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- Laumontite abstract "Laumontite is a mineral, one of the zeolite group. Its molecular formula is Ca(AlSi2O6)2·4H2O, a hydrated calcium-aluminium silicate. Potassium or sodium may substitute for the calcium but only in very small amounts.It is monoclinic, space group C2/m. It forms prismatic crystals with a diamond-shaped cross-section and an angled termination. When pure, the color is colorless or white. Impurities may color it orange, brownish, gray, yellowish, pink, or reddish. It has perfect cleavage on [010] and [110] and its fracture is conchoidal. It is very brittle. The Mohs scale hardness is 3.5-4. It has a vitreous luster and a white streak.It is found in hydrothermal deposits left in calcareous rocks, often formed as a result of secondary mineralization. Host rock types include basalt, andesite, metamorphic rocks and granites.The identification of laumontite goes back to the early days of mineralogy. It was first named lomonite by R. Jameson (System of Mineralogy) in 1805, and laumonite by René Just Haüy in 1809. The current name was given by K.C. von Leonhard (Handbuch der Oryktognosie) in 1821. It is named after Gillet de Laumont who collected samples from lead mines in Huelgoat, Brittany, making them the type locality.Laumontite easily dehydrates when stored in a low humidity environment. When freshly collected, if it has not already been exposed to the environment, it can be translucent or transparent. Over a period of hours to days the loss of water turns it opaque white. In the past, this variety has been called leonhardite, though this is not a valid mineral species. The dehydrated laumontite is very friable, often falling into a powder at the slightest touch.It is a common mineral, found worldwide. It can be locally abundant, forming seams and veins. It is frequently associated with other zeolites, including stilbite and heulandite. Notable occurrences are India; Paterson, New Jersey; Pine Creek, California; Iceland; Scotland; and the Bay of Fundy, Nova Scotia. Prehnite pseudomorphs after laumontite (epimorphs) have been found in India.".
- Laumontite thumbnail Laumontita.jpg?width=300.
- Laumontite wikiPageExternalLink view_structure.pl?src=iza&id=LAU.
- Laumontite wikiPageExternalLink Laumontite.shtml.
- Laumontite wikiPageExternalLink min-2340.html.
- Laumontite wikiPageExternalLink ima98(13).pdf.
- Laumontite wikiPageID "2178786".
- Laumontite wikiPageRevisionID "557458757".
- Laumontite category "Tectosilicate - Zeolite group".
- Laumontite cleavage "Perfect, two directions".
- Laumontite color "White, colorless, yellowish, brownish,".
- Laumontite fracture "Uneven".
- Laumontite hasPhotoCollection Laumontite.
- Laumontite mohs "4".
- Laumontite name "Laumontite".
- Laumontite subject Category:Aluminium_minerals.
- Laumontite subject Category:Calcium_minerals.
- Laumontite subject Category:Monoclinic_minerals.
- Laumontite subject Category:Zeolites.
- Laumontite type Abstraction100002137.
- Laumontite type AluminiumMinerals.
- Laumontite type CalciumMinerals.
- Laumontite type Chemical114806838.
- Laumontite type Material114580897.
- Laumontite type Matter100020827.
- Laumontite type Mineral114662574.
- Laumontite type MonoclinicMinerals.
- Laumontite type Part113809207.
- Laumontite type PhysicalEntity100001930.
- Laumontite type Relation100031921.
- Laumontite type Softener115055936.
- Laumontite type Substance100019613.
- Laumontite type WaterSoftener115056112.
- Laumontite type Zeolite115106867.
- Laumontite type Zeolites.
- Laumontite type ChemicalSubstance.
- Laumontite type Mineral.
- Laumontite type ChemicalObject.
- Laumontite type Thing.
- Laumontite comment "Laumontite is a mineral, one of the zeolite group. Its molecular formula is Ca(AlSi2O6)2·4H2O, a hydrated calcium-aluminium silicate. Potassium or sodium may substitute for the calcium but only in very small amounts.It is monoclinic, space group C2/m. It forms prismatic crystals with a diamond-shaped cross-section and an angled termination. When pure, the color is colorless or white. Impurities may color it orange, brownish, gray, yellowish, pink, or reddish.".
- Laumontite label "Laumontiet".
- Laumontite label "Laumontit".
- Laumontite label "Laumontita".
- Laumontite label "Laumontite".
- Laumontite label "Laumontite".
- Laumontite label "Laumontite".
- Laumontite label "Laumontyt".
- Laumontite label "Ломонтит".
- Laumontite sameAs Laumontit.
- Laumontite sameAs Laumontita.
- Laumontite sameAs Laumontite.
- Laumontite sameAs Laumontite.
- Laumontite sameAs Laumontiet.
- Laumontite sameAs Laumontyt.
- Laumontite sameAs m.06srsj.
- Laumontite sameAs Q389444.
- Laumontite sameAs Q389444.
- Laumontite sameAs Laumontite.
- Laumontite wasDerivedFrom Laumontite?oldid=557458757.
- Laumontite depiction Laumontita.jpg.
- Laumontite isPrimaryTopicOf Laumontite.
- Laumontite name "Laumontite".