Johannite Mineral Data (original) (raw)

General Johannite Information

Help on Chemical Formula: Chemical Formula:

Cu(UO2)2(SO4)2(OH)2•8(H2O)

Help on Composition: Composition:

Molecular Weight = 973.87 gm

Uranium 48.88 % U 55.45 % UO2

Copper 6.53 % Cu 7.35 % Cu2O

Hydrogen 1.86 % H 16.65 % H2O

Sulfur 6.59 % S 16.44 % SO3

Oxygen 36.14 % O

______ ______

100.00 % 95.89 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Cu(UO2)2(SO4)2(OH)2•8(H2O)

Help on Environment: Environment:

Formed from the oxidation of uraninite usually in the presence of gypsum.

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1830

Help on Locality: Locality:

Jachymov, Bohemia, Czech Republic. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for Archduke Johann (1782-1859) of Austria, fornder of the Styrian Landsmuseum ing Graz.

Help on Name Pronunciation: Name Pronunciation:

Johannite + Pronunciation Say JOHANNITE

Help on Synonym: Synonym:

ICSD 17071

PDF 17-530

Johannite Image

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Click Here for Larger Johannite Image in a New Browser Window Images:

Click Here for Larger Johannite Image Johannite Uranopilite Comments: Bright yellow rosettes of uranopilite with pale greenish yellow johannite on matrix. Location: Apex Mine, Lander Co., Nevada, USA.Scale: Picture size 0.5 cm. © Paul M. Schumacher

Click Here for Larger Johannite Image in a New Browser Window Images:

Click Here for Larger Johannite Image Johannite Uranopilite Comments: Green aggregates of minute, acicular johannite and yellow uranopilite and clear, tabular aragonite crystals on matrix. Location: Apex Mine, Lander Co., Nevada, USA.Scale: Picture size 1.5 cm. © Paul M. Schumacher

Johannite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.9301:1:0.7132

Help on Cell Dimensions: Cell Dimensions:

a = 8.92, b = 9.59, c = 6.84, Z = 1; alpha = 110°, beta = 111.983°, gamma = 100.3° V = 501.63 Den(Calc)= 3.22

Help on Crystal System: Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 7.73(1), 6.16(0.9), 3.41(0.8),

Help on Forms: Forms:

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| | Forms:( 1 1 1) ( 1 1 0) ( 1 1 1) ( 1 0 0) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Click Here for Large Johannite Structure Window Crystal Structure:

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| | Mereiter K , Tschermaks Mineralogische und Petrographische Mitteilungen , 30 (1982) p.47-57, Die kristallstruktur des johannits, Cu(UO2)2(OH)2(SO4)2*8H2O, Locality: Joachimsthal, Czech Republic | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Johannite

Help on Cleavage: Cleavage:

{100} Good

Help on Color: Color:

Yellow, Greenish yellow.

Help on Density: Density:

3.3 - 3.5, Average = 3.4

Help on Diaphaneity: Diaphaneity:

Transparent to Translucent

Help on Fracture: Fracture:

Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.

Help on Habit: Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Help on Habit: Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Help on Habit: Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Help on Hardness: Hardness:

2 - Gypsum

Help on Luminescence: Luminescence:

Non-fluorescent.

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

light green

Optical Properties of Johannite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= -0.104 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.107 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1753,KPDmeas= 0.1748,KC= 0.1584
Ncalc = 1.52 - 1.55

Help on Optical Data: Optical Data:

Biaxial (+/-), a=1.572-1.577, b=1.592-1.597, g=1.612-1.616, bire=0.0390-0.0400, 2V(Calc)=86-88, 2V(Meas)=90. Dispersion relatively strong.

Calculated Properties of Johannite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=3.07 gm/cc
note: Specific Gravity of Johannite =3.40 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.004189779
Boson Index = 0.995810221

Help on Photoelectric: Photoelectric:

PEJohannite =1,233.68 barns/electron
U=PEJohannite x relectron=3,781.61 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 3,756,556.78 (Gamma Ray American Petroleum Institute Units)
Concentration of Johannite per GRapi unit = 266.20 (PPB)

Johannite 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) 8.10 ± 2.02 grams of pure Johannite .
Estimated Maximum U.S. Postal Shipping Size(10 mRem/hr limit, Unshielded 100 cm box) 809.70 ±202.42 grams of pure Johannite .

Estimated Radioactivity from Johannite - very strong

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor One Hour
1000 gm / 8.25 cm 87,501,143 2.36E-03 3,756,556.78 1,235.03
100 gm / 3.83 cm 8,750,114 2.36E-04 375,655.68 123.50
10 gm / 1.78 cm 875,011 2.36E-05 37,565.57 12.35
1 gm / 8.25 mm 87,501 2.36E-06 3,756.56 1.24
0.1 gm / 3.83 mm 8,750 2.36E-07 375.66 0.12
0.01 gm / 1.78 mm 875 2.36E-08 37.57 0.01
0.001 gm / 0.83 mm 88 2.36E-09 3.76 0.00

Weight of pure Johannite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.40 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

Johannite Classification

Help on Dana Class: Dana Class:

31.08.02.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.08)where (A+ B++)3 (XO4)2 Zq�x(H2O)

(31.08.02)Dana Group

31.08.02.01 Johannite Cu(UO2)2(SO4)2(OH)2•8(H2O) P1 1

31.08.02.02 Deliensite! Fe(UO2)2(SO4)2(OH)2•3(H2O) Pnnm or Pnn2 Ortho

Help on Strunz Class: Strunz Class:

07.EB.05 07 - SULFATES (SELENATES, TELLURATES)

07.E - Uranyl Sulfates

07.EB -With medium-sized cations

07.EB.05 Johannite Cu(UO2)2(SO4)2(OH)2•8(H2O) P1 1

Other Johannite Information

Help on References: References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

Help on See Also: See Also:

Links to other databases for Johannite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals
16 - WWW-MINCRYST

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Ask about Johannite 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 Espa�ol

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

Johannite

Cu(UO2)2(SO4)2(OH)2•8(H2O)
Dana No: 31.08.02.01 Strunz No: 07.EB.05
Locality:

Notes: