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Chromschieffelinite

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Formula:
Pb10Te66+O20(OH)14(CrO4)(H2O)5
System:
Orthorhombic
Colour:
pale yellow
Hardness:
2
Name:
For being the Chrome analogue of schieffelinite.
Isostructural with:
Chromate analogue of schieffelinite.


Classification of Chromschieffelinite

Approved
Approval Year:
2011

Type Occurrence of Chromschieffelinite

General Appearance of Type Material:
blocky to tabular on {010} with striations parallel to [001] and are up to 0.2 mm in maximum dimension.
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, catalog number 63511.
Geological Setting of Type Material:
oxidation zone of hydrothermal ore deposit containing tellurides and galena.

Physical Properties of Chromschieffelinite

Adamantine
Colour:
pale yellow
Streak:
pale yellow
Hardness (Mohs):
2
Tenacity:
Brittle
Cleavage:
Perfect
{010}
Density:
5.892 g/cm3 (Calculated)

Crystallography of Chromschieffelinite

Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
C2 2 21
Space Group Setting:
C2 2 21
Cell Parameters:
a = 9.6646(3) Å, b = 19.4962(8) Å, c = 10.5101(7) Å
Ratio:
a:b:c = 0.496 : 1 : 0.539
Unit Cell Volume:
V 1,980.34 ų (Calculated from Unit Cell)
Z:
2

Optical Data of Chromschieffelinite

Type:
Biaxial (-)
RI values:
nα = 1.930(5) nβ = 1.960(5) nγ = 1.975(5)
2V:
Measured: 68° (2), Calculated: 69.6°
Max Birefringence:
δ = 0.045
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r < v, strong
Pleochroism:
Non-pleochroic

Chemical Properties of Chromschieffelinite

Formula:
Pb10Te66+O20(OH)14(CrO4)(H2O)5
All elements listed in formula:

Other Names for Chromschieffelinite

Name in Other Languages:

Other Information

Other Information:
by analogy to schieffelinite, chromschieffelinite is expected to be readily soluble in cold dilute HCl or HNO3.
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 Chromschieffelinite

Reference List:
Marty, J., Kampf, A. R., Housley, R. M., Mills, S. J. & Weiß, S.. (2010). Seltene neue Tellurmineralien aus Kalifornien, Utah, Arizona und New Mexiko (USA). Lapis, 35 (12), 42-51; 66. [as unnamed Cr analogue of schieffelinite]

Kampf, A. R., Mills, S. J., Housley, R. M., Rumsey, M. S., & Spratt, J. (2012). Lead-tellurium oxysalts from Otto Mountain near Baker, California: VII. Chromschieffelinite, Pb10Te6O20 (OH) 14 (CrO4)(H2O) 5, the chromate analog of schieffelinite. American Mineralogist, 97(1), 212-219.

Internet Links for Chromschieffelinite

mindat.org URL:
http://www.mindat.org/min-41959.html
Please feel free to link to this page.

Localities for Chromschieffelinite

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)
 
  • California
    • San Bernardino Co.
      • Baker
        • Otto Mountain
Anthony R. Kampf, Stuart J. Mills, Robert M. Housley, Michael S. Rumsey, and John Spratt (2012), Lead-tellurium oxysalts from Otto Mountain near Baker, California: VII. Chromschieffelinite, Pb10Te6O20(CrO4)(H2O)5, the chromate analogue of schieffelinite. American Mineralogist: 97: 212-219.
Mineral and/or Locality  
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