Mineralogy Database

Barysilite Mineral Data

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General Barysilite Information

Help on Chemical  Formula: Chemical Formula: Pb8Mn(Si2O7)3
Help on Composition: Composition: Molecular Weight = 2,217.04 gm
   Manganese   2.48 %  Mn    3.20 % MnO
   Silicon     7.60 %  Si   16.26 % SiO2
   Lead       74.77 %  Pb   80.54 % PbO
   Oxygen     15.15 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb8Mn2+3(Si2O7)
Help on Environment: Environment: As thin fllms and veinlets in a metamorphosed zinc orebody.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1888
Help on Locality: Locality: Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for heavy and for SILicon in its composition.
Help on Name Pronunciation: Name Pronunciation: Barysilite + Pronunciation Say BARYSILITE
Help on Synonym: Synonym: ICSD 14370
  PDF 23-404

Barysilite Image

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Comments: Clear, round plates of barysilite on a manganiferous matrix.
Location: Langban, Varmland, Sweden. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Barysilite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:3.9002
Help on Cell Dimensions: Cell Dimensions: a = 9.82, c = 38.3, Z = 6; V = 3,198.55 Den(Calc)= 6.91
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.198(1), 2.96(0.8), 3.307(0.8),

Physical Properties of Barysilite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: White, Gray.
Help on Density: Density: 6.11 - 6.72, Average = 6.41
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Massive - Lamellar - Distinctly foliated fine-grained forms.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Barysilite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.084 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1482,KPDmeas= 0.1596,KC= 0.1472
Ncalc = 1.9 - 2.02
Help on Optical Data: Optical Data: Uniaxial (-), e=2.015, w=2.033, bire=0.0180.

Calculated Properties of Barysilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.82 gm/cc
note: Specific Gravity of Barysilite =6.91 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.16
Boson Index = 0.84
Help on Photoelectric: Photoelectric: PEBarysilite =1,364.72 barns/electron
U=PEBarysilite x rElectron Density=7,937.06 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Barysilite is Not Radioactive

Barysilite Classification

Help on  Dana Class: Dana Class: (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.02)with cations in [6] coordination
  (55.02.03)Dana Group Barysilite Pb8Mn(Si2O7)3 R 3c 3 2/m
Help on  Strunz Class: Strunz Class: 09.BC.20 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BC -Si2O7 groups, without non-tetrahedral anions;
09.BC.20 Barysilite Pb8Mn(Si2O7)3 R 3c 3 2/m

Other Barysilite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana)
Help on See Also: See Also: Links to other databases for Barysilite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
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.BC.20





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