Pseudojohannite Mineral Data

General Pseudojohannite Information

Chemical Formula:

Cu6.5[(UO2)4O4(SO4)2]2(OH)5•25H2O

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 %

Empirical Formula:

Cu_6.52U_7.85S_4.02O₇₀H_55.74

Environment:

Peudojohannite and other divalent zippeites are common, easily overlooked minerals in acid drainage environments around uranium deposits and wastes.

IMA Status:

Approved IMA 2000 (Dana # Added)

Locality:

Jáchymov (St. Joachimsthal), Northern Bohemia, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named for the (almost) relationship by composition with johannite.

Synonym:

IMA2000-019

Pseudojohannite Image

Images:

Pseudojohannite

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

Pseudojohannite Crystallography

Axial Ratios:

a:b:c =0.9265:1:1.2378

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

Crystal System:

TriclinicSpace Group: P1 or P1

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

By Intensity(I/I_o): 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

Cleavage:

Very Good

Color:

Olive gray, Moss green.

Density:

4.31

Diaphaneity:

Nearly opaque

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Luster:

Vitreous (Glassy)

Optical Properties of Pseudojohannite

Optical Data:

Biaxial (+), a=1.725, g=1.74, bire=0.0150

Calculated Properties of Pseudojohannite

Electron Density:

Bulk Density (Electron Density)=3.85 gm/cc
note: Specific Gravity of Pseudojohannite =4.34 gm/cc.

Fermion Index:

Fermion Index = 0.0041713039
Boson Index = 0.9958286961

Photoelectric:

PE_{Pseudojohannite}=1,337.74 barns/electron
U=PE_{Pseudojohannite} x r_electron=5,150.08 barns/cc.

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
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr 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

Dana Class:

31.10.04.08 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.10)miscellaneous

(31.10.04)Zippeite Group

31.10.04.01 Zippeite K4(UO2)6(SO4)3(OH)10•4(H2O) C 2/m 2/m

31.10.04.02 Natrozippeite Na4(UO2)6(SO4)3(OH)10•4(H2O) Unk Ortho

31.10.04.03 Magnesiozippeite Mg(H2O)3.5(UO2)2(SO4)O2 C 2/m 2/m

31.10.04.04 Nickelzippeite Ni2(UO2)6(SO4)3(OH)10•16(H2O) Unk Ortho

31.10.04.05 Zinc-zippeite Zn2(UO2)6(SO4)3(OH)10•16(H2O) Unk Ortho

31.10.04.06 Cobaltzippeite Co2(UO2)6(SO4)3(OH)10•16(H2O) Unk Ortho

31.10.04.07 Marecottite! Mg3(H2O)18[(UO2)4O3(SO4)2]2•10(H2O) P1 1

31.10.04.08 Pseudojohannite! Cu6.5[(UO2)4O4(SO4)2]2(OH)5•25H2O P1 or P1 Tri

31.10.04.09 IMA2009-008 Y2[(UO2)8O6(SO4)4(OH)2]•26H2O P1 1

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

References:

NAME( AmMin, v91, p929) PHYS. PROP.(AmMin, v91, p929) OPTIC PROP.(AmMin, v91, p929)

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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Ask about Pseudojohannite here :
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Print or Cut-and-Paste your Pseudojohannite Specimen Label here :

Pseudojohannite

Cu6.5[(UO2)4O4(SO4)2]2(OH)5•25H2O
Dana No: 31.10.04.08 Strunz No: 07.EC.20
Locality:

Notes: