Mineralogy Database

Leucosphenite Mineral Data

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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 Name Pronunciation: Name Pronunciation: Leucosphenite + Pronunciation Say LEUCOSPHENITE
Help on Synonym: Synonym: ICSD 20149
  PDF 25-784

Leucosphenite Image

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

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Comments: Glassy crystal of leucosphenite in mudstone.
Location: Carter Oil Co. Poulson No. 1 Well, Uinta Basin, Duchesne Co, Utah, USA. Scale: Overall: 2 x 1.5 x 2 cm.
© Tom Loomis / Dakota Matrix

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 - Prismatic H-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),

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 Diaphaneity: Diaphaneity: 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
Ncalc = 1.67 - 1.69
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: Bulk Density (Electron Density)=2.94 gm/cc
note: Specific Gravity of Leucosphenite =3.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PELeucosphenite = 54.13 barns/electron
U=PELeucosphenite x rElectron Density= 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)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.05)with corrugated and complex layers
  (72.05.02)Leucospenite and related species Leucosphenite Na4BaTi2O2[B2Si10O28] C 2/m 2/m Nordite-(Ce) (Ce,La,Ca)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17 Pcca 2/m 2/m 2/m Nordite-(La) (Na,Mn)3(Sr,Ca)(La,Ce)(Zn,Mg)Si6O17 Pcca 2/m 2/m 2/m Semenovite (Na,Ca)9(Ce,La)2(Fe,Mn)(Si,Be)20(O,OH,F)48 Pmmn 2/m 2/m 2/m Ferronordite-(Ce)! Na3SrCeFeSi6O17 Pcca 2/m 2/m 2/m Manganonordite-(Ce)! Na3SrCeMnSi6O17 Pcca 2/m 2/m 2/m Ferronordite-(La)! Na3Sr(La,Ce)FeSi6O17 Pcca 2/m 2/m 2/m Bussyite-(Ce)! (Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4 C 2/c 2/m
Help on  Strunz Class: Strunz Class: 09.DP.15 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DP -Transitional ino-phyllosilicate structures
09.DP.15 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 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 09.DP.15





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