Roeblingite Mineral Data

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.

Name Pronunciation:

Roeblingite + Pronunciation

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 - Prismatic H-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),

Physical Properties of Roeblingite

Cleavage:

{001} Perfect, {100} Indistinct

Color:

White, Pink.

Density:

3.43

Diaphaneity:

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
Ncalc = 1.64

Optical Data:

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

Calculated Properties of Roeblingite

Electron Density:

Bulk Density (Electron Density)=3.24 gm/cc
note: Specific Gravity of Roeblingite =3.43 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Roeblingite is Not Radioactive

Roeblingite Classification

Dana Class:

64.02.02.01 (64)Cyclosilicates

(64.02)3-membered rings with other anion groups

(64.02.02)Dana Group

64.02.02.01 Roeblingite Pb2Ca6(Si6O18)(SO4)2(OH)2•4(H2O) C 2/m 2/m

Strunz Class:

09.CB.05 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CB -[Si3O9]6- 3-membered single rings, with insular complex anions

09.CB.05 Roeblingite Pb2Ca6(Si6O18)(SO4)2(OH)2•4(H2O) C 2/m 2/m

Other Roeblingite Information

References:

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

See Also:

Links to other databases for Roeblingite :
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 - Minerals of Franklin and Sterling Hill
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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

Roeblingite

Pb2Ca6(Si6O18)(SO4)2(OH)2•4(H2O)
Dana No: 64.02.02.01 Strunz No: 09.CB.05
Locality:

Notes:

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