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Roeblingite Mineral Data

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General Roeblingite Information

Help on Chemical  Formula: Chemical Formula: Pb2Ca6(Si6O18)(SO4)2(OH)2•4(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Pb2Ca6Si6O18(SO4)2(OH)2•4(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1897
Help on Locality: Locality: Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Washington A. Roebling (1837-1926), well known mineral collector and builder of the Brooklyn Bridge.
Help on Name Pronunciation: Name Pronunciation: Roeblingite + Pronunciation Say ROEBLINGITE
Help on Synonym: Synonym: ICSD 40097
  PDF 16-411

Roeblingite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.5938:1:1.5806
Help on Cell Dimensions: Cell Dimensions: a = 13.208, b = 8.287, c = 13.099, Z = 2; beta = 106.65° V = 1,373.63 Den(Calc)= 3.41
Help on Crystal System: 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/Io): 2.94(1), 3(0.9), 3.1(0.8),

Physical Properties of Roeblingite

Help on Cleavage: Cleavage: {001} Perfect, {100} Indistinct
Help on Color: Color: White, Pink.
Help on Density: Density: 3.43
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Roeblingite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.64, b=1.64, g=1.66, bire=0.0200

Calculated Properties of Roeblingite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.24 gm/cc
note: Specific Gravity of Roeblingite =3.43 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PERoeblingite = 480.60 barns/electron
U=PERoeblingite x rElectron Density=1,557.74 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Roeblingite is Not Radioactive

Roeblingite Classification

Help on  Dana Class: Dana Class: (64)Cyclosilicates
  (64.02)3-membered rings with other anion groups
  (64.02.02)Dana Group Roeblingite Pb2Ca6(Si6O18)(SO4)2(OH)2•4(H2O) C 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 09.CB.05





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