Mineralogy Database

Pseudojohannite Mineral Data

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General Pseudojohannite Information

Help on Chemical  Formula: Chemical Formula: Cu6.5[(UO2)4O4(SO4)2]2(OH)5•25H2O
Help on Composition: Composition: Molecular Weight = 3,587.89 gm
   Uranium   52.08 %  U
   Copper    11.55 %  Cu
   Hydrogen   1.57 %  H
   Sulfur     3.59 %  S
   Oxygen    31.21 %  O
            100.00 % 
Help on Empirical Formula: Empirical Formula: Cu6.52U7.85S4.02O70H55.74
Help on Environment: Environment: Peudojohannite and other divalent zippeites are common, easily overlooked minerals in acid drainage environments around uranium deposits and wastes.
Help on IMA Status: IMA Status: Approved IMA 2000 (Dana # Added)
Help on Locality: Locality: J�chymov (St. Joachimsthal), Northern Bohemia, Czech Republic. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the (almost) relationship by composition with johannite.
Help on Synonym: Synonym: IMA2000-019

Pseudojohannite Image

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Comments: SEM microphotograph of prismatic, tabular, pseudojohannite crystals from Musonoï (sample MGL 54110). (AmMin, v91, p930).
Location: Musonoï quarry near Kolwezi (Shaba, Congo). Scale: Picture Size 50 µm.
© American Mineralogist

Pseudojohannite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9265:1:1.2378
Help on Cell Dimensions: Cell Dimensions: a = 10.027, b = 10.822, c = 13.396, Z = 1; alpha = 87.97°, beta = 109.2°, gamma = 90.89° V = 1,371.75 Den(Calc)= 4.34
Help on Crystal System: Crystal System: Triclinic Space Group: P1 or P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.13(1), 4.566(0.8), 3.046(0.26),7.09(0.26), 5.511(0.22), 3.443(0.17), 3.367(0.15),

Physical Properties of Pseudojohannite

Help on Cleavage: Cleavage: Very Good
Help on Color: Color: Olive gray, Moss green.
Help on Density: Density: 4.31
Help on Diaphaneity: Diaphaneity: Nearly opaque
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Pseudojohannite

Help on Optical Data: Optical Data: Biaxial (+), a=1.725, g=1.74, bire=0.0150

Calculated Properties of Pseudojohannite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.85 gm/cc
note: Specific Gravity of Pseudojohannite =4.34 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0041713039
Boson Index = 0.9958286961
Help on Photoelectric: Photoelectric: PEPseudojohannite =1,337.74 barns/electron
U=PEPseudojohannite x relectron=5,150.08 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 3,937,741.19 (Gamma Ray American Petroleum Institute Units)
Concentration of Pseudojohannite per GRapi unit = 253.95 (PPB)

Pseudojohannite 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) 7.72 ± 1.93 grams of pure Pseudojohannite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 772.44 ±193.11 grams of pure Pseudojohannite .

Estimated Radioactivity from Pseudojohannite - very strong
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 7.61 cm 93,220,823 2.52E-03 3,937,741.19 1,294.60
100 gm / 3.53 cm 9,322,082 2.52E-04 393,774.12 129.46
10 gm / 1.64 cm 932,208 2.52E-05 39,377.41 12.95
1 gm / 7.61 mm 93,221 2.52E-06 3,937.74 1.29
0.1 gm / 3.53 mm 9,322 2.52E-07 393.77 0.13
0.01 gm / 1.64 mm 932 2.52E-08 39.38 0.01
0.001 gm / 0.76 mm 93 2.52E-09 3.94 0.00

Weight of pure Pseudojohannite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.34 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

Pseudojohannite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.10.04)Zippeite Group Zippeite K4(UO2)6(SO4)3(OH)10•4(H2O) C 2/m 2/m Natrozippeite Na4(UO2)6(SO4)3(OH)10•4(H2O) Unk Ortho Magnesiozippeite Mg(H2O)3.5(UO2)2(SO4)O2 C 2/m 2/m Nickelzippeite Ni2(UO2)6(SO4)3(OH)10•16(H2O) Unk Ortho Zinc-zippeite Zn2(UO2)6(SO4)3(OH)10•16(H2O) Unk Ortho Cobaltzippeite Co2(UO2)6(SO4)3(OH)10•16(H2O) Unk Ortho Marecottite! Mg3(H2O)18[(UO2)4O3(SO4)2]2•10(H2O) P1 1 Pseudojohannite! Cu6.5[(UO2)4O4(SO4)2]2(OH)5•25H2O P1 or P1 Tri IMA2009-008 Y2[(UO2)8O6(SO4)4(OH)2]•26H2O P1 1
Help on  Strunz Class: Strunz Class: 07.EC.20 07 - SULFATES (SELENATES, TELLURATES)
  07.E - Uranyl Sulfates
  07.EC -With medium-sized and large cations
07.EC.20 Pseudojohannite! Cu6.5[(UO2)4O4(SO4)2]2(OH)5•25H2O P1 or P1 Tri

Other Pseudojohannite Information

Help on References: References: NAME( AmMin, v91, p929) PHYS. PROP.(AmMin, v91, p929) OPTIC PROP.(AmMin, v91, p929)
Help on See Also: See Also: Links to other databases for Pseudojohannite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 07.EC.20





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