Labradorite Mineral Data + Say LABRADORITE

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General Labradorite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na)(Si,Al)4O8
Help on Composition: Composition: Molecular Weight = 271.81 gm
   Sodium     3.38 %  Na    4.56 % Na2O
   Calcium    8.85 %  Ca   12.38 % CaO
   Aluminum  15.88 %  Al   30.01 % Al2O3
   Silicon   24.80 %  Si   53.05 % SiO2
   Oxygen    47.09 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.4Ca0.6Al1.6Si2.4O8
Help on Environment: Environment: Magmatic and metamorphic rocks.
Help on IMA Status: IMA Status: Not Approved IMA 1780
Help on Locality: Locality: Labrador peninsula, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Synonym: Synonym: Ab40
  An60
  Spectrolite
 

Labradorite Image

Click Here for Larger Labradorite Image in a New Browser Window Images:
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Labradorite   Plagioclase

Comments: Dual view of a cleavage fragment of labradorite showing the multi-colored labradorescence (schiller effect) and the same area viewed without the color. The color is due to optical interference on the 010 polysynthetic twinning planes (Albite Law).
Location: Ihosy, Betroka district, Toliara Province, Madagascar. Scale: Picture size 3x3 cm.
© Dave Barthelmy

Labradorite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6351:1:0.7912
Help on Cell Dimensions: Cell Dimensions: a = 8.155, b = 12.84, c = 10.16, Z = 6; alpha = 93.5°, beta = 116.25°, gamma = 89.133° V = 952.25 Den(Calc)= 2.84
Help on Crystal System: Crystal System: Triclinic - PinacoidalH-M Symbol ( 1) Space Group: C1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.18(1), 3.21(0.7), 3.76(0.7),
Help on Forms: Forms:

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Forms: [ 0 0 1] [ 1 0 0] [ 1 0 1] [ 0 1 0]

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Click Here for Large Labradorite Structure Window Crystal Structure:

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Wenk H R , Joswig W , Tagai T , Korekawa M , Smith B K , American Mineralogist , 65 (1980) p.81-95, The average structure of An 62-66 labradorite, Surtsey x-ray, feldspar

View Additional jPOWD Structure files for Labradorite
[1] [2] [3] [4] [5]
 

Physical Properties of Labradorite

Help on Cleavage: Cleavage: [001] Perfect, [010] Good, [110] Distinct
Help on Color: Color: Colorless, Gray, Gray white, White, Light green.
Help on Density: Density: 2.68 - 2.71, Average = 2.69
Help on Diaphaniety: Diaphaniety: Translucent to transparent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 7 - Quartz
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Labradorite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1983,KPDmeas= 0.2089,KC= 0.2071
Help on Optical Data: Optical Data: Biaxial (+), a=1.554-1.563, b=1.5588-1.5675, g=1.562-1.573, bire=0.0080-0.0100, 2V(Calc)=78-86, 2V(Meas)=85.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Labradorite

Help on Electron Density: Electron Density:

relectron=2.67 gm/cc
note: rLabradorite =2.70 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01192
Boson Index = 0.98808
Help on Photoelectric: Photoelectric:

PELabradorite = 2.56 barns/electron
U=PELabradorite x relectron= 6.84 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Labradorite is Not Radioactive

 

Labradorite Classification

Help on  Dana Class: Dana Class: 76.1.3.4 (76)Tectosilicate Al-Si Framework
  (76.1)with Al-Si frameworks
  (76.1.3)Plagioclase series
 
76.1.3.0 Plagioclase* (Na,Ca)(Si,Al)4O8 C1 1
 
76.1.3.1 Albite NaAlSi3O8 C1 1
 
76.1.3.2 Oligoclase (Na,Ca)(Si,Al)4O8 C1 1
 
76.1.3.3 Andesine* (Na,Ca)(Si,Al)4O8 C1 1
 
76.1.3.4 Labradorite * (Ca,Na)(Si,Al)4O8 C1 1
 
76.1.3.5 Bytownite* (Ca,Na)(Si,Al)4O8 C1 1
 
76.1.3.6 Anorthite CaAl2Si2O8 P1,I1 1
Help on  Strunz Class: Strunz Class: VIII/J.07-50 VIII - Silicates
  VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders
  VIII/J.07 - Feldspar group, Anorthoclase - Anorthite - Banalcite series
 
VIII/J.07-10 Anorthoclase (Na,K)AlSi3O8 C1 1
 
VIII/J.07-20 Albite NaAlSi3O8 C1 1
 
VIII/J.07-30 Oligoclase (Na,Ca)(Si,Al)4O8 C1 1
 
VIII/J.07-40 Andesine* (Na,Ca)(Si,Al)4O8 C1 1
 
VIII/J.07-50 Labradorite (Ca,Na)(Si,Al)4O8 C1 1
 
VIII/J.07-60 Bytownite* (Ca,Na)(Si,Al)4O8 C1 1
 
VIII/J.07-70 Anorthite CaAl2Si2O8 P1,I1 1
 
VIII/J.07-75 Dmisteinbergite CaAl2Si2O8 P 6/mmm 6/m 2/m 2/m
 
VIII/J.07-80 Svyatoslavite CaAl2Si2O8 P 21 2
 
VIII/J.07-90 Stronalsite SrNa2Al4Si4O16 I bam,Iba2 Ortho
 
VIII/J.07-100 Banalsite BaNa2Al4Si4O16 I bam 2/m 2/m 2/m
 
VIII/J.07-110 Filatovite! K[(Al,Zn)2(As,Si)2O8] I2/c 2/m
 

Other Labradorite Information

Help on References: References: NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Labradorite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 -Christie Rowe 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 - Glendale Community College 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (MinSocAm) 11 -Handbook of Mineralogy (UofA) 12 - HyperPhysics 13 -MinDAT 14 -MinMax(Deutsch) 15 -MinMax(English) 16 - Mineral and Gemstone Kingdom 17 -Mineralienatlas (Deutsch) 18 -QUT Mineral Atlas 19 - Scandinavian mineral gallery 20 - Tradeshop.com - The Rainbow of Gems 21 - WWW-MINCRYST 22 -École des Mines de Paris

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

Labradorite

(Ca,Na)(Si,Al)4O8
Dana No: 76.1.3.4 Strunz No: VIII/J.07-50
Locality:

 

Notes:

 

 
   
 
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