Lemoynite Mineral Data

Lemoynite Mineral Data +

General Lemoynite Information

Chemical Formula:

(Na,K)2CaZr2Si10O26·5-6(H2O)

Composition:

Molecular Weight = 1,075.15 gm

Potassium 3.27 % K 3.94 % K₂O

Sodium 2.35 % Na 3.17 % Na₂O

Calcium 3.35 % Ca 4.69 % CaO

Zirconium 15.27 % Zr 20.63 % ZrO₂

Niobium 0.86 % Nb 1.24 % Nb₂O₅

Iron 0.52 % Fe 0.67 % FeO

Silicon 26.12 % Si 55.88 % SiO₂

Hydrogen 1.07 % H 9.55 % H₂O

Oxygen 47.17 % O

______ ______

100.00 % 99.78 % = TOTAL OXIDE

Empirical Formula:

Na_1.1K_0.9Ca_0.9Fe²⁺_0.1Zr_1.8Nb_0.1Si₁₀O₂₆·5.7(H₂O)

Environment:

In pegmatite in an intrusive alkalic gabbro-syenite complex.

IMA Status:

Approved IMA 1969

Locality:

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

Name Origin:

Named for Charles Lemoyne (1625-1685), Lord of Longuevil, and his four sons, well-known personalites in French-Canadian history.

Synonym:

ICSD 60676

IMA1968-013

PDF 24-1072

Lemoynite Image

Images:

Lemoynite

Comments: Yellowish white, radial, spherical spray of prismatic Lemoynite crystals to 5mm in diameter on matrix.
Location: Mont St. Hilaire, Quebec, Canada. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Lemoynite Crystallography

Axial Ratios:

a:b:c =0.6488:1:1.1664

Cell Dimensions:

a = 10.348, b = 15.947, c = 18.601, Z = 4; beta = 104.59° V = 2,970.55 Den(Calc)= 2.40

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): 8.01(1), 3.562(0.49), 2.807(0.48),

Crystal Structure:

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Le Page Y , Perrault G , The Canadian Mineralogist , 14 (1976) p.132-138, Structure cristalline de la lemoynite, (Na,K)2CaZr2Si10O26,5-6H2O, Note: x-coordinate of Na1 changed.

Physical Properties of Lemoynite

Cleavage:

[001] Perfect, [010] Perfect, [001] Imperfect

Color:

Yellowish white, Light blue.

Density:

2.29

Diaphaniety:

Transparent to Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

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

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Lemoynite

Gladstone-Dale:

CI meas= -0.098 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.048 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.231,KPDmeas= 0.2421,KC= 0.2204

Optical Data:

Biaxial (+), a=1.54, b=1.553, g=1.57, bire=0.0300, 2V(Calc)=84, 2V(Meas)=80.

Calculated Properties of Lemoynite

Electron Density:

r_electron=2.37 gm/cc
note: r_Lemoynite=2.40 gm/cc.

Fermion Index

Fermion Index = 0.02972
Boson Index = 0.97028

Photoelectric:

PE_Lemoynite= 23.09 barns/electron
U=PE_Lemoynite x r_electron= 54.73 barns/cc.

Radioactivity:

GRapi = 46.65 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Lemoynite - barely detectable

Lemoynite Classification

Dana Class:

74.3.3.2 (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.09-10 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 Lemoynite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Lemoynite Specimen Label here :

Lemoynite

(Na,K)2CaZr2Si10O26·5-6(H2O)
Dana No: 74.3.3.2 Strunz No: VIII/G.09-10
Locality:

Notes: