Roeblingite Mineral Data

Roeblingite Mineral Data +

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General Roeblingite Information

Chemical Formula:

Pb2Ca6(Si6O18)(SO4)2(OH)2·4(H2O)

Composition:

Molecular Weight = 1,409.57 gm

Calcium 17.06 % Ca 23.87 % CaO

Silicon 11.95 % Si 25.58 % SiO₂

Hydrogen 0.72 % H 6.39 % H₂O

Lead 29.40 % Pb 31.67 % PbO

Sulfur 4.55 % S 11.36 % SO₃

Oxygen 36.32 % O

______ ______

100.00 % 98.86 % = TOTAL OXIDE

Empirical Formula:

Pb₂Ca₆Si₆O₁₈(SO₄)₂(OH)₂·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1897

Locality:

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

Name Origin:

Named after Washington A. Roebling (1837-1926), well known mineral collector and builder of the Brooklyn Bridge.

Synonym:

ICSD 40097

PDF 16-411

Roeblingite Image

Images:

Roeblingite

Comments: Pure white opaque porcelaneous roeblingite mass.
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Roeblingite Crystallography

Axial Ratios:

a:b:c =1.5938:1:1.5806

Cell Dimensions:

a = 13.208, b = 8.287, c = 13.099, Z = 2; beta = 106.65° V = 1,373.63 Den(Calc)= 3.41

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.94(1), 3(0.9), 3.1(0.8),

Crystal Structure:

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Moore P B , Shen J , American Mineralogist , 69 (1984) p.1173-1179, Roeblingite, Pb2Ca6(SO4)2(OH)2(H2O)4[Mn(Si3O9)2]: Its crystal structure and, comments on the lone pair effect

Physical Properties of Roeblingite

Cleavage:

[001] Perfect, [100] Indistinct

Color:

White, Pink.

Density:

3.43

Diaphaniety:

Transparent to translucent

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Roeblingite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1896,KPDmeas= 0.1885,KC= 0.1873

Optical Data:

Biaxial (+), a=1.64, b=1.64, g=1.66, bire=0.0200

Calculated Properties of Roeblingite

Electron Density:

r_electron=3.24 gm/cc
note: r_Roeblingite=3.43 gm/cc.

Fermion Index

Fermion Index = 0.0713
Boson Index = 0.9287

Photoelectric:

PE_Roeblingite= 480.60 barns/electron
U=PE_Roeblingite x r_electron=1,557.74 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Roeblingite is Not Radioactive

Roeblingite Classification

Dana Class:

64.2.2.1 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups

(64.2)3-membered rings with other anion groups

(64.2.2)Dana Group

64.2.2.1 Roeblingite Pb2Ca6(Si6O18)(SO4)2(OH)2·4(H2O) C 2/m 2/m

Strunz Class:

VIII/E.02-30 VIII - Silicates

VIII/E - Cyklosilicates, triplet rings [Si3O9]6-

VIII/E.02 - Walstromite - Mathewrogersite series

VIII/E.02-10 Walstromite BaCa2Si3O9 P1 1

VIII/E.02-20 Margarosanite Pb(Ca,Mn)2Si3O9 P1 1

VIII/E.02-30 Roeblingite Pb2Ca6(Si6O18)(SO4)2(OH)2·4(H2O) C 2/m 2/m

VIII/E.02-40 Mathewrogersite Pb7(Fe,Cu)Al3GeSi12O36·(OH,H2O)6 R 3,R 3-,R 32,R 3m,R 3m- Trig

Other Roeblingite Information

References:

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

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Roeblingite

Pb2Ca6(Si6O18)(SO4)2(OH)2·4(H2O)
Dana No: 64.2.2.1 Strunz No: VIII/E.02-30
Locality:

Notes: