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Na2Al2Si3O10 · 2H2O
White, Colorless, Red, Yellow, Brown, Green, bluish
Vitreous, Pearly
5 - 5½
Specific Gravity:
2.2 - 2.26
Crystal System:
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:
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Classification of NatroliteHide

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

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

1 : Zeolite group - True zeolites

16 : Silicates Containing Aluminum and other Metals
2 : Aluminosilicates of Na

Physical Properties of NatroliteHide

Vitreous, Pearly
Transparent, Translucent
White, Colorless, Red, Yellow, Brown, Green, bluish
5 - 5½ on Mohs scale
on {110}
on {010}
2.2 - 2.26 g/cm3 (Measured)    2.25 g/cm3 (Calculated)

Optical Data of NatroliteHide

Biaxial (+)
RI values:
nα = 1.473 - 1.483 nβ = 1.476 - 1.486 nγ = 1.485 - 1.496
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:
r < v weak

Chemical Properties of NatroliteHide

Na2Al2Si3O10 · 2H2O
IMA Formula:
Na2(Si3Al2)O10 · 2H2O
Common Impurities:

Crystallography of NatroliteHide

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

Crystallographic forms of NatroliteHide

Crystal Atlas:
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Natrolite no.7 - 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 NatroliteHide

Synonyms of NatroliteHide

Other Language Names for NatroliteHide

Varieties of NatroliteHide

FargiteA red calcian natrolite. [Clark, 1993 - "Hey's Mineral Index"] (TL) Glen Farg, Perthshire, Scotland
"Fargite" [Clark, 1993 - "Hey's Mineral Index"]
GalactiteA calcian variety of natrolite.
Originally reported from Glenfarg, Tayside (Perthshire), Scotland, UK.

Some galactites later turned out to be ferrierite (e.g., Zirkl, 1973).
Germanate-natroliteAn artificial Natrolite with Ge in place of Si
KondrikoviteNatrolite with inclusions of rinkite-like mineral, alteration product of Lovchorrite.
Originally described from Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.
MoorabooliteA variety of natrolite with a higher K-content than the latter; described by Pritchard, (1901), described as impure natrolite by Spencer (1903).
Originally reported from Moorabool River, Maude, Victoria, Australia.
SpreusteinA fine-grained natrolite replacing a hydrothermally altered sodalite and/or nepheline. Not uncommon in some nepheline-syenite pegmatites.

Compare also hydronephelite.

Relationship of Natrolite to other SpeciesHide

Other Members of this group:
Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2OOrth.
MesoliteNa2Ca2Si9Al6O30 · 8H2OOrth. mm2 : Fdd2
ParanatroliteNa2Al2Si3O10 · 3H2OMon. m : Bb
ScoleciteCaAl2Si3O10 · 3H2OMon. m : Bb

Common AssociatesHide

Associated Minerals Based on Photo Data:
Analcime458 photos of Natrolite associated with Analcime on
Benitoite256 photos of Natrolite associated with Benitoite on
Calcite246 photos of Natrolite associated with Calcite on
Neptunite230 photos of Natrolite associated with Neptunite on
Aegirine153 photos of Natrolite associated with Aegirine on
Thomsonite-Ca91 photos of Natrolite associated with Thomsonite-Ca on
Prehnite78 photos of Natrolite associated with Prehnite on
Fluorapophyllite-(K)74 photos of Natrolite associated with Fluorapophyllite-(K) on
Rhodochrosite72 photos of Natrolite associated with Rhodochrosite on
Joaquinite-(Ce)72 photos of Natrolite associated with Joaquinite-(Ce) on

Related Minerals - Nickel-Strunz GroupingHide

9.GA.05Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2OOrth.
9.GA.05MesoliteNa2Ca2Si9Al6O30 · 8H2OOrth. mm2 : Fdd2
9.GA.05ParanatroliteNa2Al2Si3O10 · 3H2OMon. m : Bb
9.GA.05ScoleciteCaAl2Si3O10 · 3H2OMon. m : Bb
9.GA.10Thomsonite-CaNaCa2[Al5Si5O20] · 6H2OOrth. mmm (2/m 2/m 2/m)
9.GA.10Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2OOrth. mmm (2/m 2/m 2/m)
9.GA.15EdingtoniteBa[Al2Si3O10] · 4H2O

Related Minerals - Dana Grouping (8th Ed.)Hide · 3H2OMon. m : Bb · 8H2OOrth. mm2 : Fdd2 · 3H2OMon. m : Bb[Al2Si3O10] · 4H2O,Ca)2(Si,Al)5O10 · 3H2OOrth. · 6H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.2.1AlbiteNa(AlSi3O8)Tric. 1
16.2.2AnalcimeNa(AlSi2O6) · H2OTric.
16.2.3UssingiteNa2AlSi3O8OHTric. 1 : P1
16.2.7ParanatroliteNa2Al2Si3O10 · 3H2OMon. m : Bb
16.2.9Rectorite(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2OMon.

Fluorescence of NatroliteHide

Commonly orange to yellow

Other InformationHide

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 NatroliteHide

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

Localities for NatroliteHide

This 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.

Locality ListShow

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