Mineralogy Database

Jachymovite Mineral Data

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General Jachymovite Information

Help on Chemical  Formula: Chemical Formula: (UO2)8(SO4)(OH)14•13(H2O)
Help on Composition: Composition: Molecular Weight = 2,728.59 gm
   Uranium   69.79 %  U    79.17 % UO2
   Hydrogen   1.48 %  H    13.20 % H2O
   Sulfur     1.18 %  S     2.93 % SO3
   Oxygen    27.56 %  O
            ______        ______ 
            100.00 %       95.31 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (UO2)8(SO4)(OH)14•13(H2O)
Help on Environment: Environment: Found in a dolomite-vein.
Help on IMA Status: IMA Status: Approved IMA 1997 (Dana # Added)
Help on Locality: Locality: Jachymov (St. Joachimsthal), Krusne Hory, Zapadocesky kraj, Cechy (Bohemia), Czech Republic. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Name Pronunciation: Name Pronunciation: Jachymovite + Pronunciation Say JACHYMOVITE
Help on Synonym: Synonym: IMA1994-025
 

Jachymovite Image

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  Jachymovite

Comments: Yellow crystals of jáchymovite.
Location: Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Jachymovite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.0001:1:1.4588
Help on Cell Dimensions: Cell Dimensions: a = 18.553, b = 9.276, c = 13.532, Z = 2; beta = 125.56° V = 1,894.52 Den(Calc)= 4.78
Help on Crystal System: Crystal System: Monoclinic Space Group: P 21,P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.56(1), 7.13(0.48), 3.771(0.34),
 

Physical Properties of Jachymovite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Yellow.
Help on Density: Density: 4.79
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Luster: Luster: Vitreous (Glassy)
 

Optical Properties of Jachymovite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.159 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.162 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1501,KPDmeas= 0.1498,KC= 0.1293
Ncalc = 1.62
Help on Optical Data: Optical Data: Biaxial (-), a=1.715, b=1.718, g=1.72, bire=0.0050
 

Calculated Properties of Jachymovite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.10 gm/cc
note: Specific Gravity of Jachymovite =4.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0052473884
Boson Index = 0.9947526116
Help on Photoelectric: Photoelectric: PEJachymovite =1,849.53 barns/electron
U=PEJachymovite x relectron=7,584.60 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 5,092,731.35 (Gamma Ray American Petroleum Institute Units)
Concentration of Jachymovite per GRapi unit = 196.36 (PPB)

Jachymovite 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) 5.97 ± 1.49 grams of pure Jachymovite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 597.26 ±149.31 grams of pure Jachymovite .

Estimated Radioactivity from Jachymovite - 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 / 7.36 cm 124,920,860 3.38E-03 5,092,731.35 1,674.32
100 gm / 3.42 cm 12,492,086 3.38E-04 509,273.14 167.43
10 gm / 1.59 cm 1,249,209 3.38E-05 50,927.31 16.74
1 gm / 7.36 mm 124,921 3.38E-06 5,092.73 1.67
0.1 gm / 3.42 mm 12,492 3.38E-07 509.27 0.17
0.01 gm / 1.59 mm 1,249 3.38E-08 50.93 0.02
0.001 gm / 0.74 mm 125 3.38E-09 5.09 0.00

Weight of pure Jachymovite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.79 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
 

Jachymovite Classification

Help on  Dana Class: Dana Class: 31.02.06.02 (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.02)where (A+ B++)6 (XO4) Zq�x(H2O)
  (31.02.06)Dana Group
 
31.02.06.01 Uranopilite [(UO2)6(SO4)O2(OH)6(H2O)6]•8(H2O) P1 1
 
31.02.06.02 Jachymovite! (UO2)8(SO4)(OH)14•13(H2O) P 21,P 21/m Mono
Help on  Strunz Class: Strunz Class: 07.EA.10 07 - SULFATES (SELENATES, TELLURATES)
  07.E - Uranyl Sulfates
  07.EA -Without cations
 
07.EA.10 Jachymovite! (UO2)8(SO4)(OH)14•13(H2O) P 21,P 21/m Mono
 

Other Jachymovite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.82,p207,1997) OPTIC PROP.(Am.Min.,Vol.82,p207,1997)
Help on See Also: See Also: Links to other databases for Jachymovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - Uranium Minerals

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

Jachymovite

(UO2)8(SO4)(OH)14•13(H2O)
Dana No: 31.02.06.02 Strunz No: 07.EA.10
Locality:

 

Notes:

 

 
   
 


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