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Chromschieffelinite

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Formula:
Pb10Te6+6O20(OH)14(CrO4)(H2O)5
Colour:
pale yellow
Lustre:
Adamantine
Hardness:
2
Specific Gravity:
5.892 (Calculated)
Crystal System:
Orthorhombic
Name:
For being the Chrome analogue of schieffelinite.
Isostructural with:
Chromate analogue of schieffelinite.


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Classification of ChromschieffeliniteHide

Approved
Approval Year:
2011

Physical Properties of ChromschieffeliniteHide

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

Optical Data of ChromschieffeliniteHide

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 ChromschieffeliniteHide

Formula:
Pb10Te6+6O20(OH)14(CrO4)(H2O)5
IMA Formula:
Pb10Te6+6O20(OH)14(CrO4) · 5H2O

Crystallography of ChromschieffeliniteHide

Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
C2 2 21
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 V:
1,980.34 ų (Calculated from Unit Cell)
Z:
2

Type Occurrence of ChromschieffeliniteHide

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.
Associated Minerals at Type Locality:

Synonyms of ChromschieffeliniteHide

Other InformationHide

Notes:
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 ChromschieffeliniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 ChromschieffeliniteHide

Localities for ChromschieffeliniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • California
    • San Bernardino Co.
      • Silver Lake District
        • Soda Mts
          • 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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