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Gatumbaite

A valid IMA mineral species
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09749240015543795515769.jpg
Gatumbaite, etc.

Hålsjöberg, Torsby, Värmland County, Sweden
04247040014970903786461.jpg
Gatumbaite, etc.

Hålsjöberg, Torsby, Värmland County, Sweden
02392840014977194672562.jpg
Gatumbaite, etc.

Hålsjöberg, Torsby, Värmland County, Sweden
04247040014970903786461.jpg
Gatumbaite, etc.

Hålsjöberg, Torsby, Värmland County, Sweden
09109920014947761868125.jpg
Gatumbaite, etc.

Hålsjöberg, Torsby, Värmland County, Sweden
04247040014970903786461.jpg
Gatumbaite, etc.

Hålsjöberg, Torsby, Värmland County, Sweden
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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.


Unique IdentifiersHide

Mindat ID:
1659
Long-form identifier:
mindat:1:1:1659:5
GUID
(UUID V4):
d5359c5f-b9e1-4a50-8d23-6a7e5c943f78

IMA Classification of GatumbaiteHide

IMA status:
Approved
Approval year:
1976
First published:
1977

Classification of GatumbaiteHide

Strunz-mindat (2023):
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
Dana 8th ed.:
42.11.12.1

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

19 : Phosphates
8 : Phosphates of Al and other metals

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
GtbIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of GatumbaiteHide

Lustre:
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
Optical Extinction:
Z = b; OAP ⊥ {010}.

Chemistry of GatumbaiteHide

Mindat Formula:
CaAl2(PO4)2(OH)2 · H2O
Elements listed:
Al, Ca, H, O, P - search for minerals with similar chemistry

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:
IDLocalityReferenceNotes
1Buranga pegmatite, Muhororo, Ngororero 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 f

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.210 Å(100)
2.241 Å(100)
1.726 Å(75)
2.772 Å(70)
2.301 Å(65)
3.207 Å(50)
3.159 Å(50)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
22 : Hydration and low-? subsurface aqueous alteration (see also #23)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites
Geological Setting:
Andesite altered hydrothermally through hydrogen metasomatism (Mt. Perry, Australia).

Type Occurrence of GatumbaiteHide

Type Locality:
ⓘ Buranga pegmatite, Muhororo, Ngororero District, Western Province, Rwanda
General Appearance of Type Material:
White millimetric sheaves and rosettes.
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.
Associated Minerals at Type Locality:
TrolleiteScorzaliteApatiteBjarebyite

Synonyms of GatumbaiteHide

Other Language Names for GatumbaiteHide

German:Gatumbait
Spanish:Gatumbaita

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Gatumbaite associated with ScorzaliteFe2+Al2(PO4)2(OH)2

Related Minerals - Strunz-mindat GroupingHide

8.DJ.05JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)Orth. mm2
8.DJ.05OlmsteaditeKFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2OOrth. mm2
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. 1 : P1
8.DJ.35ErcititeNa2Mn3+2(PO4)2(OH)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Cmca
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
8.DJ.50MengeiteBa(Mg,Mn2+)Mn3+4(PO4)4(OH)4 · 4H2OTric. 1 : P1

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.

Internet Links for GatumbaiteHide

References for GatumbaiteHide

Reference List:
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.
Fleischer, M., Pabst, A., White, J.S. (1978) New mineral names. American Mineralogist, 63, 793-796.
Duggan, M.B., Jones, M.T., Richards, D.N.G., Kamprad, J.L. (1990) Phosphate minerals in altered andesite from Mount Perry, Queensland, Australia. The 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.

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 references and 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 (e.g. 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
    • Cheb District
      • Aš
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
 
  • Yamaguchi Prefecture
    • Abu District
      • 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
    • Ngororero District
      • Muhororo
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 County
    • Torsby
Ek, Roland, Nysten, Per (1990) Phosphate mineralogy of the Hålsjöberg and Hökensås kyanite deposits. Geologiska Föreningen i Stockholm Förhandlingar, 112 (1). 9-18 doi:10.1080/11035899009453156
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).
  • Västra Götaland County
    • Tidaholm
Collection of NHM, Vienna
USA
 
  • New Hampshire
    • Grafton County
      • 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).
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