thomsonite


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thomsonite

[′täm·sə‚nīt]
(mineralogy)
NaCa2 Al5Si5O20·6H2O Snow-white zeolite mineral forming orthorhombic crystals and occurring in masses of radiating crystals; hardness is 5-5.5 on Mohs scale.
References in periodicals archive ?
Thomsonite is the most common zeolite phase formed after nontronite/celadonite Chabazite, analcime, phillipsite and probably wairakite are the irst zeolites which became crystallised.
Thomsonite was the most common zeolite phase formed after nontronite/celadonite Na-rich zeolites such as chabazite, analcime, phillipsite and probably wairakite were the first zeolites that became crystallised.
Structural classification Identified zeolitic phases Heulandite group (C4-C4-T1) stellerite, stilbite, stellerite-Na, Stilbite-Ca Chabazite group (C6) chabazite, levyne, chabazite-Ca, chabazite-Na Analcime group (C4-C4) analcime, wairakite, analcime-Mg Natrolite group (C4-T1) natrolite, thomsonite, thomsonite-Ca Phillipsite group (C4) phillipsite, phillipsite-Na Laumontite group (C8) laumontite
We have not identified thomsonite, reported by Booth (1994).
Analcime and natrolite are abundant, mesolite and stilbite are common, and thomsonite, chabazite, laumontite, and "heulandite" are rare.
Thomsonite, mesolite, and wairakite have narrow compositional ranges.
Nine types of zeolite were identified: epistilbite, scolecite, stilbite, stellerite, heulandite (sensu stricto), clinoptilolite, mesolite, thomsonite, and rare analcime (Table 2).
Heulandite", mesolite, stilbite, thomsonite, natrolite, tetranatrolite, and epistilbite have been analysed from both the North Shore and Arlington Quarry and can therefore be compared.
Thomsonite from Arlington Quarry is generally white, dull, and massive with Si/Al average of 1.
In contrast, on the North Shore, all epistilbite, thomsonite, and mesolite analyses lie in this field, together with wairakite and many chabazite analyses, two minerals not analyzed from Kings County.