Natrolemoynite Mineral Data

Natrolemoynite Mineral Data

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General Natrolemoynite Information

Chemical Formula:

Na4Zr2Si10O26·9(H2O)

Composition:

Molecular Weight = 1,128.53 gm

Potassium 1.04 % K 1.25 % K₂O

Sodium 5.50 % Na 7.41 % Na₂O

Calcium 0.36 % Ca 0.50 % CaO

Zirconium 16.17 % Zr 21.84 % ZrO₂

Niobium 0.82 % Nb 1.18 % Nb₂O₅

Silicon 24.89 % Si 53.24 % SiO₂

Hydrogen 1.61 % H 14.37 % H₂O

Oxygen 49.62 % O

______ ______

100.00 % 99.79 % = TOTAL OXIDE

Empirical Formula:

Na_2.7K_0.3Ca_0.1Zr₂Nb_0.1Si₁₀O₂₆·9(H₂O)

Environment:

Unaltered pegmatites that cut nepheline syenites.

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

The name alludes to the Na dominance and polymorphic relationship to lemoynite.

Synonym:

IMA1996-063

Natrolemoynite Image

Images:

Natrolemoynite

Comments: Radiating spray of tan natrolemoynite crystals, with brown coating, with white albite.
Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natrolemoynite Crystallography

Axial Ratios:

a:b:c =0.6469:1:0.56

Cell Dimensions:

a = 10.515, b = 16.2534, c = 9.1029, Z = 2; beta = 105° V = 1,502.72 Den(Calc)= 2.49

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.135(1)(020), 5.975(0.4)(021), 3.564(0.4)(221),3.49(0.35)(222), 3.974(0.35)(201),

Crystal Structure:

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McDonald A M , Chao G Y , The Canadian Mineralogist , 39 (2001) p.1295-1306, Natrolemoynite, a new hydrated sodiium zirconosilicate from Mont Saint-Hilaire,, Quebec: Description and structure determination, Locality: Mont Saint-Hilaire, Quebec, Canada

Physical Properties of Natrolemoynite

Cleavage:

[100] Perfect, [010] Perfect, [001] Poor

Color:

Colorless, White.

Density:

2.47

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Natrolemoynite

Gladstone-Dale:

CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2221,KPDmeas= 0.2239,KC= 0.2264

Optical Data:

Biaxial (-), a=1.533, b=1.559, g=1.567, bire=0.0340, 2V(Calc)=56, 2V(Meas)=63. Dispersion weak.

Calculated Properties of Natrolemoynite

Electron Density:

r_electron=2.45 gm/cc
note: r_{Natrolemoynite}=2.47 gm/cc.

Fermion Index

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Natrolemoynite}= 23.38 barns/electron
U=PE_{Natrolemoynite} x r_electron= 57.25 barns/cc.

Radioactivity:

GRapi = 14.87 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Natrolemoynite - barely detectable

Natrolemoynite Classification

Dana Class:

74.3.3.3 (74)Phyllosilicate Modulated Layers

(74.3)with joined strips

(74.3.3)Altisite/lemoynite

74.3.3.1 Altisite Na3K6Ti2Al2Si8O26Cl3 C 2/m 2/m

74.3.3.2 Lemoynite (Na,K)2CaZr2Si10O26·5-6(H2O) C 2/m 2/m

74.3.3.3 Natrolemoynite ! Na4Zr2Si10O26·9(H2O) C 2/m 2/m

Strunz Class:

VIII/G.09-08 VIII - Silicates

VIII/G - Intermediate between chain- and layered silicates

VIII/G.09 - Lemoynite - Loudounite series

VIII/G.09-05 Altisite Na3K6Ti2Al2Si8O26Cl3 C 2/m 2/m

VIII/G.09-08 Natrolemoynite Na4Zr2Si10O26·9(H2O) C 2/m 2/m

VIII/G.09-10 Lemoynite (Na,K)2CaZr2Si10O26·5-6(H2O) C 2/m 2/m

VIII/G.09-20 Loudounite NaCa5Zr4Si16O40(OH)11·8(H2O) Mono

Other Natrolemoynite Information

References:

NAME( AmMin, vol 87, p 997) PHYS. PROP.(AmMin, vol 87, p 997) OPTIC PROP.(AmMin, vol 87, p 997)

See Also:

Links to other databases for Natrolemoynite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Natrolemoynite

Na4Zr2Si10O26·9(H2O)
Dana No: 74.3.3.3 Strunz No: VIII/G.09-08
Locality:

Notes: