Barysilite Mineral Data

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:

Pb₈Mn²⁺3(Si₂O₇)

IMA Status:

Valid Species (Pre-IMA) 1888

Locality:

Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.

Synonym:

ICSD 14370

PDF 23-404

Barysilite Image

Images:

Barysilite

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

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 ScalenohedralH-M Symbol (3 2/m) Space Group: R 3c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.198(1), 2.96(0.8), 3.307(0.8),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Lajzerowicz J , Acta Crystallographica , 20 (1965) p.357-363, Etude par diffraction des rayons X et absorption infra-rouge, de la barysilite, MnPb8.3Si2O7, et de composes isomorphes

Physical Properties of Barysilite

Cleavage:

[???] Perfect

Color:

White, Gray.

Density:

6.11 - 6.72, Average = 6.41

Diaphaniety:

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

Optical Data:

Uniaxial (-), e=2.015, w=2.033, bire=0.0180.

Calculated Properties of Barysilite

Electron Density:

r_electron=5.82 gm/cc
note: r_Barysilite=6.91 gm/cc.

Fermion Index

Fermion Index = 0.16885
Boson Index = 0.83115

Photoelectric:

PE_Barysilite=1,364.72 barns/electron
U=PE_Barysilite x r_electron=7,937.06 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Barysilite is Not Radioactive

Barysilite Classification

Dana Class:

55.2.3.1 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.2)with cations in [6] coordination

(55.2.3)Dana Group

55.2.3.1 Barysilite Pb8Mn(Si2O7)3 R 3c 3 2/m

Strunz Class:

VIII/C.06-10 VIII - Silicates

VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders

VIII/C.06 - Barysilite - Edgarbaileyite series

VIII/C.06-10 Barysilite Pb8Mn(Si2O7)3 R 3c 3 2/m

VIII/C.06-20 Edgarbaileyite Hg6Si2O7 C 2/m 2/m

Other Barysilite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana)

Search for Barysilite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Barysilite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Barysilite Mineral Data :

Ask about Barysilite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Barysilite Specimen Label here :

Barysilite

Pb8Mn(Si2O7)3
Dana No: 55.2.3.1 Strunz No: VIII/C.06-10
Locality:

Notes: