Laumontite


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Related to Laumontite: Pumpellyite

Lau´mont`ite


n.1.(Min.) A mineral, of a white color and vitreous luster. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles.
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By experimental analysis, the main mineral composition of the tested sandstone is 29% albite, 23% quartz, 15% calcite, 13% laumontite, 9% kaolinite, 7% illite, and 4% other minerals.
There are many species of zeolites, such as Analcime, Chabazite, Clinoptilolite, Faujasite, Ferrierite, Heulandite, Laumontite, Mordenite.
Geological Survey has reported natural zeolites' worldwide occurrence in the USA, Japan, Korea, Bulgaria, Czechoslovakia, Romania, Hungary, Russia, Yugoslavia, South Africa, Italy, Germany, Turkey and China, the latter having the greatest worldwide production Clinoptilolite, mordenite, heulandite, chabazite, phillipsite and laumontite are some of the more than 40 known natural zeolites occurring in reasonably high quantities and purity.
The mineral leonhardite was named in his honor by Johann Reinhard Blum (1802-1883) in 1843, but it was later discredited as [H.sub.2]O-poor laumontite.
At Peter's Point, he also made extensive collections of zeolite minerals, the most abundant, being laumontite, Ca[Al.sub.2][Si.sub.4][O.sub.12] x 4[H.sub.2]O, a white, vitreous zeolite that forms small prismatic crystals.
Other minor constituents of marbles can include fluorite, apatite, brucite, laumontite, olivine, scheelite, spinel, zoisite, and magnetite.
van de Kamp, "Diagenetic mineralogy and controls on albitization and laumontite formation in Paleogene arkoses, Santa Ynez Mountains, California," AAPG Memoir, vol.
A basalt quarry near the town of Sambava is the site of Madagascar's first known occurrence of calcite, stilbite, laumontite and heulandite in fine specimens.
They are "heulandite" (heulandite sensu stricto and clinoptilolite), chabazite, analcime, stilbite, barrerite, epistilbite, gmelinite, laumontite, natrolite, mesolite, scolecite, stellerite, tetranatrolite, thomsonite, and wairakite.
Hacker, "Experimental investigation of laumontite [right arrow] wairakite + [H.sub.2]O: a model diagenetic reaction," American Mineralogist, vol.
Victor's pieces show intricate, generally triangular, multiple twins of the transparent, pale yellow to yellow-brown calcite, some crystals hosting snowy excrescences of tiny stilbite and laumontite crystals.