Jachymovite Mineral Data

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General Jachymovite Information

Chemical Formula:

(UO2)8(SO4)(OH)14•13(H2O)

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

Empirical Formula:

(UO₂)₈(SO₄)(OH)₁₄•13(H₂O)

Environment:

Found in a dolomite-vein.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

Jachymov (St. Joachimsthal), Krusne Hory, Zapadocesky kraj, Cechy (Bohemia), Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Name Pronunciation:

Jachymovite + Pronunciation

Synonym:

IMA1994-025

Jachymovite Image

Images:

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

Axial Ratios:

a:b:c =2.0001:1:1.4588

Cell Dimensions:

a = 18.553, b = 9.276, c = 13.532, Z = 2; beta = 125.56° V = 1,894.52 Den(Calc)= 4.78

Crystal System:

MonoclinicSpace Group: P 2₁,P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.56(1), 7.13(0.48), 3.771(0.34),

Physical Properties of Jachymovite

Cleavage:

{010} Perfect

Color:

Yellow.

Density:

4.79

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Luster:

Vitreous (Glassy)

Optical Properties of Jachymovite

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

Optical Data:

Biaxial (-), a=1.715, b=1.718, g=1.72, bire=0.0050

Calculated Properties of Jachymovite

Electron Density:

Bulk Density (Electron Density)=4.10 gm/cc
note: Specific Gravity of Jachymovite =4.79 gm/cc.

Fermion Index:

Fermion Index = 0.0052473884
Boson Index = 0.9947526116

Photoelectric:

PE_Jachymovite=1,849.53 barns/electron
U=PE_Jachymovite x r_electron=7,584.60 barns/cc.

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

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

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

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.82,p207,1997) OPTIC PROP.(Am.Min.,Vol.82,p207,1997)

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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Jachymovite

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

Notes: