Fibroferrite Mineral Data

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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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 12.1(1), 2.98(0.8), 6.96(0.6),

Forms:

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

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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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Print or Cut-and-Paste your Fibroferrite Specimen Label here :

Fibroferrite

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

Notes: