Jachymovite Mineral Data

Jachymovite Mineral Data +

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.

Synonym:

IMA1994-025

Jachymovite Image

Images:

Jachymovite

Comments: Yellow crystals of j?chymovite.
Location: J?chymov (St Joachimsthal), Krusn? Hory (Erzgebirge), Z?padocesk? 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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Jachymovite

Electron Density:

r_electron=4.10 gm/cc
note: r_Jachymovite=4.79 gm/cc.

Fermion Index

Fermion Index = 0.00524
Boson Index = 0.99476

Photoelectric:

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

Radioactivity:

GRapi = 5,092,729.55 (Gamma Ray American Petroleum Institute Units)

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	124,920,842	3.38E-03	5,092,729.55	1,674.32
100 gm / 3.42 cm	12,492,084	3.38E-04	509,272.96	167.43
10 gm / 1.59 cm	1,249,208	3.38E-05	50,927.30	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:

31.2.6.2 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.2)where (A+ B++)6 (XO4) Zq·x(H2O)

(31.2.6)Dana Group

31.2.6.1 Uranopilite [(UO2)6(SO4)O2(OH)6(H2O)6]·8(H2O) P1 1

31.2.6.2 Jachymovite ! (UO2)8(SO4)(OH)14·13(H2O) P 2₁,P 2₁/m Mono

Strunz Class:

VI/D.20-05 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Uranylsulfates [UO2]4+ - [SO4]2-

VI/D.20 - Uranopilite - Rabejacite series

VI/D.20-05 Jachymovite (UO2)8(SO4)(OH)14·13(H2O) P 2₁,P 2₁/m Mono

VI/D.20-10 Uranopilite [(UO2)6(SO4)O2(OH)6(H2O)6]·8(H2O) P1 1

VI/D.20-20 Meta-uranopilite (UO2)6(SO4)(OH)10·5(H2O) Unk Ortho

VI/D.20-30 Sodium-zippeite Na4(UO2)6(SO4)3(OH)10·4(H2O) Unk Ortho

VI/D.20-40 Zippeite K4(UO2)6(SO4)3(OH)10·4(H2O) C 2/m 2/m

VI/D.20-50 Magnesium-zippeite Mg(H2O)3.5(UO2)2(SO4)O2 C 2/m 2/m

VI/D.20-60 Cobalt-zippeite Co2(UO2)6(SO4)3(OH)10·16(H2O) Unk Ortho

VI/D.20-70 Nickel-zippeite Ni2(UO2)6(SO4)3(OH)10·16(H2O) Unk Ortho

VI/D.20-80 Zinc-zippeite Zn2(UO2)6(SO4)3(OH)10·16(H2O) Unk Ortho

VI/D.20-85 Deliensite! Fe(UO2)2(SO4)2(OH)2·3(H2O) Pnnm or Pnn2 Ortho

VI/D.20-90 Rabejacite Ca(UO2)4(SO4)2(OH)6·6(H2O) Unk Ortho

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - 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: 31.2.6.2 Strunz No: VI/D.20-05
Locality:

Notes: