Siderophyllite Mineral Data

Siderophyllite Mineral Data +

General Siderophyllite Information

Chemical Formula:

KFe++2Al(Al2Si2)O10(F,OH)2

Composition:

Molecular Weight = 484.90 gm

Potassium 8.06 % K 9.71 % K₂O

Aluminum 16.69 % Al 31.54 % Al₂O₃

Iron 23.03 % Fe 29.63 % FeO

Silicon 11.58 % Si 24.78 % SiO₂

Hydrogen 0.10 % H 0.93 % H₂O

Oxygen 34.64 % O

Fluorine 5.88 % F 5.88 % F

- % F -2.47 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KFe²⁺₂Al₃Si₂O₁₀F_1.5(OH)_0.5

Environment:

In pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1880

Locality:

Pikes Peak, Park County, Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "iron" and "leaf" in allusion to the composition and the micaceous character.

Siderophyllite Image

Images:

Siderophyllite

Comments: Micaceous siderophyllite with quartz.
Location: Karaoba, Aktjubinsk, Kazakhstan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Siderophyllite Crystallography

Axial Ratios:

a:b:c =0.5774:1:1.1044

Cell Dimensions:

a = 5.369, b = 9.297, c = 10.268, Z = 2; beta = 100.06° V = 504.65 Den(Calc)= 3.19

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): 3.367(1), 10.2(1), 2.644(0.8),

Forms:

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Crystal Structure:

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Brigatti M F , Lugli C , Poppi L , Foord E E , Kile D E , American Mineralogist , 85 (2000) p.1275-1286, Crystal chemical variations in Li- and Fe-rich micas from, Pikes Peak batholith (central Colorado), sample: 140(2)

View Additional jPOWD Structure files for Siderophyllite
[1] [2] [3] [4] [5] [6] [7] [8]

Physical Properties of Siderophyllite

Cleavage:

[001] Perfect

Color:

Blue green, Dark brown, Black.

Density:

Diaphaniety:

Transparent to Subopaque

Habit:

Foliated - Two dimensional platy forms.

Habit:

Micaceous - Platy texture with "flexible" plates.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Dull

Streak:

greenish gray

Optical Properties of Siderophyllite

Gladstone-Dale:

CI meas= -0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1914,KPDmeas= 0.2036,KC= 0.1975

Optical Data:

Biaxial (-), a=1.582, b=1.625, g=1.625, bire=0.0430, 2V(Calc)=0, 2V(Meas)=4.

Pleochroism (x):

brown.

Pleochroism (y):

dark brown.

Pleochroism (z):

dark brown.

Calculated Properties of Siderophyllite

Electron Density:

r_electron=3.11 gm/cc
note: r_{Siderophyllite}=3.19 gm/cc.

Fermion Index

Fermion Index = 0.01046
Boson Index = 0.98954

Photoelectric:

PE_{Siderophyllite}= 8.66 barns/electron
U=PE_{Siderophyllite} x r_electron= 26.90 barns/cc.

Radioactivity:

GRapi = 113.24 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Siderophyllite - barely detectable

Siderophyllite Classification

Dana Class:

71.2.2b.5 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.2b)Mica Group (Biotite subgroup)

71.2.2b.1 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

71.2.2b.1a Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

71.2.2b.1b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

71.2.2b.2 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m

71.2.2b.3 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

71.2.2b.3a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

71.2.2b.4 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

71.2.2b.5 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

71.2.2b.5a Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

71.2.2b.6 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

71.2.2b.7 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono

71.2.2b.8 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

71.2.2b.8a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

71.2.2b.8b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono

71.2.2b.9 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

71.2.2b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

71.2.2b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

71.2.2b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

71.2.2b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

71.2.2b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m

71.2.2b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

71.2.2b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

71.2.2b.17 IMA2004-049! NaMg3(AlSi3)O10(OH)2 C 2/m 2/m

Strunz Class:

VIII/H.11-160 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups

VIII/H.11 - Mica group, Biotite series

VIII/H.11-00* Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

VIII/H.11-10 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

VIII/H.11-20 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

VIII/H.11-30 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

VIII/H.11-35 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m

VIII/H.11-40 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

VIII/H.11-50 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

VIII/H.11-60 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

VIII/H.11-70 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

VIII/H.11-80 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

VIII/H.11-90 Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

VIII/H.11-100 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

VIII/H.11-102 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

VIII/H.11-105 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

VIII/H.11-110 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

VIII/H.11-120 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

VIII/H.11-130 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

VIII/H.11-140 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

VIII/H.11-150 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

VIII/H.11-160 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

Other Siderophyllite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Siderophyllite

KFe++2Al(Al2Si2)O10(F,OH)2
Dana No: 71.2.2b.5 Strunz No: VIII/H.11-160
Locality:

Notes: