General Leucosphenite Information Chemical Formula: |
Na4BaTi2O2[B2Si10O28] |
Composition: |
Molecular Weight = 1,107.50 gm |
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Barium 12.40 % Ba 13.84 % BaO |
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Sodium 8.30 % Na 11.19 % Na2O |
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Titanium 8.65 % Ti 14.43 % TiO2 |
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Silicon 25.36 % Si 54.25 % SiO2 |
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Boron 1.95 % B 6.29 % B2O3 |
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Oxygen 43.34 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Na4BaTi2B2Si10O30 |
Environment: |
Found in the Tertiary-aged Green River Formation, Utah, USA. |
IMA Status: |
Valid Species (Pre-IMA) 1901 |
Locality: |
Narsarsuk, Julianehaab district, Southern Greenland. Link to MinDat.org Location Data. |
Name Origin: |
Named in 1901 by Flink from the Greek for white (=leuco) and wedge (=sphen), in allusion to its color and morphology. |
Name Pronunciation: |
Leucosphenite + Pronunciation |
Synonym: |
ICSD 20149 |
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PDF 25-784 |
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Leucosphenite Crystallography Axial Ratios: |
a:b:c =0.5823:1:0.4278 |
Cell Dimensions: |
a = 9.814, b = 16.851, c = 7.21, Z = 2; beta = 93° V = 1,190.72 Den(Calc)= 3.09 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m |
X Ray Diffraction: |
By Intensity(I/Io): 4.22(1), 8.45(0.9), 3.37(0.7), |
Crystal Structure:
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Mouse
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| Physical Properties of Leucosphenite Cleavage: |
{010} Perfect, {001} Fair |
Color: |
Colorless, Lemon yellow, Brown, Pale blue. |
Density: |
3 - 3.09, Average = 3.04 |
Diaphaneity: |
Transparent to translucent |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Pseudo Hexagonal - Crystals show a hexagonal outline. |
Habit: |
Striated - Parallel lines on crystal surface or cleavage face. |
Habit: |
Wedge shaped - Crystals shaped like a wedge. |
Hardness: |
6-6.5 - Orthoclase-Pyrite |
Luminescence: |
Fluorescent, Short UV=yellowish white. |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
| Optical Properties of Leucosphenite 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 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. |
Pleochroism (x): |
colorless. |
Pleochroism (y): |
colorless. |
Pleochroism (z): |
colorless. |
| Calculated Properties of Leucosphenite Electron Density: |
Bulk Density (Electron Density)=2.94 gm/cc |
note: Specific Gravity of Leucosphenite =3.05 gm/cc. Fermion Index: |
Fermion Index = 0.04 |
Boson Index = 0.96 Photoelectric: |
PELeucosphenite = 54.13 barns/electron |
U=PELeucosphenite x rElectron Density= 158.93 barns/cc. Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Leucosphenite is Not Radioactive | Leucosphenite Classification Dana Class: |
72.05.02.01 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings |
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(72.05)with corrugated and complex layers |
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(72.05.02)Leucospenite and related species |
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Strunz Class: |
09.DP.15 09 - SILICATES (Germanates) |
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09.D - Inosilicates* Structural terminology according to Liebau (1985) |
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09.DP -Transitional ino-phyllosilicate structures |
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| Other Leucosphenite Information References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) |
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 17 - WWW-MINCRYST Search for Leucosphenite using: Visit our Advertisers for Leucosphenite : A Bijoux Google Search for LeucospheniteAdam's Minerals Google Search for Leucosphenite Cape Minerals Google Search for Leucosphenite Dakota Matrix Minerals Google Search for Leucosphenite Excalibur Mineral Corp. Google Search for Leucosphenite Exceptional Minerals Google Search for Leucosphenite John Betts Fine Minerals Search for Leucosphenite McDougall Minerals Google Search for Leucosphenite Mineral News Website Link Rock and Mineral Shows Google Search for Leucosphenite Weinrich Minerals, Inc. Google Search for Leucosphenite Ask about Leucosphenite here : Print or Cut-and-Paste your Leucosphenite Specimen Label here :
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