Mineralogy Database

Karibibite Mineral Data

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General Karibibite Information

Help on Chemical  Formula: Chemical Formula: Fe+++2As+++4(O,OH)9
Help on Composition: Composition: Molecular Weight = 556.38 gm
   Iron      20.08 %  Fe   28.70 % Fe2O3
   Arsenic   53.86 %  As   71.12 % As2O3
   Hydrogen   0.18 %  H     1.62 % H2O
   Oxygen    25.88 %  O
            ______        ______ 
            100.00 %      101.44 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+2As4O8(OH)
Help on Environment: Environment: In vugs in loellingite.
Help on IMA Status: IMA Status: Approved IMA 1973
Help on Locality: Locality: Karibib lithium pegmatite, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Karibibite + Pronunciation Say KARIBIBITE

Karibibite Image

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Comments: Orange yellow, radial sprays of karibibite on löllingite to 0.75mm.
Location: Galileia, Minas Gerais, Brazil. Scale: picture size 5 mm.
© Tom Loomis / Dakota Matrix

Karibibite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =4.2741:1:1.1026
Help on Cell Dimensions: Cell Dimensions: a = 27.91, b = 6.53, c = 7.2, Z = 6; V = 1,312.22 Den(Calc)= 4.22
Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.384(1), 2.808(0.8), 3.176(0.8),

Physical Properties of Karibibite

Help on Color: Color: Brownish yellow.
Help on Density: Density: 4.07
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luminescence: Luminescence: Fluorescent, Short UV=yellow.
Help on Magnetism: Magnetism: Paramagnetic
Help on Streak: Streak: light yellow

Optical Properties of Karibibite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2496,KPDmeas= 0.2588,KC= 0.263
Ncalc = 2.07 - 2.11
Help on Optical Data: Optical Data: Biaxial (-), a=1.96, b=2.1, g=2.1, bire=0.1400
Help on Pleochroism (x): Pleochroism (x): straw yellow.
Help on Pleochroism (y): Pleochroism (y): straw yellow.
Help on Pleochroism (z): Pleochroism (z): light brownish yellow.

Calculated Properties of Karibibite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.76 gm/cc
note: Specific Gravity of Karibibite =4.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0043804028
Boson Index = 0.9956195972
Help on Photoelectric: Photoelectric: PEKaribibite = 44.01 barns/electron
U=PEKaribibite x rElectron Density= 165.47 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Karibibite is Not Radioactive

Karibibite Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.10)Dana Type
  (07.10.02)Dana Group Karibibite Fe2As4(O,OH)9 Unk Ortho
Help on  Strunz Class: Strunz Class: 04.JA.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JA -Arsenites, antimonites, bismuthites; without additional anions, without H2O
04.JA.15 Karibibite Fe2As4(O,OH)9 Unk Ortho

Other Karibibite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Karibibite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 04.JA.15





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