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Natrolemoynite

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Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville Co., Québec, Canada
© 2005 DM

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Formula:
Na
 
4
Zr
 
2
Si
 
10
O
 
26
•
 
9
H
 
2
O
System:MonoclinicColour:Colorless to white
Lustre:Sub-Adamantine, VitreousHardness:3
This page provides mineralogical data about Natrolemoynite.

Classification of Natrolemoynite

IMA status:Approved 1996
Nickel-Strunz 10th (pending) edition ID:9.DP.35

9 : SILICATES (Germanates)
D : Inosilicates
P : Transitional ino-phyllosilicate structures
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Type Occurrence of Natrolemoynite

Type Locality:Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville Co., Québec, Canada
Geological Setting of type material:In pegmatites cutting nepheline syenite.
Associated Minerals at type locality:
ZirconSphaleritePyrochlorePyriteMicrocline
MicroclineMagnetiteLepidocrociteGalenaChlorite Group
CalciteBiotiteAlbite

Physical Properties of Natrolemoynite

Lustre:Sub-Adamantine, Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colorless to white
Streak:White
Hardness (Mohs):3
Tenacity:Brittle
Cleavage:Perfect
{100} and {010} perfect
{001} poor
Fracture:Irregular/Uneven
Density (measured):2.47 g/cm3
Density (calculated):2.5 g/cm3

Crystallography of Natrolemoynite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m (B1 1 2/m) [C2/m] {C1 2/m 1}
Cell Parameters:a = 10.515Å, b = 16.2534Å, c = 9.1029Å
β = 105.462°
Ratio:a:b:c = 0.647 : 1 : 0.56
Unit Cell Volume:V 1499.4 ų
Z:2
Morphology:{100} {010} and {001} dominant, also minor pinacoid-like forms
Twinning:None mentioned
X-Ray Powder Diffraction:
d-spacingIntensity
8.832 (30)
8.132 (100)
5.975 (40)
3.974 (35)
3.693 (30)
3.564 (40)
3.490 (35)

Optical Data of Natrolemoynite

Type:Biaxial (-)
RI values: nα = 1.533 nβ = 1.559 nγ = 1.567
2V:Measured: 63° , Calculated: 57°
Maximum Birefringence:δ = 0.034

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:crossed axial plain, weak
Pleochroism:Non-pleochroic

Chemical Properties of Natrolemoynite

Formula:
Na
 
4
Zr
 
2
Si
 
10
O
 
26
•
 
9
H
 
2
O
Essential elements:H, Na, O, Si, Zr
All elements listed in formula:H, Na, O, Si, Zr
Analyical Data:Means of nineteen sets of electron microprobe data (with H2O calculated to give 9H2O). Nb appears to be missing from these results when compared with empirical formula.
Na2O (7.47%)
K2O (1.29%)
CaO (0.37%)
MnO (0.12%)
Al2O3 (0.04%)
SiO2 (54.51%)
TiO2 (0.38%)
ZrO2 (21.97%)
H2O (14.72)

Total: 101.88 wt.%
Empirical Formula:
(Na
 
2.67
K
 
0.30
Ca
 
0.07
Mn
 
0.02
)
 
Σ3.06
(Zr
 
1.97
Nb
 
0.08
Ti
 
0.05
)
 
Σ2.10
(Si
 
10.05
Al
 
0.01
)
 
Σ10.06
O
 
25.96
·9.04H
 
2
O

Relationship of Natrolemoynite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.DP.05Meliphanite
(Ca,Na)
 
2
(Be,Al)[Si
 
2
O
 
6
(OH,F)]
9.DP.15Leucosphenite
BaNa
 
4
Ti
 
2
B
 
2
Si
 
10
O
 
30
9.DP.20Prehnite
Ca
 
2
Al
 
2
Si
 
3
O
 
12
(OH)
9.DP.25Amstallite
CaAl(Si,Al)
 
4
O
 
8
(OH)
 
4
·(H
 
2
O,Cl)
9.DP.30Kvanefjeldite
Na
 
4
(Ca,Mn)(Si
 
3
O
 
7
)
 
2
(OH)
 
2
9.DP.35Lemoynite
(Na,K)
 
2
CaZr
 
2
Si
 
10
O
 
26
·5H
 
2
O
9.DP.40Altisite
Na
 
3
K
 
6
Ti
 
2
Al
 
2
Si
 
8
O
 
26
Cl
 
3

Other Names for Natrolemoynite

Synonyms:
IMA1996-063
German names:
Natrolemoynit
Russian names:
Натролемуанит
Spanish names:
Natrolemoynita

Other Information

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 Natrolemoynite

Reference List:Canadian Mineralogist (2001): 39, 1295-1306.

Internet Links for Natrolemoynite

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    Localities for Natrolemoynite

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    Canada
     
    • Québec
      • Rouville Co.
        • Mont Saint-Hilaire
    		Can. Min. 39:1295-1306
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