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Natrolite

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Formula:
Na
 
2
Al
 
2
Si
 
3
O
 
10
· 2H
 
2
O
System:OrthorhombicColour:White, Colorless, Red, ...
Hardness:5 - 5½
Member of:Zeolite Group
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:Gonnardite


Zeolite Group, Natrolite subgroup.

Visit gemdat.org for gemological information about Natrolite. Currently in public beta-test.

Classification of Natrolite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/J.21-10
Nickel-Strunz 10th (pending) edition ID:9.GA.05

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
A : Zeolites with T5O10 Units – The Fibrous Zeolites
Dana 7th edition ID:77.1.5.1
Dana 8th edition ID:77.1.5.1

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
Hey's CIM Ref.:16.2.5

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

Type Locality:Hohentwiel, Singen, Hegau, Baden-Württemberg, Germany
Year of Discovery:1803

Occurrences of Natrolite

Geological Setting:Cavities in amygdaloidal basalts

Physical Properties of Natrolite

Lustre: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 (measured):2.2 - 2.26 g/cm3
Density (calculated):2.25 g/cm3

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.
Crystal Atlas:
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Natrolite no.7 - Goldschmidt (1913-1926)

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are 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:
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Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
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°
Maximum Birefringence:δ = 0.012 - 0.013

Chart 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:
Na
 
2
Al
 
2
Si
 
3
O
 
10
· 2H
 
2
O
Simplified for copy/paste:Na2Al2Si3O10·2H2O
Essential elements:Al, H, Na, O, Si
All elements listed in formula:Al, H, Na, O, Si
Common Impurities:Ca,K

Relationship of Natrolite to other Species

Member of:Zeolite Group
Other Members of Group:

- +
Alflarsenite
NaCa
 
2
Be
 
3
Si
 
4
O
 
13
(OH) · 2H
 
2
O
Amicite
K
 
2
Na
 
2
Al
 
4
Si
 
4
O
 
16
· 5H
 
2
O
Ammonioleucite
(NH
 
4
,K)(AlSi
 
2
O
 
6
)
Analcime
Na
 
2
(Al
 
2
Si
 
4
O
 
12
) · 2H
 
2
O
Barrerite
(Na,K,Ca
 
0.5
)
 
2
[Al
 
2
Si
 
7
O
 
18
] · 7H
 
2
O
Beaumontite (of Lévy)
Bellbergite
(K,Ba,Sr)
 
2
Sr
 
2
Ca
 
2
(Ca,Na)
 
4
[Al
 
3
Si
 
3
O
 
12
]
 
6
· 30H
 
2
O
Bikitaite
LiAlSi
 
2
O
 
6
· H
 
2
O
Boggsite
Ca
 
8
Na
 
3
(Si,Al)
 
96
O
 
192
· 70H
 
2
O
Brewsterite
Brewsterite-Ba
(Ba,Sr)[Al
 
2
Si
 
6
O
 
16
] · 5H
 
2
O
Brewsterite-Sr
(Sr,Ba,Ca)[Al
 
2
Si
 
6
O
 
16
] · 5H
 
2
O
Chabazite-Ca
(Ca,K
 
2
,Na
 
2
)
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
· 12H
 
2
O
Chabazite-K
(K
 
2
,Ca,Na
 
2
,Sr,Mg)
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
· 12H
 
2
O
Chabazite-Levyne Subgroup
Chabazite-Mg
(Mg
 
0.7
K
 
0.5
Ca
 
0.5
Na
 
0.1
)[Al
 
3
Si
 
9
O
 
24
]·10H
 
2
O
Chabazite-Na
(Na
 
2
,K
 
2
,Ca,Sr,Mg)
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
· 12H
 
2
O
Chabazite-Sr
Sr
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
· 12H
 
2
O
Chiavennite
CaMnBe
 
2
Si
 
5
O
 
13
(OH)
 
2
· 2H
 
2
O
Clinoptilolite-Ca
(Ca,Na,K)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Clinoptilolite-K
(K,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Clinoptilolite-Na
(Na,K,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Cowlesite
CaAl
 
2
Si
 
3
O
 
10
· 6H
 
2
O
Dachiardite-Ca
(Ca,Na
 
2
,K
 
2
)
 
5
Al
 
10
Si
 
38
O
 
96
· 25H
 
2
O
Dachiardite-Na
(Na
 
2
,Ca,K
 
2
)
 
5
Al
 
10
Si
 
38
O
 
96
· 25H
 
2
O
Direnzoite
NaK
 
6
MgCa
 
2
(Al
 
13
Si
 
47
O
 
120
) · 36H
 
2
O
Edingtonite
Ba[Al
 
2
Si
 
3
O
 
10
] · 4H
 
2
O
Epistilbite
CaAl
 
2
Si
 
6
O
 
16
· 5H
 
2
O
Erionite-Ca
(Ca,K
 
2
,Na
 
2
)
 
2
[Al
 
4
Si
 
14
O
 
36
] · 15H
 
2
O
Erionite-K
(K
 
2
,Ca,Na
 
2
)
 
2
[Al
 
4
Si
 
14
O
 
36
] · 15H
 
2
O
Erionite-Na
(Na
 
2
,K
 
2
,Ca)
 
2
[Al
 
4
Si
 
14
O
 
36
] · 15H
 
2
O
Faujasite Subgroup
Faujasite-Ca
(Ca,Na
 
2
,Mg)
 
3.5
[Al
 
7
Si
 
17
O
 
48
] · 32H
 
2
O
Faujasite-Mg
(Mg,Na
 
2
,Ca)
 
3.5
[Al
 
7
Si
 
17
O
 
48
] · 32H
 
2
O
Faujasite-Na
(Na
 
2
,Ca,Mg)
 
3.5
[Al
 
7
Si
 
17
O
 
48
] · 32H
 
2
O
Ferrierite
Ferrierite-K
(K
 
2
,Na
 
2
,Mg,Ca)
 
3-5
Mg[Al
 
5-7
Si
 
27.5-31
O
 
72
] · 18H
 
2
O
Ferrierite-Mg
(Mg,Na
 
2
,K
 
2
,Ca)
 
3-5
Mg[Al
 
5-7
Si
 
27.5-31
O
 
72
] · 18H
 
2
O
Ferrierite-Na
(Na
 
2
,K
 
2
,Mg,Ca)
 
3-5
Mg[Al
 
5-7
Si
 
27.5-31
O
 
72
] · 18H
 
2
O
Ferrochiavennite
Ca
 
1-2
Fe[(Si,Al,Be)
 
5
Be
 
2
O
 
13
(OH)
 
2
]•2H
 
2
O
Flörkeite
(K
 
3
Ca
 
2
Na)[Al
 
8
Si
 
8
O
 
32
] · 12H
 
2
O
Garronite
Na
 
2
Ca
 
5
Al
 
12
Si
 
20
O
 
64
· 27H
 
2
O
Gaultite
Na
 
4
Zn
 
2
Si
 
7
O
 
18
· 5H
 
2
O
Gismondine
Gismondine-Ba
Ba
 
2
Al
 
4
Si
 
4
O
 
16
· 4-6H
 
2
O
Gismondine-Ca
CaAl
 
2
Si
 
2
O
 
8
· 4H
 
2
O
Gmelinite
Gmelinite-Ca
(Ca,Na
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
Gmelinite-K
(K
 
2
,Na
 
2
,Ca)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
Gmelinite-Na
(Na
 
2
,Ca)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
Gobbinsite
Na
 
4
(Ca,Mg,K
 
2
)Al
 
6
Si
 
10
O
 
32
· 12H
 
2
O
Gonnardite
(Na,Ca)
 
2
(Si,Al)
 
5
O
 
10
· 3H
 
2
O
Goosecreekite
Ca[Al
 
2
Si
 
6
O
 
16
] · 5H
 
2
O
Gottardiite
Na
 
3
Mg
 
3
Ca
 
5
Al
 
19
Si
 
117
O
 
272
· 93H
 
2
O
Harmotome
(Ba
 
0.5
,Ca
 
0.5
,K,Na)
 
5
[Al
 
5
Si
 
11
O
 
32
] · 12H
 
2
O
Heulandite-Ba
(Ba,Ca,K,Na,Sr)
 
5
Al
 
9
Si
 
27
O
 
72
· 22H
 
2
O
Heulandite-Ca
(Ca,Na)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Heulandite-K
(K,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Heulandite-Na
(Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Heulandite-Sr
(Sr,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
· 12H
 
2
O
Hsianghualite
Ca
 
3
Li
 
2
(Be
 
3
Si
 
3
O
 
12
)F
 
2
Laumontite
CaAl
 
2
Si
 
4
O
 
12
· 4H
 
2
O
Leucite
K(AlSi
 
2
O
 
6
)
Lévyne
Lévyne-Ca
(Ca,Na
 
2
,K
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
Lévyne-Na
(Na
 
2
,Ca,K
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
Lovdarite
(Na,K,Ca)
 
4
(Be,Al)
 
2
Si
 
6
O
 
16
· 4H
 
2
O
Maricopaite
Pb
 
7
Ca
 
2
(Si,Al)
 
48
O
 
100
· 32H
 
2
O
Mazzite-Mg
K
 
2
Mg
 
2
Ca
 
1.5
Al
 
9.5
Si
 
26.5
O
 
72
· 28H
 
2
O or near
Mazzite-Na
Na
 
4
[Al
 
4
Si
 
14
O
 
36
]
 
2
· 30H
 
2
O
Merlinoite
(K,Na)
 
5
(Ca,Ba)
 
2
Al
 
9
Si
 
23
O
 
64
· 23H
 
2
O
Mesolite
Na
 
2
Ca
 
2
Si
 
9
Al
 
6
O
 
30
· 8H
 
2
O
Montesommaite
(K,Na)
 
9
Al
 
9
Si
 
23
O
 
64
· 10H
 
2
O
Mordenite
(Na
 
2
,Ca,K
 
2
)Al
 
2
Si
 
10
O
 
24
· 7H
 
2
O
Mutinaite
Na
 
3
Ca
 
4
Si
 
85
Al
 
11
O
 
192
· 60H
 
2
O
Nabesite
Na
 
2
BeSi
 
4
O
 
10
· 4H
 
2
O
Natrolite Subgroup
Offretite
KCaMgAl
 
5
Si
 
13
O
 
36
· 16H
 
2
O or near
Pahasapaite
Li
 
8
(Ca,Li,K)
 
10.5
Be
 
24
(PO
 
4
)
 
24
· 38H
 
2
O
Paranatrolite
Na
 
2
Al
 
2
Si
 
3
O
 
10
· 3H
 
2
O
Parthéite
CaAl
 
2
Si
 
2
O
 
8
· 2H
 
2
O
Paulingite
Paulingite-Ca
(Ca,K
 
2
,Na
 
2
,Ba)
 
5
[Al
 
10
Si
 
35
O
 
90
] · 45H
 
2
O
Paulingite-K
(K
 
2
,Ca,Na
 
2
,Ba)
 
5
[Al
 
10
Si
 
35
O
 
90
] · 45H
 
2
O
Paulingite-Na
(Na
 
2
,K
 
2
,Ca,Ba)
 
5
[Al
 
10
Si
 
35
O
 
90
] · 45H
 
2
O
Perlialite
K
 
9
Na(Ca,Sr)[Al
 
2
Si
 
4
O
 
12
]
 
6
· 15H
 
2
O
Phillipsite-Ca
(Ca
 
0.5
,K,Na,Ba
 
0.5
)
 
4-7
[Al
 
4-7
Si
 
12-9
O
 
32
.
 
12H2O
Phillipsite-K
(K,Na,Ca
 
0.5
,Ba
 
0.5
)
 
4-7
[Al
 
4-7
Si
 
12-9
O
 
32
]
.
 
12H
 
2
O
Phillipsite-Na
(Na,K,Ca
 
0.5
,Ba
 
0.5
)
 
4-7
[Al
 
4-7
Si
 
12-9
O
 
32
] · 12H
 
2
O
Pollucite
(Cs,Na)
 
2
(Al
 
2
Si
 
4
O
 
12
) · 2H
 
2
O
Roggianite
Ca
 
2
Be(OH)
 
2
Al
 
2
Si
 
4
O
 
13
· 2.5H
 
2
O
Scolecite
CaAl
 
2
Si
 
3
O
 
10
· 3H
 
2
O
Stellerite
Ca[Al
 
2
Si
 
7
O
 
18
] · 7H
 
2
O
Stilbite-Ca
NaCa
 
4
[Al
 
9
Si
 
27
O
 
72
] · nH
 
2
O
Stilbite-Na
(Na,Ca,K)
 
6-7
[Al
 
8
Si
 
28
O
 
72
] · nH
 
2
O
Strontiohurlbutite
SrBe
 
2
(PO
 
4
)
 
2
Terranovaite
(Na,Ca)
 
8
(Si
 
68
Al
 
12
)O
 
160
· 29H
 
2
O
Tetranatrolite
Thomsonite-Ca
NaCa
 
2
[Al
 
5
Si
 
5
O
 
20
] · 6H
 
2
O
Thomsonite-Sr
Na(Sr,Ca)
 
2
[Al
 
5
Si
 
5
O
 
20
] · 7H
 
2
O
Tschernichite
(Ca,Na
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 4-8H
 
2
O
Tschörtnerite
Ca
 
4
(Ca,Sr,K,Ba)
 
3
Cu
 
3
[(OH)
 
2
|Al
 
3
Si
 
3
O
 
12
]
 
4
· nH
 
2
O
Wairakite
Ca(Al
 
2
Si
 
4
O
 
12
) · 2H
 
2
O
Weinebeneite
CaBe
 
3
(PO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
Wenkite
(Ba,K)
 
4
(Ca,Na)
 
6
[(SO
 
4
)
 
3
|(Si,Al)
 
20
O
 
39
(OH)
 
2
] · 0.5H
 
2
O
Willhendersonite
KCa[Al
 
3
Si
 
3
O
 
12
] · 5H
 
2
O
Yugawaralite
CaAl
 
2
Si
 
6
O
 
16
· 4H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
9.GA.05Gonnardite
(Na,Ca)
 
2
(Si,Al)
 
5
O
 
10
· 3H
 
2
O
9.GA.05Mesolite
Na
 
2
Ca
 
2
Si
 
9
Al
 
6
O
 
30
· 8H
 
2
O
9.GA.05Paranatrolite
Na
 
2
Al
 
2
Si
 
3
O
 
10
· 3H
 
2
O
9.GA.05Scolecite
CaAl
 
2
Si
 
3
O
 
10
· 3H
 
2
O
9.GA.10Thomsonite-Ca
NaCa
 
2
[Al
 
5
Si
 
5
O
 
20
] · 6H
 
2
O
9.GA.10Thomsonite-Sr
Na(Sr,Ca)
 
2
[Al
 
5
Si
 
5
O
 
20
] · 7H
 
2
O
9.GA.15Edingtonite
Ba[Al
 
2
Si
 
3
O
 
10
] · 4H
 
2
O
9.GA.15Kalborsite
K
 
6
Al
 
4
BSi
 
6
O
 
20
(OH)
 
4
Cl
Related Minerals - Hey's Index Grouping:

- +
16.2.1Albite
NaAlSi
 
3
O
 
8
16.2.2Analcime
Na
 
2
(Al
 
2
Si
 
4
O
 
12
) · 2H
 
2
O
16.2.3Ussingite
Na
 
2
AlSi
 
3
O
 
8
OH
16.2.4Paragonite
NaAl
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
16.2.6Tetranatrolite
16.2.7Paranatrolite
Na
 
2
Al
 
2
Si
 
3
O
 
10
· 3H
 
2
O
16.2.8Ephesite
LiNaAl
 
2
(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
16.2.9Rectorite
(Na,Ca)Al
 
4
((Si,Al)
 
8
O
 
20
)(OH)
 
4
· 2H
 
2
O
16.2.10Jadeite
Na(Al,Fe
3+
 
)Si
 
2
O
 
6
16.2.11Brammallite
(Na,H
 
3
O)(Al,Mg,Fe)
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
Related Minerals - Dana Grouping):

- +
77.1.5.5Scolecite
CaAl
 
2
Si
 
3
O
 
10
· 3H
 
2
O

Other Names for Natrolite

Synonyms:
Ædelite (of Kirwan)ApoanalciteCockaliteCrocaliteEpinatrolite
LehuntiteNatronite (of ?)NeedlestonePortiteRadiolite
Other Languages:
Dutch:Natroliet
German:Natrolith
Apoanalcit
Brevicit
Cockalit
Crocalit
Epinatrolith
Höganit
Lehuntit
Hebrew:נתרוליט
Hungarian:Nátrolit
Italian:Natrolite
Norwegian (Bokmål):Radyolith
Polish:Natrolit
Russian:Натролит
Simplified Chinese:钠沸石
Spanish:Natrolita
Apoanalcita
Cockalita
Crocalita
Epinatrolita
Lehuntita
Ukrainian:Натроліт
Varieties:
BergmanniteFargiteGalactiteGermanate-natroliteKondrikovite
MoorabooliteSpreustein

Other Information

Fluorescence in UV light:Commonly orange to yellow
Electrical:Pyroelectric, piezeoelectric
Health Warning: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

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  • Look for Natrolite on Wikipedia
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Natrolite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Natrolite

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