Lalondeite Mineral Data

Lalondeite Mineral Data

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General Lalondeite Information

Chemical Formula:

(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2·3(H2O)

Composition:

Molecular Weight = 1,392.12 gm

Sodium 7.43 % Na 10.02 % Na₂O

Calcium 10.08 % Ca 14.10 % CaO

Silicon 32.28 % Si 69.06 % SiO₂

Hydrogen 0.47 % H 4.21 % H₂O

Oxygen 47.70 % O

Fluorine 2.05 % F 2.05 % F

- % F -0.86 % -O=F₂

______ ______

100.00 % 98.56 % = TOTAL OXIDE

Empirical Formula:

Na_4.5Ca_3.5Si₁₆O₃₈F_1.5(OH)_0.5·3(H₂O)

Environment:

Reyerite group; structure determined

IMA Status:

Proposed IMA 2002 (Dana # Added)

Locality:

Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals and Mineral Names (CNMMN)

Synonym:

IMA2002-026

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Lalondeite Crystallography

Axial Ratios:

a:b:c =0.7934:1:0.7914

Cell Dimensions:

a = 9.613, b = 12.115, c = 9.589, Z = 1.3333; alpha = 92.95°, beta = 119.81°, gamma = 96.62° V = 961.24 Den(Calc)= 3.21

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.888(1), 11.99(1), 5.97(0.85),1.82(0.5), 2.967(0.5), 3.97(0.4),

Physical Properties of Lalondeite

Color:

Colorless.

Luster:

Pearly

Optical Properties of Lalondeite

Gladstone-Dale:

CI calc= 0.21 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.164,KC= 0.2075

Optical Data:

Biaxial (-), a=1.522, b=1.528, g=1.529, bire=0.0070

Calculated Properties of Lalondeite

Electron Density:

r_electron=3.21 gm/cc
note: r_Lalondeite=3.21 gm/cc.

Fermion Index

Fermion Index = 0.01544
Boson Index = 0.98456

Photoelectric:

PE_Lalondeite= 2.62 barns/electron
U=PE_Lalondeite x r_electron= 8.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lalondeite is Not Radioactive

Lalondeite Classification

Dana Class:

73.2.2d.2 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.2)with double and single layers

(73.2.2d)Reyerite group (Triclinic Subgroup)

73.2.2d.1 Martinite! (Na,Ca)11Ca4(Si,S,B)14B2O40F2·4(H2O) P1 1

73.2.2d.2 Lalondeite ! (Na,Ca)6(Ca,Na)3Si16O38(F,OH)2·3(H2O) P1 1

Strunz Class:

VIII/HX.00-00 VIII - Silicates

VIII/HX - Unclassified Strunz Phyllosilicates

VIII/HX.00 - Reyerite Group

Other Lalondeite Information

See Also:

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

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

Lalondeite

(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2·3(H2O)
Dana No: 73.2.2d.2 Strunz No: VIII/HX.00-00
Locality:

Notes: