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Holfertite

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Formula:
CaxU6+2-xTi(O8-xOH4x) · 3H2O
Colour:
Canary yellow to orange yellow
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
4.22
Crystal System:
Trigonal
Name:
For John W. Holfert
A hydrated Ca-U-Ti oxide/hydroxide.

May not be the same material per Foord from location.


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Classification of HolfertiteHide

Approved
Approval Year:
2003
4.GB.70

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

Vitreous
Transparency:
Transparent, Translucent
Colour:
Canary yellow to orange yellow
Streak:
Pale yellow
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
(110)
Fracture:
Irregular/Uneven, Conchoidal
Density:
4.22 g/cm3 (Measured)    4.26 g/cm3 (Calculated)

Optical Data of HolfertiteHide

Type:
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
Pleochroism:
Non-pleochroic

Chemical Properties of HolfertiteHide

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

Crystallography of HolfertiteHide

Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Space Group:
P3
Cell Parameters:
a = 10.824 Å, c = 7.549 Å
Ratio:
a:c = 1 : 0.697
Unit Cell V:
765.94 ų (Calculated from Unit Cell)
Z:
3
Morphology:
Hollow elongated prisms

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.60(100)
2.90(80)
1.87(30)
1.747(30)
1.211(30)
Comments:
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 Rhyolite
Associated Minerals at Type Locality:

Synonyms of HolfertiteHide

Other Language Names for HolfertiteHide

German:Holfertit
Simplified Chinese:羟水钙钛铀石
Spanish:Holfertita
Traditional Chinese:羥水鈣鈦鈾石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hematite19 photos of Holfertite associated with Hematite on mindat.org.
Quartz2 photos of Holfertite associated with Quartz on mindat.org.
Adularia2 photos of Holfertite associated with Adularia on mindat.org.
Bixbyite1 photo of Holfertite associated with Bixbyite on mindat.org.

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(H[3]2O)(H[5]2O)4[(UO2)6O6(OH)4](H[4]2O)Mon. 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 · 12H2O
4.GB.45VandenbrandeiteCu(UO2)(OH)4Tric. 1 : P1
4.GB.50SayritePb2(UO2)5O6(OH)2 · 4H2OMon.
4.GB.55CuritePb3(UO2)8O8(OH)6 · 3H2OOrth. 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.
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.

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.
USA
 
  • 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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