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Roeblingite

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Washington Augustus Roebling
Formula:
Pb2Ca6Mn2+(Si3O9)2(SO4)2(OH)2 · 4H2O
System:
Monoclinic
Colour:
White, greyish white
Hardness:
3
Name:
Named in 1897 by Samuel Lewis Penfield and Harry Ward Foote in honor of Colonel Washington A. Roebling (1837 – 1926), founder of the Mineralogical Society of America, engineer, inventor of the diving bell, builder of the Brooklyn Bridge, and avid mineral collector, donated collection to Smithsonian.
This page provides mineralogical data about Roeblingite.

Classification of Roeblingite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.CB.05

9 : SILICATES (Germanates)
C : Cyclosilicates
B : [Si3O9]6- 3-membered single rings, with insular complex anions
64.2.2.1

64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
2 : Rings with Other Anions and Insular Silicate Groups: 3-membered rings with other anion groups
17.10.25

17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate
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Type Occurrence of Roeblingite

General Appearance of Type Material:
Porcelanous
Year of Discovery:
1897
Geological Setting of Type Material:
highly altered (metasomatized) zone in a zinc-manganese-iron silicate-oxide orebody

Occurrences of Roeblingite

Geological Setting:
Metamorphosed manganese deposits.

Physical Properties of Roeblingite

Diaphaneity (Transparency):
Transparent, Opaque
Colour:
White, greyish white
Streak:
White
Hardness (Mohs):
3
Cleavage:
Perfect
on {001}
Density:
3.433 g/cm3 (Measured)    3.44 g/cm3 (Calculated)

Crystallography of Roeblingite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 13.208Å, b = 8.287Å, c = 13.089Å
β = 106.65°
Ratio:
a:b:c = 1.594 : 1 : 1.579
Unit Cell Volume:
V 1,372.59 ų (Calculated from Unit Cell)
Z:
2
Morphology:
As dense, compact masses of tiny lathlike crystals.

Optical Data of Roeblingite

Type:
Biaxial (+)
RI values:
nα = 1.640 nβ = 1.640 nγ = 1.660
2V:
Measured: 61° (2), Calculated: 61°
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively weak r < v

Chemical Properties of Roeblingite

Formula:
Pb2Ca6Mn2+(Si3O9)2(SO4)2(OH)2 · 4H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Sr,Na,K,C

Relationship of Roeblingite to other Species

9.CB.10Diversilite-(Ce)Na2(Ba,K)6Fe2+Ce2Ti3(Si3O9)3(HSiO4)3(OH,H2O)9
9.CB.15Ilímaussite-(Ce)(Na,K)7-8(Ba,K)10Ce5(Nb,Ti)6(Si3O9)4(Si9O18)O6(O,OH)24
17.10.1NoseanNa8(Al6Si6O24)(SO4) · H2O
17.10.2PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2O
17.10.3Vishnevite(Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2O
17.10.4Haüyne(Na,Ca)4-8(Al6Si6O24)(SO4,S,Cl)1-2
17.10.5Liottite(Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4
17.10.6Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)
17.10.7Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
17.10.8MicrosommiteNa4K2Ca2(Al6Si6O24)(SO4)Cl2
17.10.9Delhayelite(Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2O
17.10.10HydrodelhayeliteKCa2AlSi7O17(OH)2 · 6H2O
17.10.11Davyne(Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2
17.10.12Afghanite(Na,Ca,K)8(Al6Si6O24)(Cl2,SO4,CO3)3 · 0.5H2O
17.10.13Franzinite(Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2O
17.10.14Giuseppettite(Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2
17.10.15Sacrofanite(Na,K)98Ca20(Al6Si6O24)14(SO4)26Cl2 · 8H2O
17.10.16Chessexite(Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2O
17.10.17InneliteNa2CaBa4Ti3(Si2O7)2(SO4)2O4
17.10.18ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
17.10.19Ellestadite
17.10.20Ellestadite-(Cl)Ca10(SiO4)3(SO4)3Cl2
17.10.21HydroxylellestaditeCa5(SiO4)1.5(SO4)1.5(OH)
17.10.22FluorellestaditeCa5(SiO4)1.5(SO4)1.5F
17.10.23MattheddleitePb5(SiO4)1.5(SO4)1.5(Cl,OH)
17.10.24QueititePb4Zn2(SO4)(SiO4)(Si2O7)
17.10.26YoshimuraiteBa2Mn2Ti(Si2O7)(PO4)O(OH)
17.10.27KegelitePb8Al4(Si8O20)(SO4)2(CO3)4(OH)8
17.10.28Wenkite(Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2O
17.10.29MacquartiteCu2Pb7(CrO4)4(SiO4)2(OH)2
17.10.30WeliniteMn62+(W6+,Mg)2(SiO4)2(O,OH)6

Other Names for Roeblingite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Roeblingite

Reference List:
American Mineralogist (1931): 16: 455.

Palache, C. (1935), USGS PP 180: 113.

Hurlbut, C.S., Jr. & Baum, J.L. (1960): American Mineralogist: 45: 1137-1143.

American Mineralogist (1966): 51: 504-508.

Dunn, P.J. (1983): Mineralogical Record: 14: 203-204.

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

Braithwaite, R. S. W. (1985): Roeblingite: a revised formula from infra-red and thermal analysis data. Mineralogical Magazine, 49, 756-758.

Dunn, Pete J. (1995): Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits, part 4: 503.

Internet Links for Roeblingite

Localities for Roeblingite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Sweden
 
  • Värmland
    • Filipstad
Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
USA
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Dunn, P.J.: Min.Rec.:14:203-204 (1983); Hurlbut, C.S., Jr. & Baum, J.L.: Am.Min.:45:1137-1143 (1960); Palache(1935):113; Dunn(1995):Pt4:503.
FOMS Millsite Committee (1986) (circa), List of Mineral Species Found on the Franklin Mill Site, Franklin-Ogdensburg Mineralogical Society (unpublished).
Palache(1935):113; Dunn(1995):Pt4:503.
Mineral and/or Locality  
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