Metahohmannite Mineral Data + Say METAHOHMANNITE


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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.
 

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
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
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:

relectron=2.57 gm/cc
note: rMetahohmannite =2.57 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00752
Boson Index = 0.99248
Help on Photoelectric: Photoelectric:

PEMetahohmannite = 9.35 barns/electron
U=PEMetahohmannite x relectron= 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: 31.9.5.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.9)where (A+ B++) (XO4) Zq·x(H2O)
  (31.9.5)Dana Group
 
31.9.5.1 Metahohmannite Fe2[O(SO4)2]·4(H2O) P1 1
Help on  Strunz Class: Strunz Class: VI/D.01-10 VI - Sulfates,Chromates,Molybdates and Tungstates
  VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size
  VI/D.01 - Metahohmannite - Xitieshanite series
 
VI/D.01-10 Metahohmannite Fe2[O(SO4)2]·4(H2O) P1 1
 
VI/D.01-20 Butlerite Fe(SO4)(OH)·2(H2O) P 21/m 2/m
 
VI/D.01-30 Parabutlerite Fe(SO4)(OH)·2(H2O) Pmnb 2/m 2/m 2/m
 
VI/D.01-40 Amarantite Fe(SO4)(OH)·3(H2O) P1 1
 
VI/D.01-50 Hohmannite Fe2(SO4)2(OH)2·7(H2O) P1 1
 
VI/D.01-60 Fibroferrite Fe(SO4)(OH)·5(H2O) R 3 3
 
VI/D.01-70 Xitieshanite Fe(SO4)(OH)·7(H2O) P 21/a 2/m
 

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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Metahohmannite

Fe+++2[O(SO4)2]·4(H2O)
Dana No: 31.9.5.1 Strunz No: VI/D.01-10
Locality:

 

Notes:

 

 
   
 
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