Fibroferrite Mineral Data

General Fibroferrite Information

Chemical Formula: Fe+++(SO4)(OH)•5(H2O) 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 Empirical Formula: Fe³⁺(SO₄)(OH)•5(H₂O) IMA Status: Valid Species (Pre-IMA) 1833 Locality: Tierra Amarilla, Copiapo, Chile. Link to MinDat.org Location Data. Name Origin: From the Latin, fibra, meaning "fibre" and ferrum, meaning "iron." Name Pronunciation: Fibroferrite + Pronunciation Synonym: ICSD 100721   PDF 38-481   Stypticite  

Fibroferrite Image

Images:

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

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

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Crystal Structure:

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Scordari F , Tschermaks Mineralogische und Petrographische Mitteilungen , 28 (1981) p.17-29, Fibroferrite: A mineral with a {Fe(OH)(H2O)2SO4} spiral chain and its, relationship to Fe(OH)SO4, butlerite and parabutlerite, Locality: Saint Felix de Pailleres, France

 

Physical Properties of Fibroferrite

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

Optical Properties of Fibroferrite

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 Optical Data: Uniaxial (+), w=1.532, e=1.57, bire=0.0380.  

Calculated Properties of Fibroferrite

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

Fibroferrite Classification

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

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

References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) 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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