Metahohmannite Mineral Data

Metahohmannite Mineral Data
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General Metahohmannite Information

Help on Chemical Formula: Chemical Formula: Fe+++2[O(SO4)2]•4(H2O)
Help on Composition: Composition: Molecular Weight = 391.88 gm
   Iron      28.50 %  Fe   40.75 % Fe2O3
   Hydrogen   2.06 %  H    18.39 % H2O
   Sulfur    16.37 %  S    40.86 % SO3
   Oxygen    53.08 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+2(O)(SO4)2•4(H2O)
Help on Environment: Environment: Formed rapidly from the dehydration of hohmannite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1938
Help on Locality: Locality: Chuquicamata, Quetena, and Alcaparrosa, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the similarity to hohmannite, with a lower state of hydration.
Help on Name Pronunciation: Name Pronunciation: Metahohmannite + Pronunciation Say METAHOHMANNITE
 

Metahohmannite Image

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Metahohmannite   Hohmannite

Comments: Orange opaque prismatic microcrystals of hohmannite mixed with yellow metahohmanite.
Location: Chuquicamata, Antofagasta, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species
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Metahohmannite

Comments: Orange-yellow earthy massive metahohmannite with orange hohmannite.
Location: Quetena, Antofagasta, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metahohmannite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.752:1:0.7319
Help on Cell Dimensions: Cell Dimensions: a = 7.3484, b = 9.771, c = 7.1521, Z = 2; alpha = 91.684°, beta = 98.523°, gamma = 86.39° V = 506.63 Den(Calc)= 2.57
Help on Crystal System: Crystal System: Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.18(1), 2.49(0.7), 2.7(0.7),2.96(0.7), 3.28(0.7), 4.27(0.7), 7.04(0.6), 9.7(0.6),
Click Here for Large Metahohmannite Structure Window Crystal Structure:

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Scordari F , Ventruti G , Gualtieri A F , American Mineralogist , 89 (2004) p.265-370, The structure of metahohmannite, Fe2[O(SO4)2].4H2O,, by in situ synchrotron powder diffraction

 

Physical Properties of Metahohmannite

Help on Color: Color: Orange.
Help on Habit: Habit: Pulverulent - Forms a loose, poorly-coherent powdery mass.
Help on Streak: Streak: light yellow
 

Optical Properties of Metahohmannite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.065 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2803,KC= 0.2632
Ncalc = 1.68
Help on Optical Data: Optical Data: Biaxial (+), a=1.709, b=1.718, g=1.734, bire=0.0250, 2V(Calc)=76, 2V(Meas)=70.
Help on Pleochroism (x): Pleochroism (x): pale yellow.
Help on Pleochroism (y): Pleochroism (y): reddish yellow.
Help on Pleochroism (z): Pleochroism (z): reddish brown.
 

Calculated Properties of Metahohmannite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.57 gm/cc
note: Specific Gravity of Metahohmannite =2.57 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0075276504
Boson Index = 0.9924723496
Help on Photoelectric: Photoelectric: PEMetahohmannite = 9.35 barns/electron
U=PEMetahohmannite x rElectron Density= 24.04 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Metahohmannite is Not Radioactive
 

Metahohmannite Classification
Help on Dana Class: Dana Class: 31.09.05.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.09)where (A+ B++) (XO4) Zq·x(H2O)
  (31.09.05)Dana Group
 
31.09.05.01 Metahohmannite Fe2[O(SO4)2]•4(H2O) P1 1
Help on Strunz Class: Strunz Class: 07.DB.30 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DB -With only medium-sized cations; insular octahedra and finite groups
 
07.DB.30 Amarantite Fe(SO4)(OH)•3(H2O) P1 1
 
07.DB.30 Hohmannite Fe2(SO4)2(OH)2•7(H2O) P1 1
 
07.DB.30 Metahohmannite Fe2[O(SO4)2]•4(H2O) P1 1
 

Other Metahohmannite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990, AmMin, v 89, p 265) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Metahohmannite :
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

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Metahohmannite

Fe+++2[O(SO4)2]•4(H2O)
Dana No: 31.09.05.01 Strunz No: 07.DB.30
Locality:

 

Notes: