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Francois Pierre Nicolas Gillet de Laumont
CaAl2Si4O12 · 4H2O
Colorless to pink, white, gray, yellowish, brownish, golden brown
Vitreous, Pearly
3½ - 4
Specific Gravity:
2.23 - 2.41
Crystal System:
Member of:
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.

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Classification of LaumontiteHide

Approved, 'Grandfathered' (first described prior to 1959)

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

1 : Zeolite group - True zeolites

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

Physical Properties of LaumontiteHide

Vitreous, Pearly
Transparent, Translucent
Pearly on cleavage
Colorless to pink, white, gray, yellowish, brownish, golden brown
3½ - 4 on Mohs scale
on {010}{110}
2.23 - 2.41 g/cm3 (Measured)    2.25 g/cm3 (Calculated)

Optical Data of LaumontiteHide

Biaxial (-)
RI values:
nα = 1.502 - 1.514 nβ = 1.512 - 1.522 nγ = 1.514 - 1.525
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:
r < v distinct

Chemical Properties of LaumontiteHide

CaAl2Si4O12 · 4H2O
IMA Formula:
Ca(Si4Al2)O12 · 4H2O
Common Impurities:

Crystallography of LaumontiteHide

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

Crystallographic forms of LaumontiteHide

Crystal Atlas:
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Laumontite no.49 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by

Edge Lines | Miller Indicies | Axes

Opaque | Translucent | Transparent

Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation

X-Ray Powder DiffractionHide

Image Loading

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

Type Occurrence of LaumontiteHide

Synonyms of LaumontiteHide

Other Language Names for LaumontiteHide

Simplified Chinese:浊沸石

Varieties of LaumontiteHide

CaporcianiteA white, friable, massive variety of laumontite.
LeonharditeA name for partially dehydrated, opaque laumontite.
Vanadio-laumontiteA vanadian Laumontite variety.
Originally reported from Tyuya-Muyun Cu-V-U Deposit (Radium Mine), Fergana Valley, Osh Oblast, Kyrgyzstan.

Relationship of Laumontite to other SpeciesHide

Member of:
Other Members of this group:
AlflarseniteNaCa2Be3Si4O13(OH) · 2H2OMon. 2 : P21
AmiciteK2Na2Al4Si4O16 · 5H2OMon. 2
AnalcimeNa(AlSi2O6) · H2OTric.
Barrerite(Na,K,Ca0.5)2[Al2Si7O18] · 7H2OOrth. mmm (2/m 2/m 2/m)
Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2OHex.
BikitaiteLiAlSi2O6 · H2OTric. 1 : P1
BoggsiteCa8Na3(Si,Al)96O192 · 70H2OOrth. mmm (2/m 2/m 2/m) : Imma
Brewsterite-Ba(Ba,Sr)[Al2Si6O16] · 5H2OMon. 2/m : P21/m
Brewsterite-Sr(Sr,Ba,Ca)[Al2Si6O16] · 5H2O
Chabazite-Levyne SubgroupA subgroup of the Zeolite Group.
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2OMon. 2/m : P21/b
ClinoptiloliteNote on the distinguishing differences between clinoptilolite and heulandite (hhttp://rruff.
CowlesiteCaAl2Si3O10 · 6H2OOrth.
Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2OMon.
Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2OMon.
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2OOrth. mmm (2/m 2/m 2/m) : Pmmn
EdingtoniteBa[Al2Si3O10] · 4H2O
EpistilbiteCaAl2Si6O16 · 5H2OMon.
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] · 2H2OMon. 2/m : P21/b
Flörkeite(K3Ca2Na)[Al8Si8O32] · 12H2OTric. 1 : P1
Garronite-CaNa2Ca5Al12Si20O64 · 27H2OTet. 4 2m : I4m2
GaultiteNa4Zn2Si7O18 · 5H2OOrth. mm2 : Fdd2
Gismondine-BaBa2Al4Si4O16 · 4-6H2O
Gismondine-CaCaAl2Si2O8 · 4H2O
GmeliniteIn 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K.
GobbinsiteNa5(Si11Al5)O32 · 11H2OOrth.
GoosecreekiteCa[Al2Si6O16] · 5H2OMon.
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2OOrth.
Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2OMon. 2/m : P21/m
HeulanditeNote on the distinguishing differences between heulandite and clinoptilolite (http://rruff.
KirchhoffiteCs(BSi2O6)Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
LovdariteK2Na6Be4Si14O36 · 9H2OOrth. mm2
MaricopaitePb7Ca2(Si,Al)48O100 · 32H2OOrth.
Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2OHex.
Mazzite-NaNa8[Al4Si14O36]2 · 30H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2OOrth.
Montesommaite(K,Na)9Al9Si23O64 · 10H2OOrth.
Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2OOrth.
MutinaiteNa3Ca4Si85Al11O192 · 60H2OOrth.
NabesiteNa2BeSi4O10 · 4H2OOrth. 2 2 2 : P21 21 21
Natrolite SubgroupA subgroup of the Zeolite Group.
OffretiteKCaMg(Si13Al5)O36 · 15H2OHex. 6 m2 : P6m2
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 2 3 : I2 3
ParthéiteCa2(Si4Al4) O15 (OH)2•4H2OMon. 2/m : B2/b
Paulingite-Ca(Ca,K,Na,Ba,◻)10 (Si, Al)42O84•34H2OIso.
Paulingite-K(K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2OIso.
Paulingite-Na(Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2OIso.
PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2OHex.
PhillipsiteZeolite Group.
Pollucite(Cs,Na)2(Al2Si4O12) · 2H2OIso. m3m (4/m 3 2/m) : Ia3d
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2OTet.
StelleriteCa4(Si28Al8)O72 · 28H2OOrth. mmm (2/m 2/m 2/m) : Fmmm
Stilbite-CaNaCa4[Al9Si27O72] · nH2OMon. 2/m : B2/m
Stilbite-Na(Na,Ca,K)6-7[Al8Si28O72] · nH2OMon. 2/m : B2/m
Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2OOrth.
Thomsonite-CaNaCa2[Al5Si5O20] · 6H2OOrth. mmm (2/m 2/m 2/m)
Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2OOrth. mmm (2/m 2/m 2/m)
Tschernichite(Ca,Na2)[Al2Si4O12] · 4-8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mmm
TschörtneriteCa4(Ca,Sr,K,Ba)3Cu3[(OH)2|Al3Si3O12]4 · nH2OIso. m3m (4/m 3 2/m) : Fm3m
WairakiteCa(Al2Si4O12) · 2H2OMon. 2/m
WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2OMon.
Wenkite(Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2OHex.
WillhendersoniteKCa[Al3Si3O12] · 5H2OTric.
YugawaraliteCaAl2Si6O16 · 4H2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Prehnite172 photos of Laumontite associated with Prehnite on
Calcite159 photos of Laumontite associated with Calcite on
Stilbite135 photos of Laumontite associated with Stilbite on
Quartz104 photos of Laumontite associated with Quartz on
Heulandite-Ca58 photos of Laumontite associated with Heulandite-Ca on
Heulandite55 photos of Laumontite associated with Heulandite on
Gyrolite48 photos of Laumontite associated with Gyrolite on
Fluorapophyllite-(K)46 photos of Laumontite associated with Fluorapophyllite-(K) on
Okenite41 photos of Laumontite associated with Okenite on
Apophyllite36 photos of Laumontite associated with Apophyllite on

Related Minerals - Nickel-Strunz GroupingHide

9.GB.05AnalcimeNa(AlSi2O6) · H2OTric.
9.GB.05LithositeK6Al4Si8O25 · 2H2OMon.
9.GB.05LeuciteK(AlSi2O6)Tet. 4/m : I41/a
9.GB.05Pollucite(Cs,Na)2(Al2Si4O12) · 2H2OIso. m3m (4/m 3 2/m) : Ia3d
9.GB.05WairakiteCa(Al2Si4O12) · 2H2OMon. 2/m
9.GB.05KirchhoffiteCs(BSi2O6)Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.GB.15YugawaraliteCaAl2Si6O16 · 4H2OMon.
9.GB.20RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2OTet.
9.GB.25GoosecreekiteCa[Al2Si6O16] · 5H2OMon.
9.GB.30Montesommaite(K,Na)9Al9Si23O64 · 10H2OOrth.
9.GB.35ParthéiteCa2(Si4Al4) O15 (OH)2•4H2OMon. 2/m : B2/b

Related Minerals - Dana Grouping (8th Ed.)Hide · H2OTric.,Na)2(Al2Si4O12) · 2H2OIso. m3m (4/m 3 2/m) : Ia3d · 2H2OMon. 2/m 4/mmm (4/m 2/m 2/m) : I41/acd

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.9.1GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
16.9.2AnorthiteCa(Al2Si2O8)Tric. 1 : P1
16.9.3Yoshiokaite(Ca,Na)[Al(Al,Si)O4]Trig. 3 : P3
16.9.5DmisteinbergiteCa(Al2Si2O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
16.9.6GrossularCa3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
16.9.8Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
16.9.9Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
16.9.10PrehniteCa2Al2Si3O10(OH)2Orth. mm2
16.9.12BicchuliteCa2(Al2SiO6)(OH)2Iso. 4 3m : I4 3m
16.9.14ChantaliteCaAl2(SiO4)(OH)4Tet. 4/m : I41/a
16.9.18LawsoniteCaAl2(Si2O7)(OH)2 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
16.9.19ParthéiteCa2(Si4Al4) O15 (OH)2•4H2OMon. 2/m : B2/b
16.9.20WairakiteCa(Al2Si4O12) · 2H2OMon. 2/m
16.9.21VertumniteCa4Al4Si4O6(OH)24 · 3H2OMon. 2/m : P21/m
16.9.22ScoleciteCaAl2Si3O10 · 3H2OMon. m : Bb
16.9.24YugawaraliteCaAl2Si6O16 · 4H2OMon.
16.9.25Gismondine-CaCaAl2Si2O8 · 4H2O
16.9.26EpistilbiteCaAl2Si6O16 · 5H2OMon.
16.9.27GoosecreekiteCa[Al2Si6O16] · 5H2OMon.
16.9.28CowlesiteCaAl2Si3O10 · 6H2OOrth.
16.9.30StelleriteCa4(Si28Al8)O72 · 28H2OOrth. mmm (2/m 2/m 2/m) : Fmmm
16.9.31SträtlingiteCa2Al2SiO7 · 8H2OTrig.
16.9.32AmstalliteCaAl(Si,Al)4O8(OH)4 · (H2O,Cl)Mon. 2/m : B2/b

Other InformationHide

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 LaumontiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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:]
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 LaumontiteHide

Localities for LaumontiteHide

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