Cafetite Mineral Data

Cafetite Mineral Data
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General Cafetite Information

Help on Chemical Formula: Chemical Formula: Ca(Fe,Al)2Ti4O12•4(H2O)
Help on Composition: Composition: Molecular Weight = 592.91 gm
   Calcium    6.76 %  Ca    9.46 % CaO
   Titanium  32.30 %  Ti   53.89 % TiO2
   Aluminum   2.28 %  Al    4.30 % Al2O3
   Iron      14.13 %  Fe   18.18 % FeO
   Hydrogen   1.36 %  H    12.15 % H2O
   Oxygen    43.18 %  O
            ______        ______ 
            100.00 %       97.98 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaFe2+1.5Al0.5Ti4O12•4(H2O)
Help on Environment: Environment: In miarolitic cavities in pegmatites cutting pyroxenite. Later work suggests that Fe was a contaminent from magnetite and not an essential part of the formula.
Help on IMA Status: IMA Status: Approved IMA 1959
Help on Locality: Locality: Afrikanda massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition (Ca, Fe, Ti).
Help on Name Pronunciation: Name Pronunciation: Cafetite Say CAFETITE
 

Cafetite Image

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Cafetite

Comments: Ocher-colored aggregates of cafetite in pegmatite, intimately mixed with iron hydroxides.
Location: Mount Rasvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Cafetite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.4084:1:1.3139
Help on Cell Dimensions: Cell Dimensions: a = 4.9463, b = 12.109, c = 15.911, Z = 3; beta = 98.937° V = 941.42 Den(Calc)= 3.14
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.86(1), 2.56(0.8), 1.91(0.7),
Click Here for Large Cafetite Structure Window Crystal Structure:

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 Help on Above


Krivovichev S V , Yakovenchuk V N , Burns P C , Pakhomovsky Y A , Menshikov Y P , American Mineralogist , 88 (2003) p.424-429, Cafetite, Ca[Ti2O5](H2O): Crystal structure and revision of chemical formula

 

Physical Properties of Cafetite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Colorless, Pale yellow.
Help on Density: Density: 3.28
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white
 

Optical Properties of Cafetite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3333,KPDmeas= 0.3191,KC= 0.316
Ncalc = 1.99 - 2.04
Help on Optical Data: Optical Data: Biaxial (-), a=1.95, b=2.08, g=2.11, bire=0.1600, 2V(Calc)=48, 2V(Meas)=38.
 

Calculated Properties of Cafetite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.20 gm/cc
note: Specific Gravity of Cafetite =3.28 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PECafetite = 10.44 barns/electron
U=PECafetite x rElectron Density= 33.44 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cafetite is Not Radioactive
 

Cafetite Classification
Help on Dana Class: Dana Class: 08.07.03.01 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.07)Dana Type
  (08.07.03)Dana Group
 
08.07.03.01 Cafetite Ca(Fe,Al)2Ti4O12•4(H2O) P 21/n 2/m
Help on Strunz Class: Strunz Class: 04.FL.75 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FL -Hydroxides with H2O ± (OH); sheets of edge-sharing octahedra
 
04.FL.75 Cafetite Ca(Fe,Al)2Ti4O12•4(H2O) P 21/n 2/m
 

Other Cafetite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(AmMin, Vol 88, p 424) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Cafetite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Cafetite

Ca(Fe,Al)2Ti4O12•4(H2O)
Dana No: 08.07.03.01 Strunz No: 04.FL.75
Locality:

 

Notes: