Mineralogy Database

Fibroferrite Mineral Data

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General Fibroferrite Information

Help on Chemical  Formula: Chemical Formula: Fe+++(SO4)(OH)•5(H2O)
Help on Composition: Composition: Molecular Weight = 258.99 gm
   Iron      21.56 %  Fe   30.83 % Fe2O3
   Hydrogen   4.28 %  H    38.26 % H2O
   Sulfur    12.38 %  S    30.91 % SO3
   Oxygen    61.78 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+(SO4)(OH)•5(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1833
Help on Locality: Locality: Tierra Amarilla, Copiapo, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Latin, fibra, meaning "fibre" and ferrum, meaning "iron."
Help on Name Pronunciation: Name Pronunciation: Fibroferrite + Pronunciation Say FIBROFERRITE
Help on Synonym: Synonym: ICSD 100721
  PDF 38-481
  Stypticite
 

Fibroferrite Image

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  Fibroferrite

Comments: Tan-white, acicular crystals of fibroferrite on matrix.
Location: Lichtenberg Mine, Ronneburg U Deposit, Gera district, Thuringia, Germany. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Fibroferrite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.31633
Help on Cell Dimensions: Cell Dimensions: a = 24.12, c = 7.63, Z = 18; V = 3,844.24 Den(Calc)= 2.01
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.1(1), 2.98(0.8), 6.96(0.6),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 0) ( 0 1 1) ( 1 0 0) ( 0 0 1)

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Physical Properties of Fibroferrite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Green gray, Yellow green, White, Light green, Light yellow.
Help on Density: Density: 1.9
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Silky
Help on Streak: Streak: white
 

Optical Properties of Fibroferrite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2741,KPDmeas= 0.29,KC= 0.2819
Ncalc = 1.54 - 1.57
Help on Optical Data: Optical Data: Uniaxial (+), w=1.532, e=1.57, bire=0.0380.
 

Calculated Properties of Fibroferrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.06 gm/cc
note: Specific Gravity of Fibroferrite =2.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0058028744
Boson Index = 0.9941971256
Help on Photoelectric: Photoelectric: PEFibroferrite = 6.99 barns/electron
U=PEFibroferrite x rElectron Density= 14.42 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fibroferrite is Not Radioactive
 

Fibroferrite Classification

Help on  Dana Class: Dana Class: 31.09.12.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.09)where (A+ B++) (XO4) Zq�x(H2O)
  (31.09.12)Dana Group
 
31.09.12.01 Fibroferrite Fe(SO4)(OH)•5(H2O) R 3 3
Help on  Strunz Class: Strunz Class: 07.DC.15 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DC -With only medium-sized cations; chains of corner-sharing octahedra
 
07.DC.15 Fibroferrite Fe(SO4)(OH)•5(H2O) R 3 3
 

Other Fibroferrite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Fibroferrite :
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
15 - WWW-MINCRYST

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Fibroferrite

Fe+++(SO4)(OH)•5(H2O)
Dana No: 31.09.12.01 Strunz No: 07.DC.15
Locality:

 

Notes:

 

 
   
 


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