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Natrolite

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Formula:
Na2Al2Si3O10 · 2H2O
Colour:
White, Colorless, Red, Yellow, Brown, Green, bluish
Lustre:
Vitreous, Pearly
Hardness:
5 - 5½
Specific Gravity:
2.2 - 2.26
Crystal System:
Orthorhombic
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

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

Physical Properties of Natrolite

Vitreous, Pearly
Transparency:
Transparent, Translucent
Colour:
White, Colorless, Red, Yellow, Brown, Green, bluish
Streak:
White
Hardness:
5 - 5½ on Mohs scale
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)

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
IMA Formula:
Na2(Si3Al2)O10 · 2H2O
Common Impurities:
Ca,K

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

Toggle
Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

View
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.

Type Occurrence of Natrolite

Synonyms of Natrolite

Other Language Names for Natrolite

Varieties of Natrolite

Fargite

A red calcian natrolite. [Clark, 1993 - "Hey's Mineral Index"] (TL) Glen Farg, Perthshire, Scotland
"Fargite" [Clark, 1993 - "Hey's Mineral Index"]

Galactite

A 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-natrolite

An artificial Natrolite with Ge in place of Si

Kondrikovite

Natrolite with inclusions of rinkite-like mineral, alteration product of Lovchorrite.
Originally described from Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.

Mooraboolite

A 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.

Spreustein

A 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 Species

Other Members of this group:
Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
MesoliteNa2Ca2Si9Al6O30 · 8H2O
ParanatroliteNa2Al2Si3O10 · 3H2O
ScoleciteCaAl2Si3O10 · 3H2O

Common Associates

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

Related Minerals - Nickel-Strunz Grouping

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

Related Minerals - Hey's Chemical Index of Minerals Grouping

16.2.1AlbiteNa(AlSi3O8)
16.2.2AnalcimeNa(AlSi2O6) · H2O
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

Related Minerals - Dana Grouping (8th Ed.)

77.1.5.3ParanatroliteNa2Al2Si3O10 · 3H2O
77.1.5.4MesoliteNa2Ca2Si9Al6O30 · 8H2O
77.1.5.5ScoleciteCaAl2Si3O10 · 3H2O
77.1.5.6EdingtoniteBa[Al2Si3O10] · 4H2O
77.1.5.7Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
77.1.5.8CowlesiteCaAl2Si3O10 · 6H2O

Fluorescence of Natrolite

Commonly orange to yellow

Other Information

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:
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 Natrolite

mindat.org URL:
https://www.mindat.org/min-2947.html
Please feel free to link to this page.
Specimens:
The following Natrolite specimens are currently listed for sale on minfind.com.

Localities for Natrolite

Mineral and/or Locality  
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