Jachymovite Mineral Data

[How the Club Works] [Memberships - Junior, Deluxe , and Platinum] [FAQ] [Past Minerals]
Join the Club - Junior, Deluxe and Platinum Memberships Available
High Quality Minerals Sent to Your Home or School Each Month
Mineral of the Month Club - An Inexpensive Way to Enjoy Minerals

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 - Google Images
4 - Google Scholar
5 - Handbook of Mineralogy (MinSocAm)
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - Uranium Minerals

Search for Jachymovite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Jachymovite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Jachymovite Mineral Data :

Ask about Jachymovite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: