Mineralogy Database

Ferripyrophyllite Mineral Data

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General Ferripyrophyllite Information

Help on Chemical  Formula: Chemical Formula: Fe+++2Si4O10(OH)2
Help on Composition: Composition: Molecular Weight = 418.04 gm
   Iron      26.72 %  Fe   38.20 % Fe2O3
   Silicon   26.87 %  Si   57.49 % SiO2
   Hydrogen   0.48 %  H     4.31 % H2O
   Oxygen    45.93 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+2Si4(OH)2O10
Help on Environment: Environment: Found on a museum specimen from the Strassenschacht hematite deposit.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Strassenschacht, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Fe+++ analog of pyrophyllite.
Help on Name Pronunciation: Name Pronunciation: Ferripyrophyllite + Pronunciation Say FERRIPYROPHYLLITE

Ferripyrophyllite Image

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Comments: Brown crystal prism of ferripyrophyllite in earthy matrix.
Location: Talagai, Kazakhstan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferripyrophyllite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.578:1:2.0989
Help on Cell Dimensions: Cell Dimensions: a = 5.26, b = 9.1, c = 19.1, Z = 4; beta = 95.5° V = 910.03 Den(Calc)= 3.05
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.54(1), 1.518(0.8), 9.6(0.8),

Physical Properties of Ferripyrophyllite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Brownish yellow.
Help on Density: Density: 2.6 - 3, Average = 2.8
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Plastic - Deforms like soft, plastic materials.
Help on Habit: Habit: Scaly - Morphology like fish scales.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Pearly
Help on Streak: Streak: light yellow

Optical Properties of Ferripyrophyllite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.122 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2236,KPDmeas= 0.2436,KC= 0.2546
Ncalc = 1.66 - 1.78
Help on Optical Data: Optical Data: Biaxial (?), b=1.676-1.678, g=1.686-1.688,
Help on Pleochroism (x): Pleochroism (x): greenish.
Help on Pleochroism (y): Pleochroism (y): greenish.
Help on Pleochroism (z): Pleochroism (z): bright yellow.

Calculated Properties of Ferripyrophyllite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.76 gm/cc
note: Specific Gravity of Ferripyrophyllite =2.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEFerripyrophyllite = 8.95 barns/electron
U=PEFerripyrophyllite x rElectron Density= 24.70 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ferripyrophyllite is Not Radioactive

Ferripyrophyllite Classification

Help on  Dana Class: Dana Class: (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.02)with 2:1 Layers
  (71.02.01)Pyrophyllite-talc group Pyrophyllite Al2Si4O10(OH)2 P1 1 Ferripyrophyllite Fe2Si4O10(OH)2 C 2/m 2/m Talc Mg3Si4O10(OH)2 C 2/c 2/m Willemseite (Ni,Mg)3Si4O10(OH)2 C 2/c 2/m Minnesotaite (Fe,Mg)3Si4O10(OH)2 C1 1 Brinrobertsite! (Na,K,Ca)x(Al,Fe,Mg)4(Si,Al)8O20(OH)4•3.54(H2O)[x=0.35,n=3.54] pseudo 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.EC.10 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
09.EC.10 Ferripyrophyllite Fe2Si4O10(OH)2 C 2/m 2/m
09.EC.10 Pyrophyllite Al2Si4O10(OH)2 P1 1

Other Ferripyrophyllite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Ferripyrophyllite :
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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Dana No: Strunz No: 09.EC.10





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