Leucosphenite Mineral Data + Say LEUCOSPHENITE


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General Leucosphenite Information

Help on Chemical  Formula: Chemical Formula: Na4BaTi2O2[B2Si10O28]
Help on Composition: Composition: Molecular Weight = 1,107.50 gm
   Barium    12.40 %  Ba   13.84 % BaO
   Sodium     8.30 %  Na   11.19 % Na2O
   Titanium   8.65 %  Ti   14.43 % TiO2
   Silicon   25.36 %  Si   54.25 % SiO2
   Boron      1.95 %  B     6.29 % B2O3
   Oxygen    43.34 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na4BaTi2B2Si10O30
Help on Environment: Environment: Found in the Tertiary-aged Green River Formation, Utah, USA.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1901
Help on Locality: Locality: Narsarsuk, Julianehaab district, Southern Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1901 by Flink from the Greek for white (=leuco) and wedge (=sphen), in allusion to its color and morphology.
Help on Synonym: Synonym: ICSD 20149
  PDF 25-784
 

Leucosphenite Image

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Leucosphenite

Comments: Glassy crystal of leucosphenite in mudstone.
Location: Uintah Basin, Uintah County, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Leucosphenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5823:1:0.4278
Help on Cell Dimensions: Cell Dimensions: a = 9.814, b = 16.851, c = 7.21, Z = 2; beta = 93° V = 1,190.72 Den(Calc)= 3.09
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.22(1), 8.45(0.9), 3.37(0.7),
Click Here for Large Leucosphenite Structure Window Crystal Structure:

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Malinovskii Yu A , Yamnova N A , Belov N V , Doklady Akademii Nauk SSSR , 257 (1981) p.1128-1132, The refined crystal structure of the leucosphenite

 

Physical Properties of Leucosphenite

Help on Cleavage: Cleavage: [010] Perfect, [001] Fair
Help on Color: Color: Colorless, Lemon yellow, Brown, Pale blue.
Help on Density: Density: 3 - 3.09, Average = 3.04
Help on Diaphaniety: Diaphaniety: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Habit: Habit: Wedge shaped - Crystals shaped like a wedge.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luminescence: Luminescence: Fluorescent, Short UV=yellowish white.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Leucosphenite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2149,KPDmeas= 0.2181,KC= 0.222
Help on Optical Data: Optical Data: Biaxial (+), a=1.643-1.649, b=1.657-1.664, g=1.681-1.691, bire=0.0380-0.0420, 2V(Calc)=76, 2V(Meas)=77. Dispersion weak, r > v.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Leucosphenite

Help on Electron Density: Electron Density:

relectron=2.94 gm/cc
note: rLeucosphenite =3.05 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.04921
Boson Index = 0.95079
Help on Photoelectric: Photoelectric:

PELeucosphenite = 54.13 barns/electron
U=PELeucosphenite x relectron= 158.93 barns/cc.

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

Leucosphenite is Not Radioactive

 

Leucosphenite Classification

Help on  Dana Class: Dana Class: 72.5.2.1 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.5)with corrugated and complex layers
  (72.5.2)Leucospenite and related species
 
72.5.2.1 Leucosphenite Na4BaTi2O2[B2Si10O28] C 2/m 2/m
 
72.5.2.2 Nordite-(Ce) (Ce,La,Ca)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17 Pcca 2/m 2/m 2/m
 
72.5.2.3 Nordite-(La) (Na,Mn)3(Sr,Ca)(La,Ce)(Zn,Mg)Si6O17 Pcca 2/m 2/m 2/m
 
72.5.2.4 Semenovite (Na,Ca)9(Ce,La)2(Fe,Mn)(Si,Be)20(O,OH,F)48 Pmmn 2/m 2/m 2/m
 
72.5.2.5 Ferronordite-(Ce)! Na3SrCeFeSi6O17 Pcca 2/m 2/m 2/m
 
72.5.2.6 Manganonordite-(Ce)! Na3SrCeMnSi6O17 Pcca 2/m 2/m 2/m
 
72.5.2.7 Ferronordite-(La)! Na3Sr(La,Ce)FeSi6O17 Pcca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: VIII/G.10-10 VIII - Silicates
  VIII/G - Intermediate between chain- and layered silicates
  VIII/G.10 - Leucosphenite series
 
VIII/G.10-10 Leucosphenite Na4BaTi2O2[B2Si10O28] C 2/m 2/m
 

Other Leucosphenite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Leucosphenite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - WWW-MINCRYST 16 -École des Mines de Paris

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Leucosphenite

Na4BaTi2O2[B2Si10O28]
Dana No: 72.5.2.1 Strunz No: VIII/G.10-10
Locality:

 

Notes:

 

 
   
 
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