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Johannite Mineral Data

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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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  Johannite

Comments: Green colored johannite crystals.
Location: Happy Jack mine, White Canyon, San Juan County, Utah, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Uranopilite   Johannite

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

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  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 - Pinacoidal H-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:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 1 1 0) ( 1 1 1) ( 1 0 0)

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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
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 / 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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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:

 

 
   
 


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