Mineralogy Database

Holfertite Mineral Data

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General Holfertite Information

Help on Chemical  Formula: Chemical Formula: U++++++1.75TiCa0.25 O7.5(H2O)3
Help on Composition: Composition: Molecular Weight = 649.27 gm
   Potassium   0.24 %  K     0.29 % K2O
   Calcium     1.67 %  Ca    2.33 % CaO
   Uranium    63.79 %  U    76.65 % UO3
   Titanium    7.15 %  Ti   11.93 % TiO2
   Iron        0.34 %  Fe    0.49 % Fe2O3
   Hydrogen    0.93 %  H     8.32 % H2O
   Oxygen     25.87 %  O
             ______        ______ 
             100.00 %      100.02 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: U1.74Ti0.97Ca0.27Fe3+0.04K0.04O7.5•3(H2O)
Help on Environment: Environment: Found on hematite and topaz crystals in cavities and fractures in rhyolite.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Starvation Canyon (Searles Canyon), Thomas Range, Juab Co., Utah, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John W. Holfert, claim holder at Starvation (formerly Searle) Canyon.
Help on Synonym: Synonym: IMA2003-009
 

Holfertite Image

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  Holfertite

Comments: Yellow prismatic micro crystal of holfertite on clear topaz.
Location: Starvation Canyon, Topaz Valley, Juab Co., Utah, USA. Scale: Crystal size 0.5 mm.
© Tom Loomis / Dakota Matrix

Holfertite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.69743
Help on Cell Dimensions: Cell Dimensions: a = 10.824, c = 7.549, Z = 3; V = 765.94 Den(Calc)= 4.22
Help on Crystal System: Crystal System: Trigonal - Pyramidal H-M Symbol (3) Space Group: P 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.6(1), 2.9(0.8), 1.87(0.3),1.747(0.3), 1.211(0.3),
 

Physical Properties of Holfertite

Help on Cleavage: Cleavage: {110} Perfect
Help on Color: Color: Canary yellow, Orange yellow.
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow
 

Optical Properties of Holfertite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.184 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2044,KC= 0.1727
Ncalc = 1.73
Help on Optical Data: Optical Data: Uniaxial (+), w=1.815, e=1.91, bire=0.0950.
 

Calculated Properties of Holfertite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.62 gm/cc
note: Specific Gravity of Holfertite =4.22 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEHolfertite =1,687.98 barns/electron
U=PEHolfertite x relectron=6,113.57 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,666,583.92 (Gamma Ray American Petroleum Institute Units)
Concentration of Holfertite per GRapi unit = 214.29 (PPB)

Holfertite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 6.52 ± 1.63 grams of pure Holfertite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 651.80 ±162.95 grams of pure Holfertite .

Estimated Radioactivity from Holfertite - very strong
Specimen
Size
Weight/Volume
(Sphere)
*
Calculated
Activity
Bequerols
(Bq)
Calculated
Activity
Curies (Ci)
Estimated
Activity
GR(api)
Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 7.68 cm 114,183,715 3.09E-03 4,666,583.92 1,534.22
100 gm / 3.56 cm 11,418,372 3.09E-04 466,658.39 153.42
10 gm / 1.65 cm 1,141,837 3.09E-05 46,665.84 15.34
1 gm / 7.68 mm 114,184 3.09E-06 4,666.58 1.53
0.1 gm / 3.56 mm 11,418 3.09E-07 466.66 0.15
0.01 gm / 1.65 mm 1,142 3.09E-08 46.67 0.02
0.001 gm / 0.77 mm 114 3.09E-09 4.67 0.00

Weight of pure Holfertite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.22 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
 

Holfertite Classification

Help on  Dana Class: Dana Class: 05.02.04.01 (05)Oxides Containing Uranium and Thorium
  (05.02)with a cation charge of 6+ (AO3) and hydrated
  (05.02.04)Dana Group
 
05.02.04.01 Holfertite! U1.75TiCa0.25O7.5(H2O)3 P 3 3
Help on  Strunz Class: Strunz Class: 04.GB.70 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.G - Uranyl Hydroxides
  04.GB -With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra
 
04.GB.70 Holfertite! U1.75TiCa0.25O7.5(H2O)3 P 3 3
 

Other Holfertite Information

Help on References: References: NAME( AmMin, v91, p1204) PHYS. PROP.(AmMin, v91, p1204) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Holfertite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Holfertite Specimen Label here :

Holfertite

U++++++1.75TiCa0.25 O7.5(H2O)3
Dana No: 05.02.04.01 Strunz No: 04.GB.70
Locality:

 

Notes:

 

 
   
 


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