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pale yellow
Specific Gravity:
5.892 (Calculated)
Crystal System:
For being the Chrome analogue of schieffelinite.
Isostructural with:
Chromate analogue of schieffelinite.

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Classification of ChromschieffeliniteHide

Approval Year:

Physical Properties of ChromschieffeliniteHide

pale yellow
pale yellow
5.892 g/cm3 (Calculated)

Optical Data of ChromschieffeliniteHide

Biaxial (-)
RI values:
nα = 1.930(5) nβ = 1.960(5) nγ = 1.975(5)
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
r < v, strong

Chemical Properties of ChromschieffeliniteHide

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

Crystallography of ChromschieffeliniteHide

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

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

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.
  • 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.
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