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Cliffordite

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Clifford Frondel
Formula:
UTe34+O9
System:
Isometric
Colour:
Bright sulfur Yellow
Lustre:
Adamantine
Hardness:
4
Name:
Named by Richard V. Gaines in 1969 in honor of Clifford Frondel (8 January 1907, Brooklyn, New York, New York, USA - 12 November 2002, Winchester, Massachusetts, USA), American mineralogist, Professor of Mineralogy, Harvard University, Cambridge, Massachusetts, USA. The mineral frondelite is also named in his honor.
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

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.

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

IMA Formula:
UTe34+O9
Elements listed in formula:

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.

Occurrences of Cliffordite

Type Occurrence of Cliffordite

Place of Conservation of Type Material:
Harvard University, Boston Massachusetts 119079
Empirical Formula:
U6+Te34+O9

Relationship of Cliffordite to other Species

4.JK.05WinstanleyiteTiTe34+O8
4.JK.05Walfordite(Fe3+,Te6+,Ti4+,Mg)Te34+O8
4.JK.10SpiroffiteMn22+Te34+O8
4.JK.10ZincospiroffiteZn2Te3O8
4.JK.15BalyakiniteCu2+Te4+O3
4.JK.20RajiteCuTe24+O5
4.JK.25CarlfriesiteCaTe6+Te24+O8
4.JK.30DenningiteCaMn2+Te44+O10
4.JK.35ChekhovichiteBi23+Te44+O11
4.JK.40SmirniteBi23+Te4+O5
4.JK.45Choloalite(Pb,Ca)3(Cu,Sb)3Te6O18Cl
4.JK.50FairbankitePbTe4+O3
4.JK.55PlumbotelluritePbTe4+O3
4.JK.60MagnoliteHg21+Te4+O3
4.JK.65MoctezumitePb(UO2)(Te4+O3)2
4.JK.70Schmitterite(UO2)Te4+O3
28.3.1BalyakiniteCu2+Te4+O3
28.3.2RajiteCuTe24+O5
28.3.3GraemiteCu2+Te4+O3 · H2O
28.3.4TeineiteCu2+Te4+O3 · 2H2O
28.3.5CesbroniteCu5(Te4+O3)2(OH)6 · 2H2O
28.3.6MroseiteCaTe4+O2(CO3)
28.3.7QuetzalcoatliteCu32+Zn6Te26+O12(OH)6 · (Ag,Pb,◻)Cl
28.3.8ZemanniteMg0.5ZnFe3+(Te4+O3)3 · 4.5H2O
28.3.9KinichiliteMg0.5Mn2+Fe3+(Te4+O3)3 · 4.5H2O
28.3.10DenningiteCaMn2+Te44+O10
28.3.11SpiroffiteMn22+Te34+O8
28.3.12WinstanleyiteTiTe34+O8
28.3.13FairbankitePbTe4+O3
28.3.14PlumbotelluritePbTe4+O3
28.3.15Choloalite(Pb,Ca)3(Cu,Sb)3Te6O18Cl
28.3.16SmirniteBi23+Te4+O5
28.3.17ChekhovichiteBi23+Te44+O11
28.3.19Schmitterite(UO2)Te4+O3
28.3.20MoctezumitePb(UO2)(Te4+O3)2
28.3.21EmmonsiteFe23+(Te4+O3)3 · 2H2O
28.3.22BlakeiteFe23+(Te4+O3)3
28.3.23MackayiteFe3+Te24+O5(OH)
28.3.24PoughiteFe23+(Te4+O3)2SO4 · 3H2O
28.3.25SonoraiteFe3+Te4+O3(OH) · H2O
28.3.26RodalquilariteH3Fe23+(Te4+O3)4Cl
28.3.27EztlitePb2Fe63+(Te4+O3)3(Te6+O6)(OH)10 · 8H2O
28.3.28KeystoneiteH0.8Mg0.8(Ni,Fe3+,Mn)2(Te4+O3)3 · 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:
Gaines, R.V. (1969) Cliffordite–a new tellurite mineral from Moctezuma, Sonora, Mexico. American Mineralogist: 54: 697-701.

Fleischer, M. (1972) New mineral names. American Mineralogist: 57: 594-598.

Galy, J., 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

mindat.org URL:
https://www.mindat.org/min-1064.html
Please feel free to link to this page.

Localities for Cliffordite

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.
(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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