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About HolfertiteHide

CaxU6+2-xTi(O8-xOH4x) · 3H2O
Canary yellow to orange yellow
Specific Gravity:
Crystal System:
Named in honor of John W. Holfert (b. 1949), for his significant contributions to the mineralogy and geology of the Thomas Range, USA.
A hydrated Ca-U-Ti oxide/hydroxide.

May not be the same material per Foord from location.

Classification of HolfertiteHide

Approval Year:

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
B : With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra

Physical Properties of HolfertiteHide

Transparent, Translucent
Canary yellow to orange yellow
Pale yellow
Irregular/Uneven, Conchoidal
4.22 g/cm3 (Measured)    4.26 g/cm3 (Calculated)

Optical Data of HolfertiteHide

Uniaxial (+)
RI values:
nω = 1.815 nε = 1.910
Max Birefringence:
δ = 0.095
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of HolfertiteHide

CaxU6+2-xTi(O8-xOH4x) · 3H2O
IMA Formula:
(UO2)1.75Ca0.25TiO4 · 3H2O

Crystallography of HolfertiteHide

Crystal System:
Class (H-M):
3 - Pyramidal
Space Group:
Cell Parameters:
a = 10.824 Å, c = 7.549 Å
a:c = 1 : 0.697
Unit Cell V:
765.94 ų (Calculated from Unit Cell)
Hollow elongated prisms

Crystal StructureHide

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2x2x2 | 3x3x3 | 4x4x4
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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0006067HolfertiteSokolova E, Hawthorne F C, Belakovskiy D I, Pautov L A (2005) The OD (order-disorder) structure of holfertite, a hydrated uranyl titanate mineral from Searle Canyon, Thomas Range, Utah, USA The Canadian Mineralogist 43 1545-15522005Searle Canyon, Thomas Range, Utah, USA0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
From type description.

Type Occurrence of HolfertiteHide

General Appearance of Type Material:
Minute yellow, rod-like needles sparsely
Place of Conservation of Type Material:
Smithsonian Museum, Fersman Museum
Geological Setting of Type Material:
In vesicles in rhyolite.
Associated Minerals at Type Locality:

Synonyms of HolfertiteHide

Other Language Names for HolfertiteHide

Simplified Chinese:羟水钙钛铀石
Traditional Chinese:羥水鈣鈦鈾石

Common AssociatesHide

Associated Minerals Based on Photo Data:
19 photos of Holfertite associated with HematiteFe2O3
2 photos of Holfertite associated with QuartzSiO2
2 photos of Holfertite associated with AdulariaKAlSi3O8
1 photo of Holfertite associated with BixbyiteMn3+2O3

Related Minerals - Nickel-Strunz GroupingHide

4.GB.05AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2OOrth.
4.GB.05CompreignaciteK2(UO2)6O4(OH)6 · 7H2OOrth.
4.GB.05RameauiteK2Ca(UO2)6O6(OH)4 · 6H2OMon. m : Bb
4.GB.10BecquereliteCa(UO2)6O4(OH)6 · 8H2OOrth. mm2 : Pna21
4.GB.10BillietiteBa(UO2)6O4(OH)6 · 4-8H2OOrth. mm2
4.GB.10ProtasiteBa(UO2)3O3(OH)2 · 3H2OMon.
4.GB.15Richetite(Fe3+,Mg)Pb 8.6(UO2)36O36(OH)24 · 41H2O Tric.
4.GB.20BauranoiteBa(UO2)2(OH)6 · 1-2H2O
4.GB.20Calciouranoite(Ca,Ba,Pb)U2O7 · 5H2O
4.GB.20Metacalciouranoite(Ca,Ba,Pb,K2)U2O7 · 2H2O
4.GB.25FourmarieritePb(UO2)4O3(OH)4 · 4H2OOrth.
4.GB.30WölsendorfitePb7(UO2)14O19(OH)4 · 12H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
4.GB.35MasuyitePb(UO2)3O3(OH)2 · 3H2OOrth.
4.GB.40MetavandendriesscheitePbU7O22 · nH2O n < 12Orth.
4.GB.40VandendriesscheitePbU7O22 · 12H2OOrth. mmm (2/m 2/m 2/m) : Pbca
4.GB.45VandenbrandeiteCu(UO2)(OH)4Tric. 1 : P1
4.GB.50SayritePb2(UO2)5O6(OH)2 · 4H2OMon. 2/m
4.GB.55CuritePb3(H2O)2[(UO2)4O4(OH)3]2Orth. mmm (2/m 2/m 2/m) : Pnma
4.GB.60Iriginite(UO2)Mo2O7 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbcm
4.GB.65UranosphaeriteBi(UO2)O2(OH)Mon. 2/m

Fluorescence of HolfertiteHide

Other InformationHide

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 HolfertiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Foord, E.E., Chirnside, W., Davis, A.M., Lichte, F.E., Esposito, K.J. (1995) A new U–Ti–Ca–HREE hydrated oxide and associated niobian rutile from Topaz Valley, Utah. Mineralogical Record: 26: 122-128.
Belakovskiy, D.I. and Pautov, L.A. (2002) A new hydrous uranium titanate from Thomas Range, Utah, USA. International Mineralogical Association, 18th. General Meeting (Edinburgh): 135.
Sokolova, E., Hawthorne, F.C., Belakovskiy, D.I., Pautov, L.A. (2005) The OD (order–disorder) structure of holfertite, a hydrated uranyl titanate mineral from Searle Canyon, Thomas Range, Utah, USA. Canadian Mineralogist: 43: 1545-1552.
Ercit, T.S., Piilonen, P.C., Locock, A.J., Kolitsch, U., Rowe, R. (2006) New mineral names. American Mineralogist: 91: 1201-1209.
Belakovskiy, D.I., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Mokhov, A.V. (2006) Holfertite, a new mineral from Thomas Range, Utah, USA. Mineralogical Record: 37: 311-317.
Locock, A.J., Ercit, T.S., Kjellman, J., Piilonen, C. (2006) New mineral names. American Mineralogist: 91: 1945-1954.

Internet Links for HolfertiteHide

Localities for HolfertiteHide

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.
  • Utah
    • Juab Co.
      • Thomas Range
Min Rec (2006) 37:311-317; In the collection of Alex Earl
Min Rec (2006) 37:311-317
Min Rec (2006) 37:311-317
In the collection of Alex Earl
In the personal collection of Alex Earl
Mineral and/or Locality  
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