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Natrolite

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Formula:
Na2Al2Si3O10 · 2H2O
System:
Orthorhombic
Colour:
White, Colorless, Red, ...
Hardness:
5 - 5½
Member of:
Name:
Named in 1803 by Martin H. Klaproth from the Greek natron, "soda," in allusion to its sodium content and lithos, "stone." Not to be confused with natrolite (of William Hyde Wollaston) in 1812 for a soda-bearing scapolite.
Dimorph of:

Classification of Natrolite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.GA.05

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
A : Zeolites with T5O10 Units – The Fibrous Zeolites
Dana 7th ed.:
77.1.5.1
77.1.5.1

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
16.2.5

16 : Silicates Containing Aluminum and other Metals
2 : Aluminosilicates of Na
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First Recorded Occurrence of Natrolite

Year of Discovery:
1803

Occurrences of Natrolite

Geological Setting:
Cavities in amygdaloidal basalts

Physical Properties of Natrolite

Vitreous, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
White, Colorless, Red, Yellow, Brown, Green, bluish
Streak:
White
Hardness (Mohs):
5 - 5½
Tenacity:
Brittle
Cleavage:
Perfect
on {110}
Parting:
on {010}
Fracture:
Irregular/Uneven
Density:
2.2 - 2.26 g/cm3 (Measured)    2.25 g/cm3 (Calculated)

Crystallography of Natrolite

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Fdd2
Cell Parameters:
a = 18.2930(2) Å, b = 18.6430(5) Å, c = 6.5860(5) Å
Ratio:
a:b:c = 0.981 : 1 : 0.353
Unit Cell Volume:
V 2,246.07 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Crystals short to long prismatic, up to 1 m in length.
Twinning:
On {110}, {011}, {031}
Comment:
Data for chemically pure natrolite.

Crystallographic forms of Natrolite

Crystal Atlas:
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Natrolite no.7 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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

Optical Data of Natrolite

Type:
Biaxial (+)
RI values:
nα = 1.473 - 1.483 nβ = 1.476 - 1.486 nγ = 1.485 - 1.496
2V:
Measured: 58° to 64°, Calculated: 48° to 62°
Max Birefringence:
δ = 0.012 - 0.013
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v weak

Chemical Properties of Natrolite

Formula:
Na2Al2Si3O10 · 2H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Ca,K

Relationship of Natrolite to other Species

Member of:
Other Members of Group:
AlflarseniteNaCa2Be3Si4O13(OH) · 2H2O
AmiciteK2Na2Al4Si4O16 · 5H2O
Ammonioleucite(NH4,K)(AlSi2O6)
AnalcimeNa2(Al2Si4O12) · 2H2O
Barrerite(Na,K,Ca0.5)2[Al2Si7O18] · 7H2O
Beaumontite (of Lévy)
Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O
BikitaiteLiAlSi2O6 · H2O
BoggsiteCa8Na3(Si,Al)96O192 · 70H2O
Brewsterite
Brewsterite-Ba(Ba,Sr)[Al2Si6O16] · 5H2O
Brewsterite-Sr(Sr,Ba,Ca)[Al2Si6O16] · 5H2O
Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Chabazite-K(K2,Ca,Na2,Sr,Mg)2[Al2Si4O12]2 · 12H2O
Chabazite-Levyne Subgroup
Chabazite-Mg(Mg0.7K0.5Ca0.5Na0.1)[Al3Si9O24]·10H2O
Chabazite-Na(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
Chabazite-SrSr2[Al2Si4O12]2 · 12H2O
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
Clinoptilolite-Ca(Ca,Na,K)2-3Al3(Al,Si)2Si13O36 · 12H2O
Clinoptilolite-K(K,Na,Ca)2-3Al3(Al,Si)2Si13O36 · 12H2O
Clinoptilolite-Na(Na,K,Ca)2-3Al3(Al,Si)2Si13O36 · 12H2O
CowlesiteCaAl2Si3O10 · 6H2O
Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2O
Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2O
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2O
EdingtoniteBa[Al2Si3O10] · 4H2O
EpistilbiteCaAl2Si6O16 · 5H2O
Erionite-Ca(Ca,K2,Na2)2[Al4Si14O36] · 15H2O
Erionite-K(K2,Ca,Na2)2[Al4Si14O36] · 15H2O
Erionite-Na(Na2,K2,Ca)2[Al4Si14O36] · 15H2O
Faujasite Subgroup
Faujasite-Ca(Ca,Na2,Mg)3.5[Al7Si17O48] · 32H2O
Faujasite-Mg(Mg,Na2,Ca)3.5[Al7Si17O48] · 32H2O
Faujasite-Na(Na2,Ca,Mg)3.5[Al7Si17O48] · 32H2O
Ferrierite
Ferrierite-K(K2,Na2,Mg,Ca)3-5Mg[Al5-7Si27.5-31O72] · 18H2O
Ferrierite-Mg(Mg,Na2,K2,Ca)3-5Mg[Al5-7Si27.5-31O72] · 18H2O
Ferrierite-Na(Na2,K2,Mg,Ca)3-5Mg[Al5-7Si27.5-31O72] · 18H2O
FerrochiavenniteCa1-2Fe[(Si,Al,Be)5Be2O13(OH)2]•2H2O
Flörkeite(K3Ca2Na)[Al8Si8O32] · 12H2O
GarroniteNa2Ca5Al12Si20O64 · 27H2O
GaultiteNa4Zn2Si7O18 · 5H2O
Gismondine
Gismondine-BaBa2Al4Si4O16 · 4-6H2O
Gismondine-CaCaAl2Si2O8 · 4H2O
Gmelinite
Gmelinite-Ca(Ca,Na2)[Al2Si4O12] · 6H2O
Gmelinite-K(K2,Na2,Ca)[Al2Si4O12] · 6H2O
Gmelinite-Na(Na2,Ca)[Al2Si4O12] · 6H2O
GobbinsiteNa4(Ca,Mg,K2)Al6Si10O32 · 12H2O
Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
GoosecreekiteCa[Al2Si6O16] · 5H2O
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2O
Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
Heulandite-Ba(Ba,Ca,K,Na,Sr)5Al9Si27O72 · 22H2O
Heulandite-Ca(Ca,Na)2-3Al3(Al,Si)2Si13O36 · 12H2O
Heulandite-K(K,Na,Ca)2-3Al3(Al,Si)2Si13O36 · 12H2O
Heulandite-Na(Na,Ca)2-3Al3(Al,Si)2Si13O36 · 12H2O
Heulandite-Sr(Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36 · 12H2O
HsianghualiteCa3Li2(Be3Si3O12)F2
KirchhoffiteCs(BSi2O6)
LaumontiteCaAl2Si4O12 · 4H2O
LeuciteK(AlSi2O6)
Lévyne
Lévyne-Ca(Ca,Na2,K2)[Al2Si4O12] · 6H2O
Lévyne-Na(Na2,Ca,K2)[Al2Si4O12] · 6H2O
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
MesoliteNa2Ca2Si9Al6O30 · 8H2O
Montesommaite(K,Na)9Al9Si23O64 · 10H2O
Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2O
MutinaiteNa3Ca4Si85Al11O192 · 60H2O
NabesiteNa2BeSi4O10 · 4H2O
Natrolite Subgroup
OffretiteKCaMgAl5Si13O36 · 16H2O or near
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
ParanatroliteNa2Al2Si3O10 · 3H2O
ParthéiteCaAl2Si2O8 · 2H2O
Paulingite
Paulingite-Ca(Ca,K2,Na2,Ba)5[Al10Si35O90] · 45H2O
Paulingite-K(K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2O
Paulingite-Na(Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2O
PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O
Phillipsite-Ca(Ca0.5,K,Na,Ba0.5)4-7[Al4-7Si12-9O32 . 12H2O
Phillipsite-K(K,Na,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O
Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O
ScoleciteCaAl2Si3O10 · 3H2O
StelleriteCa4(Si28Al8)O72 · 28H2O
Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Stilbite-Na(Na,Ca,K)6-7[Al8Si28O72] · nH2O
StrontiohurlbutiteSrBe2(PO4)2
Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2O
Tetranatrolite
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.GA.05Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
9.GA.05MesoliteNa2Ca2Si9Al6O30 · 8H2O
9.GA.05ParanatroliteNa2Al2Si3O10 · 3H2O
9.GA.05ScoleciteCaAl2Si3O10 · 3H2O
9.GA.10Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
9.GA.10Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2O
9.GA.15EdingtoniteBa[Al2Si3O10] · 4H2O
9.GA.15KalborsiteK6Al4BSi6O20(OH)4Cl
16.2.1AlbiteNaAlSi3O8
16.2.2AnalcimeNa2(Al2Si4O12) · 2H2O
16.2.3UssingiteNa2AlSi3O8OH
16.2.4ParagoniteNaAl2(AlSi3O10)(OH)2
16.2.6Tetranatrolite
16.2.7ParanatroliteNa2Al2Si3O10 · 3H2O
16.2.8EphesiteLiNaAl2(Al2Si2O10)(OH)2
16.2.9Rectorite(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
16.2.10JadeiteNa(Al,Fe3+)Si2O6
16.2.11Brammallite(Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2
77.1.5.5ScoleciteCaAl2Si3O10 · 3H2O

Other Names for Natrolite

Other Information

Commonly orange to yellow
Electrical:
Pyroelectric, piezeoelectric
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 Natrolite

Reference List:
Klaproth, M.H. (1810): Chemische Untersuchung des Natroliths, Beiträge zur chemischen Kenntniss der Mineralkörper, Fünfter Band, Rottmann Berlin, 44-49

Murdoch, Joseph (1942): Crystallographic notes, cristobalite, stephanite, natrolite. American Mineralogist 27: 500-506.

Meier, W.M. (1960) The crystal structure of natrolite. Zeitschrift für Kristallographie: 113: 430-444.

Foster, M.D. (1965): Composition of the zeolites of the natrolite group: USGS PP 504D: 1-7.

Pabst, Adolf (1971) Natrolite from the Green River formation, Colorado, showing an intergrowth akin to twinning. American Mineralogist: 56: 560-569.

Neues Jahrbuch für Mineralogie, Abhandlungen (1982): 143: 231-248.

Baur, W.H., Kassner, D., Kim, C.-H., and Sieber, N.H. (1990): Flexibility and distortion of the framework of natrolite: crystal structures of ion-exchanged natrolites. European Journal of Mineralogy: 2: 761-769.

American Mineralogist (1992): 77: 685.

European Journal of Mineralogy: 7: 501-508.

Lee, Y., T. Vogt, J.A. Hriljac, J.B. Parise, & G. Artioli (2002): Pressure-induced volume expansion of zeolites in the natrolite family: Journal of the American Chemical Society: 124: 5466-5475.

Kol’tsova, T. N. (2005): Zeolites of the natrolite-thomsonite series. Inorganic Materials, 41, 750-756.

Yongjae Lee, Yongmoon Lee, and Donghoon Seoung (2010): Natrolite may not be a “soda-stone” anymore: Structural study of fully K-, Rb-, and Cs-exchanged natrolite. American Mineralogist, 95, 1636-1641.

Internet Links for Natrolite

Specimens:
The following Natrolite specimens are currently listed for sale on minfind.com.

Localities for Natrolite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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