Bytownite Mineral Data

Bytownite Mineral Data
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General Bytownite Information

Help on Chemical Formula: Chemical Formula: (Ca,Na)(Si,Al)4O8
Help on Composition: Composition: Molecular Weight = 275.01 gm
   Sodium     1.67 %  Na    2.25 % Na2O
   Calcium   11.66 %  Ca   16.31 % CaO
   Aluminum  17.66 %  Al   33.37 % Al2O3
   Silicon   22.47 %  Si   48.07 % SiO2
   Oxygen    46.54 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.2Ca0.8Al1.8Si2.2O8
Help on Environment: Environment: Magmatic and metamorphic rocks.
Help on IMA Status: IMA Status: Not Approved IMA 1835
Help on Locality: Locality: "Bytown," now Ottawa, Ontario, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Bytownite + Pronunciation Say BYTOWNITE
Help on Synonym: Synonym: Ab20
  An80
  ICSD 34791
  PDF 41-1481
 

Bytownite Image

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Bytownite   Plagioclase

Comments: Translucent crystalline bytownite.
Location: Crystal Bay, Hennepin County, Minnesota, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bytownite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.6357:1:1.0241
Help on Cell Dimensions: Cell Dimensions: a = 8.17, b = 12.85, c = 13.16, Z = 7; alpha = 93.5°, beta = 116.016°, gamma = 90.833° V = 1,239.15 Den(Calc)= 2.58
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): 3.2(1), 3.75(0.8), 4.03(0.8),
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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Facchinelli A , Bruno E , Chiari G , Acta Crystallographica, Section B , 35 (1979) p.34-42, The structure of bytownite quenched from 1723 K, Locality: satellite dyke, Traversella stock, Sesia Lanzo zone, Western Alps, Italy, Sample: BytQ, P-1 model

 

Physical Properties of Bytownite

Help on Cleavage: Cleavage: {001} Perfect, {010} Good
Help on Color: Color: Colorless, Gray, White.
Help on Density: Density: 2.7 - 2.72, Average = 2.71
Help on Diaphaneity: Diaphaneity: 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 Bytownite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.07 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2221,KPDmeas= 0.2114,KC= 0.2076
Ncalc = 1.54 - 1.56
Help on Optical Data: Optical Data: Biaxial (+/-), a=1.563-1.572, b=1.568-1.5784, g=1.573-1.583, bire=0.0100-0.0110, 2V(Calc)=80-88, 2V(Meas)=86.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Bytownite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.69 gm/cc
note: Specific Gravity of Bytownite =2.71 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBytownite = 2.84 barns/electron
U=PEBytownite x rElectron Density= 7.64 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bytownite is Not Radioactive
 

Bytownite Classification
Help on Dana Class: Dana Class: 76.01.03.05 (76)Tectosilicate Al-Si Framework
  (76.01)with Al-Si frameworks
  (76.01.03)Plagioclase series
 
76.01.03.00 Plagioclase* (Na,Ca)(Si,Al)4O8 C1 1
 
76.01.03.01 Albite NaAlSi3O8 C1 1
 
76.01.03.02 Oligoclase (Na,Ca)(Si,Al)4O8 C1 1
 
76.01.03.03 Andesine* (Na,Ca)(Si,Al)4O8 C1 1
 
76.01.03.04 Labradorite* (Ca,Na)(Si,Al)4O8 C1 1
 
76.01.03.05 Bytownite* (Ca,Na)(Si,Al)4O8 C1 1
 
76.01.03.06 Anorthite CaAl2Si2O8 P1,I1 1
Help on Strunz Class: Strunz Class: 09.FA.35 09 - SILICATES (Germanates)
  09.F - Tektosilicates without Zeolitic H2O
  09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1
 
09.FA.35 Albite NaAlSi3O8 C1 1
 
09.FA.35 Bytownite* (Ca,Na)(Si,Al)4O8 C1 1
 
09.FA.35 Anorthite CaAl2Si2O8 P1,I1 1
 
09.FA.35 Andesine* (Na,Ca)(Si,Al)4O8 C1 1
 
09.FA.35 Labradorite* (Ca,Na)(Si,Al)4O8 C1 1
 
09.FA.35 Oligoclase (Na,Ca)(Si,Al)4O8 C1 1
 
09.FA.35 Reedmergnerite NaBSi3O8 C1 1
 
09.FA.35 Plagioclase* (Na,Ca)(Si,Al)4O8 C1 1
 

Other Bytownite 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 Bytownite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineral and Gemstone Kingdom
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Bytownite

(Ca,Na)(Si,Al)4O8
Dana No: 76.01.03.05 Strunz No: 09.FA.35
Locality:

 

Notes: