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Telluroperite

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About TelluroperiteHide

Formula:
Pb3TeO4Cl2
Colour:
bluish-green
Lustre:
Adamantine
Hardness:
2 - 3
Specific Gravity:
7.323 (Calculated)
Crystal System:
Orthorhombic
Name:
Named as the tellurium analog of perite.

Per Adolf Geijer (7 May 1886, Svea Artillery Government's Assembly, Sweden - 18 April 1976, Danderyd, Sweden) was an economic geologist with the Swedish Geological Survey (SGU), and professor at the Royal Institute of Technology.
Isostructural with:
This page provides mineralogical data about Telluroperite.


Classification of TelluroperiteHide

Approved
Approval Year:
2009

Physical Properties of TelluroperiteHide

Adamantine
Transparency:
Transparent
Colour:
bluish-green
Streak:
pale bluish-green
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}
Fracture:
Sub-Conchoidal
Comment:
curved fracture
Density:
7.323 g/cm3 (Calculated)

Optical Data of TelluroperiteHide

Type:
Biaxial (-)
RI values:
nα = 2.091 nβ = 2.237 nγ = 2.242
2V:
Measured: 10°
Max Birefringence:
δ = 0.151
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Visible
Comments:
moderate bluish-green pleochrosim with absorption: X < Y = Z
Comments:
calculated

Chemical Properties of TelluroperiteHide

Formula:
Pb3TeO4Cl2
IMA Formula:
Pb(Te0.5Pb0.5)O2Cl

Crystallography of TelluroperiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 5.5649(6) Å, b = 5.5565(6) Å, c = 12.475(1) Å
Ratio:
a:b:c = 1.002 : 1 : 2.245
Unit Cell V:
385.74 ų (Calculated from Unit Cell)
Z:
2
Comment:
space group Bmmb

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.750(58)
2.857(100)
2.781(43)
2.075(31)
1.966(30)
1.665(21)
1.620(52)
1.250(17)

Type Occurrence of TelluroperiteHide

General Appearance of Type Material:
thin somewhat rounded square plates and flakes up to 0.25 mm on edge and 0.02 mm thick
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, catalog numbers 62513 and 62514.
Geological Setting of Type Material:
Oxidation zone, formed from the partial oxidation of primary sulfides (e.g., galena) and tellurides (e.g., hessite) during or following brecciation of the quartz veins.
Associated Minerals at Type Locality:

Synonyms of TelluroperiteHide

Fluorescence of TelluroperiteHide

Other InformationHide

Notes:
In dilute HCl acid, telluroperite immediately decomposes, turning white and opaque, and then dissolves slowly.
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 TelluroperiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A. R., Mills, S. J., Housley, R. M., Marty, J. & Thorne, B. (2010) Lead-tellurium oxysalts from Otto Mountain near Baker, California: VI. Telluroperite, Pb3Te4+O4Cl2, the Te analogue of perite and nadorite. American Mineralogist, 95(10), 1569–1573.
Christy, A. G. & Mills, S. J. (2013) Effect of lone-pair stereoactivity on polyhedral volume and structural flexibility: application to TeIVO6 octahedra. Acta Crystallographica, B69, 446–456.

Internet Links for TelluroperiteHide

Localities for TelluroperiteHide

ⓘ - 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
 
  • California
    • San Bernardino Co.
      • Silver Lake District
        • Soda Mts
          • Baker
            • Otto Mountain
In the collection of Brent Thorne.
IMA approvals - Sept. 2009; Kampf, A. R., Mills, S. J., Housley, R. M., Marty, J. & Thorne, B. (2010) Lead-tellurium oxysalts from Otto Mountain near Baker, California: VI. Telluroperite, Pb3Te4+O4Cl2, the Te analogue of perite and nadorite. American Mineralogist: 95(10): 1569–1573.
Collected by and in the collection of Brent Thorne. EDS analyzed by Bob Housley and PXRD analyzed by Tony Kampf.
Collected by and in the collection of Brent Thorne.
Mineral and/or Locality  
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