hydrous silicate of aluminia, lime, and soda. Called also mesole, and comptonite.
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Thomsonite varies in habit showing bladed crystals, spherulites, radial crystal groups and rich coatings mainly made up of small crystals, although it sometimes has a fibrous nature Analcime appears as vitreous and granular well-formed trapezohedral crystals which are often colourless and sometimes white Natrolite is generally beige to white, either massive or forming radiating fibers and shows a more glassy brightness than mesolite, which is generally milky white and fibrous, having larger fibers than those of natrolite Stilbite commonly occurs as vitreous sheaves or plates, ranging from colourless to green to white
Huvitavad on Thomsonite kaaslinlase, eestlanna Elsebet Pareki tahelepanekud, kes kirjutas sakslaste lahkumisega seonduvalt jargmiselt:
Unlike Indian specimens showing dirty white, smooth-surfaced thomsonite spheres which appeared a few years ago, these specimens are quite pretty.
The most frequent species of zeolites are stibnite, chabasite, laumontite, mesolite/mordenite, thomsonite, and analcim.
1980), phillipsite by Rychly and Barta (1981) and epitaxial intergrowths and overgrowths of natrolite and thomsonite by Ulrych and Rychly (1986).
They are "heulandite" (heulandite sensu stricto and clinoptilolite), chabazite, analcime, stilbite, barrerite, epistilbite, gmelinite, laumontite, natrolite, mesolite, scolecite, stellerite, tetranatrolite, thomsonite, and wairakite.
Access to this scarily remote place is achieved only by helicopter, and, according to Mikhail, 1994 was the last year in which the region produced specimens that were marketed in the West (see the mentions of thomsonite and other zeolites from "Yakutia" and "the Tura region" in show reports in September-October 1992 and May-June 1993 respectively).
Moyd (1949) mentioned zeolites associated with a band of nepheline-bearing rocks in the Bancroft, Ontario area, and Corriveau (1985) noted thomsonite in an alkalic syenite from Lac Rouge, Labelle Co.
Opaque, pale creamy orange thomsonite spheres and hemispheres rest singly, or are lightly intergrown to form crusts, directly on basalt matrix; the spheres reach 7 cm in diameter, and matrix plates liberally strewn with spheres reach 30 cm across.
Relationship to othe r species: It is a member of the zeolite group, specifically the thomsonite series.
Thomsonite has been found as a rare mineral in the Bor pit.