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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 and and its fracture
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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
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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
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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.
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It is a common mineral, found worldwide. It can be locally abundant, forming seams and veins. It is frequently associated with other zeolites, including
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in 1809. The current name was given by K.C. von
Leonhard (Handbuch der Oryktognosie) in 1821. It is named after
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Sedimentary geology : an introduction to sedimentary rocks and stratigraphy
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The identification of laumontite goes back to the early days of
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may substitute for the calcium but only in very small amounts.
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271:(System of Mineralogy) in 1805, and laumonite by
341:after laumontite (epimorphs) have been found in
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426:Prothero, Donald R.; Schwab, Fred (2004).
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279:who collected samples from lead mines in
231:is conchoidal. It is very brittle. The
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120:White, colorless, yellowish, brownish
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364:"IMA–CNMNC approved mineral symbols"
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413:Field Guide to Rocks and Minerals
411:National Audubon Society (1979).
185:group. Its molecular formula is
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306:. Notable occurrences are
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507:Minerals in space group 12
460:IMA Zeolite Classification
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415:. Alfred A. Knopf, Inc.
130:Perfect, two directions
368:Mineralogical Magazine
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455:Webmineral Laumontite
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61:Strunz classification
512:Luminescent minerals
312:Paterson, New Jersey
502:Monoclinic minerals
389:10.1180/mgm.2021.43
380:2021MinM...85..291W
362:Warr, L.N. (2021).
170:Laumontite crystals
492:Aluminium minerals
472:Structure type LAU
287:, making them the
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450:Mindat Laumontite
277:Gillet de Laumont
254:sedimentary rocks
246:metamorphic rocks
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487:Calcium minerals
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112:Identification
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328:Bay of Fundy
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332:Nova Scotia
101:Space group
481:Categories
437:0716739054
349:References
326:; and the
316:California
304:heulandite
269:R. Jameson
265:mineralogy
258:diagenesis
175:Laumontite
158:References
146:Mohs scale
92:H-M symbol
76:Monoclinic
51:IMA symbol
19:Laumontite
398:235729616
221:Potassium
497:Zeolites
336:Prehnite
324:Scotland
300:stilbite
285:Brittany
281:Huelgoat
250:granites
242:andesite
210:· 4
149:hardness
136:Fracture
126:Cleavage
45:Zeolites
38:Category
376:Bibcode
320:Iceland
183:zeolite
179:mineral
65:9.GB.10
33:General
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238:basalt
225:sodium
140:Uneven
90:(same
394:S2CID
343:India
308:India
177:is a
117:Color
432:ISBN
302:and
248:and
233:Mohs
106:C2/m
384:doi
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223:or
55:Lmt
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195:Si
192:Al
188:Ca
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217:O
215:2
212:H
208:2
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204:6
201:O
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