Mineralogy Database

Tetraferriannite Mineral Data

Search Webmineral :
  
Advertisment

General Tetraferriannite Information

Help on Chemical  Formula: Chemical Formula: K(Fe++,Mg)3(Fe+++,Al)Si3O10(OH)2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: KFe2+2.5Mg0.5Fe3+0.75Al0.25Si3O10(OH)2
Help on Environment: Environment: Metamorphosed banded-iron formation.
Help on IMA Status: IMA Status: Renamed IMA 1998 Formerly ferri-annite
Help on Locality: Locality: Dales George member, Hammersley group, Wittenoom, WA, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1963 for the composition and relationship to annite. Renamed to Tetra-ferri-annite.
Help on Synonym: Synonym: Ferri-annite
  Ferriannite
  Ferribiotite
  Monrepite
  Tetra-ferri-annite - Renamed Tetraferriannite by Mineralogical Record, v39 (2008), p131
 

Tetraferriannite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Tetraferriannite

Comments: Brownish black crystal fragment of tetraferriannite showing the micaceous cleavage.
Location: Bancroft District, Hastings Co., Ontario, Canada. Scale: Sample Size 1 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Tetraferriannite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5848:1:1.1157
Help on Cell Dimensions: Cell Dimensions: a = 5.402, b = 9.237, c = 10.306, Z = 2; beta = 99.267° V = 507.54 Den(Calc)= 3.39
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): 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),
 

Physical Properties of Tetraferriannite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Brown, Brownish black.
Help on Density: Density: 2.7 - 3.4, Average = 3.05
Help on Diaphaneity: Diaphaneity: Transparent to Opaque
Help on Habit: Habit: Massive - Lamellar - Distinctly foliated fine-grained forms.
Help on Habit: Habit: Scaly - Morphology like fish scales.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: light brown
 

Optical Properties of Tetraferriannite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.064 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2073,KPDmeas= 0.2304,KC= 0.2166
Ncalc = 1.58 - 1.74
Help on Optical Data: Optical Data: Biaxial (-), a=1.66, b=1.72, g=1.728, bire=0.0680
 

Calculated Properties of Tetraferriannite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.31 gm/cc
note: Specific Gravity of Tetraferriannite =3.39 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETetraferriannite = 11.93 barns/electron
U=PETetraferriannite x relectron= 39.49 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 106.37 (Gamma Ray American Petroleum Institute Units)
Concentration of Tetraferriannite per GRapi unit = 0.94 (%)

Estimated Radioactivity from Tetraferriannite - barely detectable

 

Tetraferriannite Classification

Help on  Dana Class: Dana Class: 71.02.02b.04 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.02)with 2:1 Layers
  (71.02.02b)Mica Group (Biotite subgroup)
 
71.02.02b.01 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m
 
71.02.02b.01a Tetraferriphlogopite! KMg3FeSi3O10(OH)2 2/m
 
71.02.02b.01b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m
 
71.02.02b.01c Fluorophlogopite! KMg3(AlSi3)O10F2 C 2/m 2/m
 
71.02.02b.02 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m
 
71.02.02b.03 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m
 
71.02.02b.03a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m
 
71.02.02b.04 Tetraferriannite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m
 
71.02.02b.05 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m
 
71.02.02b.05a Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m
 
71.02.02b.06 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m
 
71.02.02b.07 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono
 
71.02.02b.08 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m
 
71.02.02b.08a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m
 
71.02.02b.08b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono
 
71.02.02b.09 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m
 
71.02.02b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m
 
71.02.02b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m
 
71.02.02b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m
 
71.02.02b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m
 
71.02.02b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m
 
71.02.02b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m
 
71.02.02b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m
 
71.02.02b.18 Suhailite! (NH4)Fe3(Si3Al)O10(OH)2 C 2/m? 2/m
Help on  Strunz Class: Strunz Class: 09.EC.20 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
 
09.EC.20 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m
 
09.EC.20 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m
 
09.EC.20 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m
 
09.EC.20 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m
 
09.EC.20 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m
 
09.EC.20 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono
 
09.EC.20 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m
 
09.EC.20 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m
 
09.EC.20 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m
 
09.EC.20 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m
 
09.EC.20 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m
 
09.EC.20 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m
 
09.EC.20 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m
 
09.EC.20 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m
 
09.EC.20 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m
 
09.EC.20 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m
 
09.EC.20 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m
 
09.EC.20 Tetraferriannite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m
 
09.EC.20 Tetraferriphlogopite! KMg3FeSi3O10(OH)2 2/m
 
09.EC.20 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m
 
09.EC.20 Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono
 
09.EC.20 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m
 
09.EC.20 Suhailite! (NH4)Fe3(Si3Al)O10(OH)2 C 2/m? 2/m
 
09.EC.20 Fluorophlogopite! KMg3(AlSi3)O10F2 C 2/m 2/m
 

Other Tetraferriannite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Tetraferriannite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Tetraferriannite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Tetraferriannite :

Ask about Tetraferriannite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Tetraferriannite Specimen Label here :

Tetraferriannite

K(Fe++,Mg)3(Fe+++,Al)Si3O10(OH)2
Dana No: 71.02.02b.04 Strunz No: 09.EC.20
Locality:

 

Notes:

 

 
   
 


Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.