Lalondeite Mineral Data

[Fine Minerals] [What's New] [Mineral Galleries] [My Collection] [Mineral Auctions]
Weinrich Minerals, Inc
Full-time professional mineral dealer with over 31 years experience in mineral collecting
And 15 years selling mineral specimens on the internet and at major mineral shows

General Lalondeite Information

Chemical Formula:

(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2•3(H2O)

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

Empirical Formula:

Na_5.33Ca_0.91K_0.22Ca₃Si_16.16O₃₈F_0.99(OH)_0.94Cl_0.07·3(H₂O)

Environment:

Discovered on a single, handsized sample of altered breccia (or possibly, altered marble) collected in the summer of 1985. Reyerite group; structure determined.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

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

Name Origin:

Named for Andre Edmond Lalonde (b. 1955), Professor of Geology at the University of Ottawa, Ottawa, Ontario, Canada.

Synonym:

IMA2002-026

Lalondeite Image

Images:

Lalondeite

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

Axial Ratios:

a:b:c =0.9975:1:1.2602

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

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)(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

Cleavage:

{001} Perfect

Color:

Pink.

Density:

2.5

Diaphaneity:

Transparent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Habit:

Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.

Hardness:

3 - Calcite

Luminescence:

Fluorescent, Short UV=violet-blue, Long UV=none.

Luster:

Pearly

Streak:

white

Optical Properties of Lalondeite

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

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

Electron Density:

Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Lalondeite =2.50 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Lalondeite= 2.76 barns/electron
U=PE_Lalondeite x r_electron= 6.90 barns/cc.

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

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

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

References:

NAME( CanMin v43:181) PHYS. PROP.(CanMin v43:181) OPTIC PROP.(CanMin v43:181)

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

Search for Lalondeite using:

[ALTAVISTA] [AOL] [bing] [GeoScienceWorld] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Lalondeite :

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Lapis Mineral Journal

Mineral News

UV Tools

Wrights Rock Shop

Translate Lalondeite Mineral Data :

Ask about Lalondeite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Lalondeite

(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2•3(H2O)
Dana No: 73.02.02d.02 Strunz No: 09.EE.85
Locality:

Notes: