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Rongibbsite

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Formula:
Pb2(Si4Al)O11(OH)
System:
Monoclinic
Colour:
Colorless
Hardness:
5
A zeolitic aluminosilicate. The first natural aluminosilicate with Pb as the only extraframework cation.

Classification of Rongibbsite

Approved 2010
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Type Occurrence of Rongibbsite

General Appearance of Type Material:
Elongated blades
Geological Setting of Type Material:
Quartz vein in a Proterozoic gneiss
Associated Minerals at Type Locality:

Physical Properties of Rongibbsite

Diaphaneity (Transparency):
Transparent
Colour:
Colorless
Streak:
White
Hardness (Mohs):
5
Comment:
~5
Cleavage:
Perfect
on {100}
Parting:
No parting observed
Density:
4.43 g/cm3 (Calculated)

Crystallography of Rongibbsite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Space Group Setting:
C2/m
Cell Parameters:
a = 7.8356(6) Å, b = 13.913(6) Å, c = 10.278(1) Å
β = 92.925(4)°
Ratio:
a:b:c = 0.563 : 1 : 0.739
Unit Cell Volume:
V 1119 ų
Morphology:
Bladed (elongated along the c axis, up to 0.70 × 0.20 × 0.05 mm), often in tufts. Dominant forms are {100}, {010}, {001}, and {101̄}.
Twinning:
Twinning is common across (100).
X-Ray Powder Diffraction Data:
d-spacingIntensity
6.821 (78)
6.075 (100)
3.990 (99)
3.481 (81)
3.478 (82)
3.322 (76)
2.842 (91)
2.753 (87)

Optical Data of Rongibbsite

Type:
Biaxial (+)
RI values:
nα = 1.690 nβ = 1.694 nγ = 1.700
2V:
Measured: 65° (2)
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of Rongibbsite

Formula:
Pb2(Si4Al)O11(OH)
Essential elements:
All elements listed in formula:
Analytical Data:
Electron microprobe analysis
Empirical Formula:
Pb2.05(Si3.89Al1.11)O11(OH) ·

Other Names for Rongibbsite

Name in Other Languages:

Other Information

Other Information:
Insoluble in water, acetone, or hydrochloric acid
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 Rongibbsite

Reference List:
Yang, H., Jenkins, R.A., Downs, R.T., Evans, S.H., Bloch, E.M. and Halpern, A.J. (2010) Rongibbsite, IMA 2010-055. CNMNC Newsletter No. 7, February 2010, page 29 Mineralogical Magazine, 75, 27-31.

Yang, H., Downs, R.T., Evans, S.H., Jenkins, R.A., Bloch, E.M. (2013): Rongibbsite, Pb2(Si4Al)O11(OH), a new zeolitic aluminosilicate mineral with an interrupted framework from Maricopa County, Arizona, U.S.A. American Mineralogist, 98, 236-241

Internet Links for Rongibbsite

Localities for Rongibbsite

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.
USA (TL)
 
  • Arizona
    • Maricopa Co.
      • Big Horn Mts
Yang, H., Jenkins, R.A., Downs, R.T., Evans, S.H., Bloch, E.M. and Halpern, A.J. (2010) Rongibbsite, IMA 2010-055. CNMNC Newsletter No. 7, February 2010, page 29 Mineralogical Magazine, 75, 27-31.;Yang, H., Downs, R.T., Evans, S.H., Jenkins, R.A., Bloch, E.M. (2013): Rongibbsite, Pb2(Si4Al)O11(OH), a new zeolitic aluminosilicate mineral with an interrupted framework from Maricopa County, Arizona, U.S.A. American Mineralogist, 98, 236-241
Mineral and/or Locality  
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