Barysilite Mineral Data

Barysilite Mineral Data +

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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:

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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)

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Barysilite

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

Notes: