Ferripyrophyllite Mineral Data + Say FERRIPYROPHYLLITE

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.
 

Ferripyrophyllite Image

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Ferripyrophyllite

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 - PrismaticH-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 Diaphaniety: Diaphaniety: 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
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:

relectron=2.76 gm/cc
note: rFerripyrophyllite =2.80 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01843
Boson Index = 0.98157
Help on Photoelectric: Photoelectric:

PEFerripyrophyllite = 8.95 barns/electron
U=PEFerripyrophyllite x relectron= 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: 71.2.1.2 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.2)with 2:1 Layers
  (71.2.1)Pyrophyllite-talc group
 
71.2.1.1 Pyrophyllite Al2Si4O10(OH)2 P1 1
 
71.2.1.2 Ferripyrophyllite Fe2Si4O10(OH)2 C 2/m 2/m
 
71.2.1.3 Talc Mg3Si4O10(OH)2 C 2/c 2/m
 
71.2.1.4 Willemseite (Ni,Mg)3Si4O10(OH)2 C 2/c 2/m
 
71.2.1.5 Minnesotaite (Fe,Mg)3Si4O10(OH)2 C1 1
 
71.2.1.6 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: VIII/H.09-20 VIII - Silicates
  VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups
  VIII/H.09 - Talc series
 
VIII/H.09-10 Pyrophyllite Al2Si4O10(OH)2 P1 1
 
VIII/H.09-20 Ferripyrophyllite Fe2Si4O10(OH)2 C 2/m 2/m
 
VIII/H.09-30 Macaulayite (Fe,Al)24Si4O43(OH)2 C? Mono
 
VIII/H.09-40 Talc Mg3Si4O10(OH)2 C 2/c 2/m
 
VIII/H.09-50 Minnesotaite (Fe,Mg)3Si4O10(OH)2 C1 1
 
VIII/H.09-60 Willemseite (Ni,Mg)3Si4O10(OH)2 C 2/c 2/m
 
VIII/H.09-65 Pimelite Ni3Si4O10(OH)2·4(H2O) Unk. Hex
 
VIII/H.09-70 Kegelite Pb8Al4Si8O20(SO4)2(CO3)4(OH)8 A2/m,A2,Am Mono
 

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 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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Ferripyrophyllite

Fe+++2Si4O10(OH)2
Dana No: 71.2.1.2 Strunz No: VIII/H.09-20
Locality:

 

Notes:

 

 
   
 
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