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Gatumbaite

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About GatumbaiteHide

Formula:
CaAl2(PO4)2(OH)2 · H2O
Colour:
white
Lustre:
Pearly
Hardness:
4 - 5
Specific Gravity:
2.92
Crystal System:
Monoclinic
Name:
Named for the type locality in the Gatumba District, Rwanda.
This page provides mineralogical data about Gatumbaite.


Classification of GatumbaiteHide

Approved
Approval Year:
1976
8.DJ.10

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
J : With large and medium-sized cations, (OH, etc.):RO4 = 1:1
42.11.12.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
19.8.15

19 : Phosphates
8 : Phosphates of Al and other metals

Physical Properties of GatumbaiteHide

Pearly
Transparency:
Translucent
Colour:
white
Streak:
white
Hardness:
4 - 5 on Mohs scale
Tenacity:
Brittle
Fracture:
Splintery
Density:
2.92 g/cm3 (Measured)    2.95 g/cm3 (Calculated)

Optical Data of GatumbaiteHide

Type:
Biaxial (-)
RI values:
nα = 1.610 nβ = 1.630 nγ = 1.639
2V:
Measured: 65° , Calculated: 67°
Max Birefringence:
δ = 0.029
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively strong

Chemical Properties of GatumbaiteHide

Formula:
CaAl2(PO4)2(OH)2 · H2O

Chemical AnalysisHide

Oxide wt%:
 1
P2O541,35 %
Al2O328,09 %
Fe2O32,20 %
MnO0,30 %
CaO17,35 %
Na2O0,30 %
H2O+10,68 %
H2O-0,32 %
Total:98 %
Sample references:
IDLocalityReference
1Buranga pegmatite, Gatumba District, Western Province, Rwandavon Knorring, O. and Fransolet, A.-M. (1977) Gatumbaite, CaAl2(PO4)2(OH)2.H2O: a new species from Buranga pegmatite, Rwanda. Neues Jahrbuch für Mineralogie, Monatshefte: 12: 561-568.

Crystallography of GatumbaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/m
Cell Parameters:
a = 6.907 Å, b = 5.095 Å, c = 10.764 Å
β = 91.05°
Ratio:
a:b:c = 1.356 : 1 : 2.113
Unit Cell V:
378.73 ų (Calculated from Unit Cell)
Z:
2

Type Occurrence of GatumbaiteHide

General Appearance of Type Material:
white millimetric sheaves and rosettes with trolleite, scorzalite, apatite, and bjarebyite.
Place of Conservation of Type Material:
Royal Museum of Central Africa, Tervuren, Belgium;
National Museum of Natural History, Washington, DC, USA
Geological Setting of Type Material:
phosphate assemblage in a complex granite pegmatite

Synonyms of GatumbaiteHide

Other Language Names for GatumbaiteHide

German:Gatumbait
Spanish:Gatumbaita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Scorzalite3 photos of Gatumbaite associated with Scorzalite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.DJ.05JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)Orth.
8.DJ.05OlmsteaditeKFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2OOrth.
8.DJ.15CamgasiteCaMg(AsO4)(OH) · 5H2OMon. 2/m : P21/m
8.DJ.20Phosphofibrite(H2O,K)3.5Fe8(PO4)6(OH)7 · 5H2OMon. 2/m
8.DJ.20Meurigite-KKFe3+8(PO4)6(OH)7 · 6.5H2OMon. 2/m : B2/b
8.DJ.20Meurigite-NaNaFe3+8(PO4)6(OH)7 · 6.5H2OMon. 2/m : B2/b
8.DJ.25JungiteCa2Zn4Fe3+8(PO4)9(OH)9 · 16H2OOrth.
8.DJ.30WycheproofiteNaAlZr(PO4)2(OH) · H2OTric.
8.DJ.35ErcititeNa2Mn3+2(PO4)2(OH)2 · 4H2OMon.
8.DJ.40MrázekiteBi2Cu3(PO4)2O2(OH)2 · H2OMon. 2/m
8.DJ.45AttikaiteCa3Cu2Al2(AsO4)4(OH)4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pban

Related Minerals - Dana Grouping (8th Ed.)Hide

42.11.12.2KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.8.1MontebrasiteLiAl(PO4)(OH)Tric. 1 : P1
19.8.2BrazilianiteNaAl3(PO4)2(OH)4Mon. 2/m : P2/b
19.8.3WarditeNaAl3(PO4)2(OH)4 · 2H2OTet. 4 2 2 : P41 21 2
19.8.4TancoiteLiNa2Al(PO4)(HPO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pbca
19.8.5Bertossaite(Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4Orth.
19.8.6TinsleyiteKAl2(PO4)2(OH) · 2H2OMon.
19.8.7Taranakite(K,NH4)Al3(PO4)3(OH) · 9H2OTrig. 3m (3 2/m) : R3c
19.8.8FrancoanelliteK3Al5(PO4)2(HPO4)3 · 12H2OTrig.
19.8.9GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
19.8.10AldermaniteMg5Al12(PO4)8(OH)22 · 32H2OOrth.
19.8.11OveriteCaMgAl(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
19.8.12MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2OMon. 2 : B2
19.8.14FoggiteCaAl(PO4)(OH)2 · H2OOrth.
19.8.16CrandalliteCaAl3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
19.8.17Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2OMon.
19.8.19LehiiteCaAl3(PO4)(PO3OH)(OH)6
19.8.20Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2OTet.
19.8.21EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2OMon. 2/m
19.8.22KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
19.8.23MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2OOrth.
19.8.24PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2OOrth. mmm (2/m 2/m 2/m) : Pbca

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for GatumbaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
von Knorring, O. (1972) Notes on phosphate minerals from Buranga pegmatite. 16th annual Report res. Inst. afr. Geol., Univ. Leeds, 56-57 (as unnamed Ca-Fe phosphate phase).
von Knorring, O. and Fransolet, A.-M. (1977) Gatumbaite, CaAl2(PO4)2(OH)2.H2O: a new species from Buranga pegmatite, Rwanda. Neues Jahrbuch für Mineralogie, Monatshefte: 12: 561-568; American Mineralogist: 63: 793-794 (abstract).
Duggan, M.B., et al. (1990) Phosphate minerals in altered andesite from Mount Perry, Queensland, Australia. Canadian Mineralogist: 28: 125-131.
Daltry, V.D.C. and von Knorring, O. (1998) Type-mineralogy of Rwanda with particular reference to the Buranga pegmatite. Geologica Belgica: 1: 9-15.

Internet Links for GatumbaiteHide

Localities for GatumbaiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • Queensland
    • North Burnett Region
Duggan, et al., Canadian Mineralogist 28,125-131(1990); Duggan, M. B., Jones, M. T., Richards, D. N., & Kamprad, J. L. (1990). Phosphate minerals in altered andesite from Mount Perry, Queensland, Australia. Canadian Mineralogist, 28, 125-131.
Czech Republic
 
  • Karlovy Vary Region
    • Aš (Asch)
Breiter K., Škoda R., Veselovský F.: Neobvyklý P-, Li- a Sn-bohatý pegmatit z Vernéřova u Aše, Česká republika. Bulletin Mineralogicko-petrografického oddělení Národního muzea v Praze, 2009, roč. 17, č. 1, s. 41-59.
Japan
 
  • Honshu Island
    • Chugoku Region
      • Yamaguchi Prefecture
        • Abu town
Matsubara, S. & A. Kato: Phosphates from the Hinomaru-Nako mine, Abu-cho, Yamaguchi Prefecture, Western Japan: Mem.Natn.Sci.Mus., Tokyo, 30,167-183(1998)
Rwanda (TL)
 
  • Western Province
    • Gatumba District
von Knorring, O. (1972) Notes on phosphate minerals from Buranga pegmatite. 16th annual Report res. Inst. afr. Geol., Univ. Leeds, 56-57 (as unnamed Ca-Fe phosphate phase).; von Knorring, O. and Fransolet, A.-M. (1977) Gatumbaite, CaAl2(PO4)2(OH)2.H2O: a new species from Buranga pegmatite, Rwanda. Neues Jahrbuch für Mineralogie, Monatshefte: 12: 561-568.; Daltry, V.D.C. and von Knorring, O. (1998) Type-mineralogy of Rwanda with particular reference to the Buranga pegmatite. Geologica Belgica: 1: 9-15.; HB4 (2000).
Sweden
 
  • Värmland
    • Torsby
Ek, R. and Nysten, P.E. (1990) Phosphate mineralogy of the Hålsjöberg and Hökensås kyanite deposits. Geologiska Föreningens I Stockholm. Förhandlingar, Stockholm: 112: 9-18.; Daltry, V.D.C. and von Knorring, O. (1998) Type-mineralogy of Rwanda with particular reference to the Buranga pegmatite. Geologica Belgica: 1: 9-15 (referring to Ek and Nysten, 1990).
  • Västergötland
    • Tidaholm
Collection of NHM, Vienna
USA
 
  • New Hampshire
    • Grafton Co.
      • Groton
Segeler, C.G., Ulrich, W., Kampf, A.R., and Whitmore, R.W. (1981) Phosphate minerals of the Palermo No. 1 Pegmatite. Rocks & Minerals: 56: 196-214.; Peacor, D.R., Dunn, P.J., Roberts, W.L., Campbell, T.J., and Simmons, W.B. (1984) Sinkankasite, a new phosphate from the Barker pegmatite, South Dakota. American Mineralogist: 69: 380-382. Daltry, V.D.C. and von Knorring, O. (1998) Type-mineralogy of Rwanda with particular reference to the Buranga pegmatite. Geologica Belgica: 1: 9-15. (referring to Segeler et al., 1981).
Mineral and/or Locality  
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