Mineralogy Database

Lalondeite Mineral Data

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General Lalondeite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca)6(Ca,Na)3Si16O38(F,OH)2•3(H2O)
Help on Composition: Composition: Molecular Weight = 1,441.00 gm
   Potassium   0.60 %  K     0.72 % K2O
   Sodium      8.50 %  Na   11.46 % Na2O
   Calcium    10.87 %  Ca   15.22 % CaO
   Silicon    31.50 %  Si   67.38 % SiO2
   Hydrogen    0.49 %  H     4.34 % H2O
   Chlorine    0.17 %  Cl    0.17 % Cl
                -   %   Cl   -0.04 % -O=Cl2   
   Oxygen     46.57 %  O
   Fluorine    1.31 %  F     1.31 % F
                -   %   F    -0.55 % -O=F2    
             ______        ______ 
             100.00 %      100.01 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na5.33Ca0.91K0.22Ca3Si16.16O38F0.99(OH)0.94Cl0.07�3(H2O)
Help on Environment: Environment: Discovered on a single, handsized sample of altered breccia (or possibly, altered marble) collected in the summer of 1985. Reyerite group; structure determined.
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Andre Edmond Lalonde (b. 1955), Professor of Geology at the University of Ottawa, Ottawa, Ontario, Canada.
Help on Synonym: Synonym: IMA2002-026

Lalondeite Image

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Comments: Vein of pinkish lalondeite with a greenish clinoamphibole in altered breccia.
Location: Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Scale: Picture size 3 cm.
© Canadian Mineralogist

Lalondeite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9975:1:1.2602
Help on Cell Dimensions: Cell Dimensions: a = 9.589, b = 9.613, c = 12.115, Z = 1; alpha = 96.62°, beta = 92.95°, gamma = 119.81° V = 961.24 Den(Calc)= 2.49
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.888(1)(123), 11.938(0.9)(001), 2.967(0.5)(122),3.972(0.4)(003), 2.981(0.35)(213), 4.106(0.3)(020), 4.142(0.3)(220),

Physical Properties of Lalondeite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Pink.
Help on Density: Density: 2.5
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Splintery - Brittle fracture leaving splintery fragments.
Help on Habit: Habit: Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.
Help on Habit: Habit: Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Fluorescent, Short UV=violet-blue, Long UV=none.
Help on Luster: Luster: Pearly
Help on Streak: Streak: white

Optical Properties of Lalondeite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2097,KPDmeas= 0.2105,KC= 0.2112
Ncalc = 1.53
Help on Optical Data: Optical Data: Biaxial (-), a=1.522, b=1.528, g=1.529, bire=0.0070, 2V(Calc)=44, 2V(Meas)=48. Dispersion dispersion not observed.

Calculated Properties of Lalondeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Lalondeite =2.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PELalondeite = 2.76 barns/electron
U=PELalondeite x relectron= 6.90 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 8.61 (Gamma Ray American Petroleum Institute Units)
Concentration of Lalondeite per GRapi unit = 11.61 (%)

Estimated Radioactivity from Lalondeite - barely detectable


Lalondeite Classification

Help on  Dana Class: Dana Class: 73.02.02d.02 (73)Phyllosilicate Condensed Tetrahedral Sheets
  (73.02)with double and single layers
  (73.02.02d)Reyerite group (Triclinic Subgroup)
73.02.02d.01 Martinite! (Na,[],Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2•4(H2O) P1 1
73.02.02d.02 Lalondeite! (Na,Ca)6(Ca,Na)3Si16O38(F,OH)2•3(H2O) P1 1
Help on  Strunz Class: Strunz Class: 09.EE.85 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
09.EE.85 Lalondeite! (Na,Ca)6(Ca,Na)3Si16O38(F,OH)2•3(H2O) P1 1

Other Lalondeite Information

Help on References: References: NAME( CanMin v43:181) PHYS. PROP.(CanMin v43:181) OPTIC PROP.(CanMin v43:181)
Help on See Also: See Also: Links to other databases for Lalondeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: 73.02.02d.02 Strunz No: 09.EE.85





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