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Cliffordite

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Formula:
(UO2)Te34+O7
System:
Isometric
Colour:
Bright sulfur Yellow
Lustre:
Adamantine
Hardness:
4
Name:
For Clifford Frondel (1907-2002), Harvard University, Massachusetts
This page provides mineralogical data about Cliffordite.

Classification of Cliffordite

Approved
4.JK.75

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
K : Tellurites without additional anions, without H2O
34.3.1.1

34 : SELENITES, TELLURITES AND SULFITES
3 : A2(XO3)3·xH2O
28.3.18

28 : Selenites, Selenates, Tellurites, and Tellurates
3 : Tellurites
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Type Occurrence of Cliffordite

Place of Conservation of Type Material:
Harvard University, Boston Massachusetts 119079
Year of Discovery:
1969

Occurrences of Cliffordite

Geological Setting:
Oxidized zones of hydrothermal Au-Ag telluride deposits.

Physical Properties of Cliffordite

Adamantine
Diaphaneity (Transparency):
Translucent
Colour:
Bright sulfur Yellow
Hardness (Mohs):
4
Density:
6.57 g/cm3 (Measured)    6.77 g/cm3 (Calculated)
Comment:
On synthetic material.

Crystallography of Cliffordite

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Pa3
Cell Parameters:
a = 11.42(5) Å
Unit Cell Volume:
V 1,489.36 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Octahedra crystals, crusts.

Optical Data of Cliffordite

Type:
Isotropic
RI values:
n = 2.25(2)
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:
Very High
Comments:
On synthetic material

Chemical Properties of Cliffordite

Formula:
(UO2)Te34+O7
Essential elements:
All elements listed in formula:
Empirical Formula:
U6+Te34+O9

Relationship of Cliffordite to other Species

4.JK.05WinstanleyiteTiTe34+O8
4.JK.05Walfordite(Fe3+,Te6+)Te34+O8
4.JK.10Spiroffite(Mn,Zn)2Te34+O8
4.JK.10ZincospiroffiteZn2Te34+O8
4.JK.15BalyakiniteCu(TeO3)
4.JK.20RajiteCu(Te24+O5)
4.JK.25CarlfriesiteCaTe24+Te6+O8
4.JK.30Denningite(Mn2+,Ca,Zn)Te24+O5
4.JK.35ChekhovichiteBi2Te44+O11
4.JK.40SmirniteBi2Te4+O5
4.JK.45Choloalite(Cu,Sb)3(Pb,Ca)3(TeO3)6Cl
4.JK.50FairbankitePb(TeO3)
4.JK.55PlumbotelluritePb(TeO3)
4.JK.60Magnolite(Hg2+)(Te4+O3)
4.JK.65MoctezumitePb(UO2)(TeO3)2
4.JK.70Schmitterite(UO2)(TeO3)
28.3.1BalyakiniteCu(TeO3)
28.3.2RajiteCu(Te24+O5)
28.3.3GraemiteCu[TeO3] · H2O
28.3.4TeineiteCu[TeO3] · 2H2O
28.3.5CesbroniteCu5(TeO3)2(OH)6 · 2H2O
28.3.6MroseiteCaTe4+(CO3)O2
28.3.7QuetzalcoatliteZn6Cu3(TeO6)2(OH)6 · AgxPbyClx+2y
28.3.8ZemanniteMg(ZnFe)2(TeO3)6·9H2O
28.3.9Kinichilite(Fe,Mg,Zn)2(TeO3)3(NaxH2-x) · 3H2O
28.3.10Denningite(Mn2+,Ca,Zn)Te24+O5
28.3.11Spiroffite(Mn,Zn)2Te34+O8
28.3.12WinstanleyiteTiTe34+O8
28.3.13FairbankitePb(TeO3)
28.3.14PlumbotelluritePb(TeO3)
28.3.15Choloalite(Cu,Sb)3(Pb,Ca)3(TeO3)6Cl
28.3.16SmirniteBi2Te4+O5
28.3.17ChekhovichiteBi2Te44+O11
28.3.19Schmitterite(UO2)(TeO3)
28.3.20MoctezumitePb(UO2)(TeO3)2
28.3.21EmmonsiteFe23+[TeO3]3 · 2H2O
28.3.22BlakeiteFe23+[TeO3]3 (?)
28.3.23MackayiteFe3+(Te24+O5)(OH)
28.3.24PoughiteFe23+(TeO3)2(SO4)(H2O)2 · H2O
28.3.25SonoraiteFe3+(TeO3)(OH) · H2O
28.3.26RodalquilariteFe2(TeO2OH)3(TeO3)Cl
28.3.27EztlitePb2Fe63+(Te4+O3)3(Te6+O6)(OH)10 · 8H2O
28.3.28Keystoneite(Ni,Mg,Fe,Mn)3Te3O9 · 5H2O

Other Names for Cliffordite

Name in Other Languages:

Other Information

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 Cliffordite

Reference List:
American Mineralogist: 54: 697-701.

American Mineralogist: 57: 597.

Galy, J., and Meunier, G. (1971): A propos de la cliffordite UTe3O8. Le système UO3–TeO2 à 700°C. Structure cristalline de UTe3O9. Acta Crystallographica B27(3), 608-616 (in French).

Brandstätter, F. (1981): Non-stoichiometric, hydrothermally synthesized cliffordite. Tschermaks Mineralogische und Petrographische Mitteilungen 29, 1-8.

Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Internet Links for Cliffordite

Localities for Cliffordite

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.
Mexico
 
  • Sonora
    • Mun. de Moctezuma
      • Moctezuma
Lapis 2001(1), 11-40
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
Amer.Min.(1969) 54, 697-701
Lapis 2001(1), 11-40
Mineral and/or Locality  
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