Ferripyrophyllite Mineral Data

Ferripyrophyllite Mineral Data +

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General Ferripyrophyllite Information

Chemical Formula:

Fe+++2Si4O10(OH)2

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

Empirical Formula:

Fe³⁺₂Si₄(OH)₂O₁₀

Environment:

Found on a museum specimen from the Strassenschacht hematite deposit.

IMA Status:

Approved IMA 1979

Locality:

Strassenschacht, Germany. Link to MinDat.org Location Data.

Name Origin:

Named as the Fe+++ analog of pyrophyllite.

Ferripyrophyllite Image

Images:

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

Axial Ratios:

a:b:c =0.578:1:2.0989

Cell Dimensions:

a = 5.26, b = 9.1, c = 19.1, Z = 4; beta = 95.5° V = 910.03 Den(Calc)= 3.05

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 4.54(1), 1.518(0.8), 9.6(0.8),

Physical Properties of Ferripyrophyllite

Cleavage:

[001] Perfect

Color:

Brownish yellow.

Density:

2.6 - 3, Average = 2.8

Diaphaniety:

Transparent to Translucent

Fracture:

Plastic - Deforms like soft, plastic materials.

Habit:

Scaly - Morphology like fish scales.

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Pearly

Streak:

light yellow

Optical Properties of Ferripyrophyllite

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

Optical Data:

Biaxial (?), b=1.676-1.678, g=1.686-1.688,

Pleochroism (x):

greenish.

Pleochroism (y):

greenish.

Pleochroism (z):

bright yellow.

Calculated Properties of Ferripyrophyllite

Electron Density:

r_electron=2.76 gm/cc
note: r_{Ferripyrophyllite}=2.80 gm/cc.

Fermion Index

Fermion Index = 0.01843
Boson Index = 0.98157

Photoelectric:

PE_{Ferripyrophyllite}= 8.95 barns/electron
U=PE_{Ferripyrophyllite} x r_electron= 24.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferripyrophyllite is Not Radioactive

Ferripyrophyllite Classification

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

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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: