Barysilite Mineral Data
General Barysilite Information
Chemical Formula:
Pb8Mn(Si2O7)3
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
Empirical Formula:
Pb8 Mn2+ 3(Si2 O7 )
Environment:
As thin fllms and veinlets in a metamorphosed zinc orebody.
IMA Status:
Valid Species (Pre-IMA) 1888
Locality:
Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.
Name Origin:
From the Greek for heavy and for SILicon in its composition.
Name Pronunciation:
Barysilite + Pronunciation
Synonym:
ICSD 14370
PDF 23-404
Barysilite Image
Images:
Barysilite Crystallography
Axial Ratios:
a:c = 1:3.9002
Cell Dimensions:
a = 9.82, c = 38.3, Z = 6; V = 3,198.55 Den(Calc)= 6.91
Crystal System:
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3 c
X Ray Diffraction:
By Intensity(I/Io ): 3.198(1), 2.96(0.8), 3.307(0.8),
Physical Properties of Barysilite
Cleavage:
{???} Perfect
Color:
White, Gray.
Density:
6.11 - 6.72, Average = 6.41
Diaphaneity:
Transparent to translucent
Habit:
Massive - Lamellar - Distinctly foliated fine-grained forms.
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Adamantine
Magnetism:
Nonmagnetic
Streak:
white
Optical Properties of Barysilite
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
Optical Data:
Uniaxial (-), e=2.015, w=2.033, bire=0.0180.
Calculated Properties of Barysilite
Electron Density:
Bulk Density (Electron Density)=5.82 gm/cc note: Specific Gravity of Barysilite =6.91 gm/cc.
Fermion Index:
Fermion Index = 0.16 Boson Index = 0.84
Photoelectric:
PEBarysilite =1,364.72 barns/electronU=PEBarysilite x r Electron Density=7,937.06 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Barysilite is Not Radioactive
Barysilite Classification
Dana Class:
55.02.03.01 (55) Sorosilicate Si2O7 Groups, Generally with No Additional Anions
(55.02) with cations in [6] coordination
(55.02.03) Dana Group
55.02.03.01 Barysilite Pb8Mn(Si2O7)3 R 3 c 3 2/m
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 3 c 3 2/m
Other Barysilite Information
References:
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana)
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
17 - WWW-MINCRYST
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Barysilite
Pb8Mn(Si2O7)3
Dana No: 55.02.03.01 Strunz No: 09.BC.20
Locality:
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