Johannite Mineral Data

Johannite Mineral Data +

General Johannite Information

Chemical Formula:

Cu(UO2)2(SO4)2(OH)2·8(H2O)

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

Empirical Formula:

Cu(UO₂)₂(SO₄)₂(OH)₂·8(H₂O)

Environment:

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

IMA Status:

Valid Species (Pre-IMA) 1830

Locality:

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

Name Origin:

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

Synonym:

ICSD 17071

PDF 17-530

Johannite Image

Images:

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

Images:

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

Images:

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

Axial Ratios:

a:b:c =0.9301:1:0.7132

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

Crystal System:

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

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

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

Forms:

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Forms: [ 1 1 1] [ 1 1 0] [ 1 1 1] [ 1 0 0]

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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

Cleavage:

[100] Good

Color:

Yellow, Greenish yellow.

Density:

3.3 - 3.5, Average = 3.4

Diaphaniety:

Transparent to Translucent

Fracture:

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

Habit:

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

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

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

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

light green

Optical Properties of Johannite

Gladstone-Dale:

CI meas= -0.104 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.166 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1846,KPDmeas= 0.1748,KC= 0.1584

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

Electron Density:

r_electron=3.07 gm/cc
note: r_Johannite=3.40 gm/cc.

Fermion Index

Fermion Index = 0.00418
Boson Index = 0.99582

Photoelectric:

PE_Johannite=1,233.68 barns/electron
U=PE_Johannite x r_electron=3,781.61 barns/cc.

Radioactivity:

GRapi = 3,756,556.37 (Gamma Ray American Petroleum Institute Units)

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	3,756,556.37	1,235.03
100 gm / 3.83 cm	8,750,114	2.36E-04	375,655.64	123.50
10 gm / 1.78 cm	875,011	2.36E-05	37,565.56	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

Dana Class:

31.8.2.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.8)where (A+ B++)3 (XO4)2 Zq·x(H2O)

(31.8.2)Dana Group

31.8.2.1 Johannite Cu(UO2)2(SO4)2(OH)2·8(H2O) P1 1

31.8.2.2 Deliensite! Fe(UO2)2(SO4)2(OH)2·3(H2O) Pnnm or Pnn2 Ortho

Strunz Class:

VI/D.21-10 VI - Sulfates,Chromates,Molybdates and Tungstates

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

VI/D.21 - Johannite - Schröckingerite series

VI/D.21-10 Johannite Cu(UO2)2(SO4)2(OH)2·8(H2O) P1 1

VI/D.21-20 Schrockingerite NaCa3(UO2)(CO3)3(SO4)F·10(H2O) C mmm 2/m 2/m 2/m

VI/D.21-30 Marecottite! Mg3(H2O)18[(UO2)4O3(SO4)2]2·10(H2O) P1 1

Other Johannite Information

References:

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

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Johannite

Cu(UO2)2(SO4)2(OH)2·8(H2O)
Dana No: 31.8.2.1 Strunz No: VI/D.21-10
Locality:

Notes: