Tetra-ferri-annite Mineral Data

Tetra-ferri-annite Mineral Data

General Tetra-ferri-annite Information

Chemical Formula:

K(Fe++,Mg)3(Fe+++,Al)Si3O10(OH)2

Composition:

Molecular Weight = 517.76 gm

Potassium 7.55 % K 9.10 % K₂O

Magnesium 2.35 % Mg 3.89 % MgO

Aluminum 1.30 % Al 2.46 % Al₂O₃

Iron 35.06 % Fe 34.69 % FeO / 11.57 % Fe₂O₃

Silicon 16.27 % Si 34.81 % SiO₂

Hydrogen 0.39 % H 3.48 % H₂O

Oxygen 37.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KFe²⁺_2.5Mg_0.5Fe³⁺_0.75Al_0.25Si₃O₁₀(OH)₂

Environment:

Metamorphosed banded-iron formation.

IMA Status:

Renamed IMA 1998 Formerly ferri-annite

Locality:

Dales George member, Hammersley group, Wittenoom, WA, Australia. Link to MinDat.org Location Data.

Name Origin:

Named in 1963 for the composition and relationship to annite. Renamed to Tetra-ferri-annite.

Synonym:

Ferri-annite

Ferriannite

Ferribiotite

Monrepite

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Tetra-ferri-annite Crystallography

Axial Ratios:

a:b:c =0.5848:1:1.1157

Cell Dimensions:

a = 5.402, b = 9.237, c = 10.306, Z = 2; beta = 99.267° V = 507.54 Den(Calc)= 3.39

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): 10.159(1), 1.696(0.5), 3.684(0.5),3.379(0.5), 1.66(0.3), 1.539(0.1), 2.67(0.1), 2.91(0.1),

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Crystal Structure:

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Comodi P , Zanazzi P F , Weiss Z , Rieder M , Drabek M , American Mineralogist , 84 (1999) p.325-332, Cs-tetra-ferri-annite: High-pressure and high-temperature behavior of a, potential nuclear waste disposal phase, T = 23 deg C, P = .001 kbar, crystal 1

View Additional jPOWD Structure files for Tetra-ferri-annite
[1] [2] [3] [4] [5]

Physical Properties of Tetra-ferri-annite

Cleavage:

[001] Perfect

Color:

Brown, Brownish black.

Density:

2.7 - 3.4, Average = 3.05

Diaphaniety:

Transparent to Opaque

Habit:

Massive - Lamellar - Distinctly foliated fine-grained forms.

Habit:

Scaly - Morphology like fish scales.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous - Adamantine

Streak:

light brown

Optical Properties of Tetra-ferri-annite

Optical Data:

Biaxial (-), a=1.66, b=1.72, g=1.728, bire=0.0680

Calculated Properties of Tetra-ferri-annite

Electron Density:

r_electron=3.31 gm/cc
note: r_{Tetra-ferri-annite}=3.39 gm/cc.

Fermion Index

Fermion Index = 0.01756
Boson Index = 0.98244

Photoelectric:

PE_{Tetra-ferri-annite}= 11.93 barns/electron
U=PE_{Tetra-ferri-annite} x r_electron= 39.49 barns/cc.

Radioactivity:

GRapi = 106.37 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Tetra-ferri-annite - barely detectable

Tetra-ferri-annite Classification

Dana Class:

71.2.2b.4 (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.11-120 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 Tetra-ferri-annite Information

References:

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

See Also:

Links to other databases for Tetra-ferri-annite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST

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Tetra-ferri-annite

K(Fe++,Mg)3(Fe+++,Al)Si3O10(OH)2
Dana No: 71.2.2b.4 Strunz No: VIII/H.11-120
Locality:

Notes: