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Laumontite

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Francois Pierre Nicolas Gillet de Laumont
Formula:
CaAl2Si4O12 · 4H2O
System:
Monoclinic
Colour:
Colorless to pink, ...
Lustre:
Vitreous, Pearly
Hardness:
3½ - 4
Member of:
Name:
Named Laumonite by Abraham Gottlieb Werner in 1805 in honor of Francois Pierre Nicolas Gillet de Laumont [May 28, 1747 Laumont near Montmorency, France - June 1, 1834 Paris, France], Inspector General of Mines and who first found the mineral as well as plumbogummite. He was also a mineral collector. The name was changed to its current spelling, Laumontite, in 1821 by Karl Cäsar von Leonhard.
Zeolite Group. Laumontite Subgroup.

Normally it dehydrates in air to form a white powder. Specimens should be kept moist to prevent decomposition.


Classification of Laumontite

Approved, 'Grandfathered' (first described prior to 1959)
9.GB.10

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
B : Chains of single connected 4-membered rings
77.1.1.4

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
16.9.23

16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca

Physical Properties of Laumontite

Vitreous, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
Pearly on cleavage
Colour:
Colorless to pink, white, gray, yellowish, brownish, golden brown
Streak:
White
Hardness (Mohs):
3½ - 4
Tenacity:
Brittle
Cleavage:
Perfect
on {010}{110}
Fracture:
Irregular/Uneven
Density:
2.23 - 2.41 g/cm3 (Measured)    2.25 g/cm3 (Calculated)

Optical Data of Laumontite

Type:
Biaxial (-)
RI values:
nα = 1.502 - 1.514 nβ = 1.512 - 1.522 nγ = 1.514 - 1.525
2V:
Measured: 26° to 47°, Calculated: 34° to 44°
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v distinct

Chemical Properties of Laumontite

Formula:
CaAl2Si4O12 · 4H2O
IMA Formula:
Ca(Si4Al2)O12 · 4H2O
Elements listed in formula:
Common Impurities:
Na,K,Fe

Crystallography of Laumontite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 14.724(9) Å, b = 13.075(6) Å, c = 7.559(2) Å
β = 112.01(3)°
Ratio:
a:b:c = 1.126 : 1 : 0.578
Unit Cell Volume:
V 1,349.17 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Square prisms with steep oblique terminations, radiating, columnar, fibrous, massive
Twinning:
On {100}

Crystallographic forms of Laumontite

Crystal Atlas:
Image Loading
Click on an icon to view
Laumontite no.49 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

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Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Occurrences of Laumontite

Type Occurrence of Laumontite

Relationship of Laumontite to other Species

Member of:
Other Members of Group:
AlflarseniteNaCa2Be3Si4O13(OH) · 2H2O
AmiciteK2Na2Al4Si4O16 · 5H2O
Ammonioleucite(NH4,K)(AlSi2O6)
AnalcimeNa(AlSi2O6) · H2O
Barrerite(Na,K,Ca0.5)2[Al2Si7O18] · 7H2O
Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O
BikitaiteLiAlSi2O6 · H2O
BoggsiteCa8Na3(Si,Al)96O192 · 70H2O
Brewsterite-Ba(Ba,Sr)[Al2Si6O16] · 5H2O
Brewsterite-Sr(Sr,Ba,Ca)[Al2Si6O16] · 5H2O
Chabazite-Levyne SubgroupA subgroup of the Zeolite Group.
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
ClinoptiloliteNote on the distinguishing differences between clinoptilolite and heulandite (hhttp://rruff.
CowlesiteCaAl2Si3O10 · 6H2O
Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2O
Dachiardite-KK4(Si20Al4O48)·13H2O
Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2O
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2O
EdingtoniteBa[Al2Si3O10] · 4H2O
EpistilbiteCaAl2Si6O16 · 5H2O
ErioniteThis name now refers to a group of related minerals.
Faujasite SubgroupA subgroup of the Zeolite Group.
FerrieriteZeolite Group.
FerrochiavenniteCa1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2O
Flörkeite(K3Ca2Na)[Al8Si8O32] · 12H2O
Garronite-CaNa2Ca5Al12Si20O64 · 27H2O
GaultiteNa4Zn2Si7O18 · 5H2O
Gismondine-BaBa2Al4Si4O16 · 4-6H2O
Gismondine-CaCaAl2Si2O8 · 4H2O
GmeliniteIn 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K.
GobbinsiteNa5(Si11Al5)O32 · 11H2O
GoosecreekiteCa[Al2Si6O16] · 5H2O
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2O
Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
HeulanditeNote on the distinguishing differences between heulandite and clinoptilolite (http://rruff.
HsianghualiteCa3Li2(Be3Si3O12)F2
KirchhoffiteCs(BSi2O6)
LovdariteK2Na6Be4Si14O36 · 9H2O
MaricopaitePb7Ca2(Si,Al)48O100 · 32H2O
Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2O
Mazzite-NaNa8[Al4Si14O36]2 · 30H2O
Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O
Montesommaite(K,Na)9Al9Si23O64 · 10H2O
Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2O
MutinaiteNa3Ca4Si85Al11O192 · 60H2O
NabesiteNa2BeSi4O10 · 4H2O
Natrolite SubgroupA subgroup of the Zeolite Group.
OffretiteKCaMg(Si13Al5)O36 · 15H2O
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
ParthéiteCa2(Si4Al4) O15 (OH)2•4H2O
Paulingite-Ca(Ca,K,Na,Ba,◻)10 (Si, Al)42O84•34H2O
Paulingite-K(K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2O
Paulingite-Na(Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2O
PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O
PhillipsiteZeolite Group.
Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O
StelleriteCa4(Si28Al8)O72 · 28H2O
Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Stilbite-Na(Na,Ca,K)6-7[Al8Si28O72] · nH2O
Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2O
Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2O
Tschernichite(Ca,Na2)[Al2Si4O12] · 4-8H2O
TschörtneriteCa4(Ca,Sr,K,Ba)3Cu3[(OH)2|Al3Si3O12]4 · nH2O
WairakiteCa(Al2Si4O12) · 2H2O
WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2O
Wenkite(Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2O
WillhendersoniteKCa[Al3Si3O12] · 5H2O
YugawaraliteCaAl2Si6O16 · 4H2O
9.GB.05Ammonioleucite(NH4,K)(AlSi2O6)
9.GB.05AnalcimeNa(AlSi2O6) · H2O
9.GB.05HsianghualiteCa3Li2(Be3Si3O12)F2
9.GB.05LithositeK6Al4Si8O25 · 2H2O
9.GB.05LeuciteK(AlSi2O6)
9.GB.05Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
9.GB.05WairakiteCa(Al2Si4O12) · 2H2O
9.GB.05KirchhoffiteCs(BSi2O6)
9.GB.15YugawaraliteCaAl2Si6O16 · 4H2O
9.GB.20RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O
9.GB.25GoosecreekiteCa[Al2Si6O16] · 5H2O
9.GB.30Montesommaite(K,Na)9Al9Si23O64 · 10H2O
9.GB.35ParthéiteCa2(Si4Al4) O15 (OH)2•4H2O
16.9.1GehleniteCa2Al(AlSiO7)
16.9.2AnorthiteCa(Al2Si2O8)
16.9.3Yoshiokaite(Ca,Na)[Al(Al,Si)O4]
16.9.4SvyatoslaviteCa(Al2Si2O8)
16.9.5DmisteinbergiteCa(Al2Si2O8)
16.9.6GrossularCa3Al2(SiO4)3
16.9.7VuagnatiteCaAl(SiO4)(OH)
16.9.8Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
16.9.9Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
16.9.10PrehniteCa2Al2Si3O10(OH)2
16.9.11KamaishiliteCa2(Al2SiO6)(OH)2
16.9.12BicchuliteCa2(Al2SiO6)(OH)2
16.9.13MargariteCaAl2(Al2Si2O10)(OH)2
16.9.14ChantaliteCaAl2(SiO4)(OH)4
16.9.15CebolliteCa5Al2(SiO4)3(OH)4
16.9.17KatoiteCa3Al2(SiO4)3-x(OH)4x
16.9.18LawsoniteCaAl2(Si2O7)(OH)2 · H2O
16.9.19ParthéiteCa2(Si4Al4) O15 (OH)2•4H2O
16.9.20WairakiteCa(Al2Si4O12) · 2H2O
16.9.21VertumniteCa4Al4Si4O6(OH)24 · 3H2O
16.9.22ScoleciteCaAl2Si3O10 · 3H2O
16.9.24YugawaraliteCaAl2Si6O16 · 4H2O
16.9.25Gismondine-CaCaAl2Si2O8 · 4H2O
16.9.26EpistilbiteCaAl2Si6O16 · 5H2O
16.9.27GoosecreekiteCa[Al2Si6O16] · 5H2O
16.9.28CowlesiteCaAl2Si3O10 · 6H2O
16.9.30StelleriteCa4(Si28Al8)O72 · 28H2O
16.9.31SträtlingiteCa2Al2SiO7 · 8H2O
16.9.32AmstalliteCaAl(Si,Al)4O8(OH)4 · (H2O,Cl)

Other Names for Laumontite

Name in Other Languages:
Catalan:Laumontita
Hungarian:Laumontit
Italian:Laumontite
Luxembourgish:Laumontit
Polish:Laumontyt
Simplified Chinese:浊沸石
Slovak:Laumontit
Spanish:Laumontita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Laumontite

Reference List:
Jameson, R. (1805) Lomonite. System of Mineralogy II, Bell and Bradfute (Edinburgh, U.K.): 539-540.

Haüy, R.J. (1809) Laumonite. in Tableau Comparatif des Résultats de Cristallographie et de l'Analyse Chimique Relativement á la Classification des Minéraux, Courcier (Paris, France): 195-196.

von Leonhard, K.C. (1821) Laumontit. in Handbuch der Oryktognosie, Mohr and Winter (Heidelberg, Germany): 448-449.

Bartl, H., Fischer, K.F. (1967) Untersuchung der kristallstruktur des zeolithes laumontit. Neues Jahrbuch für Mineralogie, Monatshefte: 1967: 33-42.

Madsen, B.M., Murata, K.J. (1970) Occurrence of Laumontite in the Tertiary sandstones of the central Coast Ranges of California USGS PP 700-D: 188-195.

Bartl, H. (1970) Neues Jahrbuch für Mineralogie, Monatshefte: 1970: 298-310.

Thompson, A.B. (1970) Laumontite equilibria and the zeolite facies. American Journal of Science: 269: 267-275.

Liou, J.G. (1971) P-T stabilities of laumontite, wairakite, lawsonite, and related minerals in the system CaAl2Si2O8-SiO2-H2O. Journal of Petrology (1971): 12: 379.

Bartl, H. (1990) Strukturverfeinerung van Leonhardit, Ca[Al2Si4O12]·3H2O, mittels N eutronenbeugung. Neues Jahrbuch für Mineralogie, Monatshefte: 1990: 298-310.

Armbruster, T., Kohler, T. (1992) Re- and dehydration of laumontite: a single crystal X-ray study at 100 K. Neues Jahrbuch für Mineralogie, Monatshefte: 1992: 385-397.

Tschernich, R. (1992) Zeolites of the world. Geoscience Press Inc., Phoenix, AZ, USA, 563 pp. [freely downloadable: http://www.mindat.org/books/Zeolites-of-the-World-Updated.pdf]

Artioli, G., Stahl, K. (1993) Fully hydrated laumontite: A structure study by flat-plate and capillary powder diffraction techniques. Zeolites: 13: 249-255.

Jambor, J.L., Puziewicz, J. (1993) New mineral names. American Mineralogist: 78: 450-455.

Ståhl, K., Artioli, G. (1993) A neutron powder diffraction study of fully deuterated laumontite. European Journal of Mineralogy: 5: 851.

Ståhl, K., Artioli, G., Hanson, J.C. (1996) The dehydration process in the zeolite laumontite: a real-time synchrotron X-ray powder diffraction study. Physics and Chemistry of Minerals: 23: 328.

Coombs, D.S., Alberti, A., Armbruster, T., Artioli, G., Colella, C., Galli, E., Grice, J.D., Liebau, F., Mandarino, J.A., Minato, H., Nickel, E.H., Passaglia, E., Peacor, D.R., Quartieri, S., Rinaldi, R., Ross, M., Sheppard, R.A., Tillmanns, E., Vezzalini, G. (1997) Recommended nomenclature for zeolite minerals: report of the Subcommittee on Zeolites of the International Mineralogical Association, Commission on New Minerals and Mineral Names. The Canadian Mineralogist: 35: 1571-1606.

Armbruster, T., Gunter, M.E. (2001) Crystal Structures of Natural Zeolites. Reviews in Mineralogy and Geochemistry: 45: 1-67.

Passaglia, E., Sheppard, R.A. (2001) The Crystal Chemistry of Zeolites. Reviews in Mineralogy and Geochemistry: 45: 69-116.

Chipera, S.J., Apps, J.A. (2001) Geochemical Stability of Natural Zeolites. Reviews in Mineralogy and Geochemistry: 45: 117.

Fridriksson, T., Bish, D.L., Bird, D.K. (2003) Hydrogen-bonded water in laumontite I: X-ray powder diffraction study of water site occupancy and structural changes in laumontite during room-temperature isothermal hydration/dehydration. American Mineralogist: 88: 277.

Lee, Y., Hriljac, J.A., Vogt. T. (2004) Pressure-induced migration of zeolitic water in laumontite. Physics and Chemistry of Minerals: 31: 421-428.

Internet Links for Laumontite

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Specimens:
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