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Gatumbaite Mineral Data

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General Gatumbaite Information

Help on Chemical  Formula: Chemical Formula: CaAl2(PO4)2(OH)2•(H2O)
Help on Composition: Composition: Molecular Weight = 336.01 gm
   Calcium     11.93 %  Ca   16.69 % CaO
   Aluminum    16.06 %  Al   30.34 % Al2O3
   Phosphorus  18.44 %  P    42.24 % P2O5
   Hydrogen     1.20 %  H    10.72 % H2O
   Oxygen      52.38 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaAl2(PO4)2(OH)2•(H2O)
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Buranga pegmatite, near Gatumba, Gisenyi Province, Rwanda. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Gatumbaite + Pronunciation Say GATUMBAITE

Gatumbaite Image

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  Gatumbaite   Apatite-(CaF)

Comments: White crystalline gatumbaite with yellow brazilianite in massive blue fluorapatite.
Location: Buranga Pegmatite, near Gatumba, Gisenyi, Rwanda. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Burangaite   Gatumbaite

Comments: Small, blue burangaite crystals in beige gatumbaite.
Location: Horrsjoberg, Torby, Värmland, Sweden. Scale: Micro-mount Size.
© Sonke Stolze / Systematic Minerals

Gatumbaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3556:1:2.1126
Help on Cell Dimensions: Cell Dimensions: a = 6.907, b = 5.095, c = 10.764, Z = 2; beta = 91.05° V = 378.73 Den(Calc)= 2.95
Help on Crystal System: Crystal System: Monoclinic Space Group: P12/m,P 2,Pm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.241(1), 4.21(1), 1.726(0.75),

Physical Properties of Gatumbaite

Help on Cleavage: Cleavage: {???} Good, {???} Good
Help on Color: Color: White.
Help on Density: Density: 2.92
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Splintery - Brittle fracture leaving splintery fragments.
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Habit: Habit: Scaly - Morphology like fish scales.
Help on Habit: Habit: Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Pearly
Help on Streak: Streak: white

Optical Properties of Gatumbaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2123,KPDmeas= 0.2145,KC= 0.2116
Ncalc = 1.62
Help on Optical Data: Optical Data: Biaxial (-), a=1.61, b=1.63, g=1.639, bire=0.0290, 2V(Calc)=66, 2V(Meas)=65.

Calculated Properties of Gatumbaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.95 gm/cc
note: Specific Gravity of Gatumbaite =2.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0004142297
Boson Index = 0.9995857703
Help on Photoelectric: Photoelectric: PEGatumbaite = 2.83 barns/electron
U=PEGatumbaite x rElectron Density= 8.35 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gatumbaite is Not Radioactive

Gatumbaite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.12)Gatumbaite Group Gatumbaite CaAl2(PO4)2(OH)2•(H2O) P12/m,P 2,Pm Mono Kleemanite ZnAl2(PO4)2(OH)2•3(H2O) P 2, P 21, P 2/m or P 21/m Mono
Help on  Strunz Class: Strunz Class: 08.DJ.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DJ -With large and medium-sized cations, (OH, etc.):RO4 = 1:l
08.DJ.10 Gatumbaite CaAl2(PO4)2(OH)2•(H2O) P12/m,P 2,Pm Mono

Other Gatumbaite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Gatumbaite :
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: 08.DJ.10





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