Pseudojohannite Mineral Data

[On-Line Catalogue] [On-Line Auctions] [eBay] [Contact Us] [Policies]
We specialize in fine European and Asian Mineral Specimens
Heliodor is based in Prague, Czech Republic

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 Musonoï (sample MGL 54110). (AmMin, v91, p930).
Location: Musonoï 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 Bequerols (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 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Pseudojohannite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Pseudojohannite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Pseudojohannite Mineral Data :

Ask about Pseudojohannite 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 Español

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: