Gatumbaite Mineral Data + 
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- 42.11.12.1 Gatumbaite CaAl2(PO4)2(OH)2·(H2O) P12/m,P 2,Pm Mono
- 42.11.12.2 Kleemanite ZnAl2(PO4)2(OH)2·3(H2O) P 2, P 21, P 2/m or P 21/m Mono
- VII/D.36-10 Kovdorskite Mg5(PO4)2(CO3)(OH)2·4.5(H2O) P 21/c 2/m
- VII/D.36-20 Camgasite CaMg(AsO4)(OH)·5(H2O) P 21/m 2/m
- VII/D.36-30 Isoclasite Ca2(PO4)(OH)·2(H2O)(?) Mono
- VII/D.36-40 Gatumbaite CaAl2(PO4)2(OH)2·(H2O) P12/m,P 2,Pm Mono
General Gatumbaite Information |
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 Chemical Formula: |
CaAl2(PO4)2(OH)2·(H2O) | ||
| 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 | |||
| Empirical Formula: |
CaAl2(PO4)2(OH)2·(H2O) | ||
| IMA Status: |
Approved IMA 1977 | ||
| Locality: |
Buranga pegmatite, near Gatumba, Gisenyi Province, Rwanda. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the locality. | ||
Gatumbaite Image | |||
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Images:
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Gatumbaite Crystallography |
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| Axial Ratios: |
a:b:c =1.3556:1:2.1126 | ||
| Cell Dimensions: |
a = 6.907, b = 5.095, c = 10.764, Z = 2; beta = 91.05° V = 378.73 Den(Calc)= 2.95 | ||
| Crystal System: |
MonoclinicSpace Group: P12/m,P 2,Pm | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.241(1), 4.21(1), 1.726(0.75), | ||
Physical Properties of Gatumbaite |
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| Cleavage: |
[???] Good, [???] Good | ||
| Color: |
White. | ||
| Density: |
2.92 | ||
| Diaphaniety: |
Translucent | ||
| Fracture: |
Brittle - Splintery - Brittle fracture leaving splintery fragments. | ||
| Habit: |
Rosette - Bundled tabular aggregates resembling rose flower petals. | ||
| Habit: |
Scaly - Morphology like fish scales. | ||
| Habit: |
Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat. | ||
| Hardness: |
4-5 - Fluorite-Apatite | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Pearly | ||
| Streak: |
white | ||
Optical Properties of Gatumbaite |
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| 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 |
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| 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 |
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| Electron Density: |
relectron=2.95 gm/cc |
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| Fermion Index |
Fermion Index = 0.00041 Boson Index = 0.99959 |
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| Photoelectric: |
PEGatumbaite = 2.83 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Gatumbaite is Not Radioactive |
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Gatumbaite Classification |
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| Dana Class: |
42.11.12.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen | ||
| (42.11)where (AB)4 (XO4)3 Zq · x(H2O) | |||
| (42.11.12)Dana Group | |||
| Strunz Class: |
VII/D.36-40 VII - Phosphates, Arsenates and Vanadates | ||
| VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K | |||
| VII/D.36 - Kovdorskite - Gatumbaite series | |||
Other Gatumbaite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Gatumbaite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris Search for Gatumbaite using: Visit our Advertisers for Gatumbaite : Translate Gatumbaite Mineral Data : Ask about Gatumbaite here : Print or Cut-and-Paste your Gatumbaite Specimen Label here :
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