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Gatumbaite

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Formula:
CaAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
· H
 
2
O
System:MonoclinicColour:white
Hardness:4 - 5
Name:Named for locality
This page provides mineralogical data about Gatumbaite.

Classification of Gatumbaite

IMA status:Approved 1976
Strunz 8th edition ID:7/D.36-40
Nickel-Strunz 10th (pending) edition ID: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 edition ID: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
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Type Occurrence of Gatumbaite

Type Locality:Buranga pegmatite, Gatumba District, Western Province, Rwanda
Place of Conservation of Type Material:Royal Museum of Central Africa, Tervuren, Belgium; National Museum of Natural History, Washington, DC, USA
Year of Discovery:1977
Geological Setting of type material:phosphate assemblage in a complex granite pegmatite

Occurrences of Gatumbaite

Geological Setting:andesite altered hydrothermally through hydrogen metasomatism (Mt. Perry, Australia)

Physical Properties of Gatumbaite

Lustre:Pearly
Diaphaneity (Transparency):Translucent
Colour:white
Streak:white
Hardness (Mohs):4 - 5
Tenacity:Brittle
Fracture:Splintery
Density (measured):2.92 g/cm3
Density (calculated):2.95 g/cm3

Crystallography of Gatumbaite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P2/m {P1 1 2/m} {P2/m} {P1 2/m 1}
Cell Parameters:a = 6.907Å, b = 5.095Å, c = 10.764Å
β = 91.05°
Ratio:a:b:c = 1.356 : 1 : 2.113
Unit Cell Volume:V 378.73 ų (Calculated from Unit Cell)
Z:2

Optical Data of Gatumbaite

Type:Biaxial (-)
RI values: nα = 1.610 nβ = 1.630 nγ = 1.639
2V:Measured: 65° , Calculated: 67°
Maximum Birefringence:δ = 0.029

Chart 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 Gatumbaite

Formula:
CaAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
· H
 
2
O
Essential elements:Al, Ca, H, O, P
All elements listed in formula:Al, Ca, H, O, P

Relationship of Gatumbaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DJ.05Johnwalkite
K(Mn
2+
 
,Fe
2+
 
,Fe
3+
 
)
 
2
(Nb
5+
 
,Ta
5+
 
)(PO
 
4
)
 
2
O
 
2
· 2(H
 
2
O,OH)
8.DJ.05Olmsteadite
KFe
2+
2
(Nb
5+
 
,Ta
5+
 
)(PO
 
4
)
 
2
O
 
2
· 2H
 
2
O
8.DJ.15Camgasite
CaMg(AsO
 
4
)(OH) · 5H
 
2
O
8.DJ.20Phosphofibrite
K
 
<0.5
(Fe
3+
 
,Cu)
 
8
(PO
 
4
)
 
6
(OH)
 
7
· 7H
 
2
O
8.DJ.20Meurigite-K
KFe
3+
8
(PO
 
4
)
 
6
(OH)
 
7
· 6.5H
 
2
O
8.DJ.20Meurigite-Na
NaFe
3+
8
(PO
 
4
)
 
6
(OH)
 
7
· 6.5H
 
2
O
8.DJ.25Jungite
Ca
 
2
Zn
 
4
Fe
3+
8
(PO
 
4
)
 
9
(OH)
 
9
· 16H
 
2
O
8.DJ.30Wycheproofite
NaAlZr(PO
 
4
)
 
2
(OH) · H
 
2
O
8.DJ.35Ercitite
Na
 
2
Mn
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
8.DJ.40Mrázekite
Bi
 
2
Cu
 
3
(PO
 
4
)
 
2
O
 
2
(OH)
 
2
· H
 
2
O
8.DJ.45Attikaite
Ca
 
3
Cu
 
2
Al
 
2
(AsO
 
4
)
 
4
(OH)
 
4
· 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.8.1Montebrasite
LiAl(PO
 
4
)(OH)
19.8.2Brazilianite
NaAl
 
3
(PO
 
4
)
 
2
(OH)
 
2
19.8.3Wardite
NaAl
 
3
(PO
 
4
)
 
2
(OH)
 
4
· 2H
 
2
O
19.8.4Tancoite
LiNa
 
2
Al(PO
 
4
)(HPO
 
4
)(OH)
19.8.5Bertossaite
(Li,Na)
 
2
(Ca,Fe
2+
 
,Mn
2+
 
)Al
 
4
(PO
 
4
)
 
4
(OH,F)
 
4
19.8.6Tinsleyite
KAl
 
2
(PO
 
4
)
 
2
(OH) · 2H
 
2
O
19.8.7Taranakite
(K,NH
 
4
)Al
 
3
(PO
 
4
)
 
3
(OH) · 9H
 
2
O
19.8.8Francoanellite
K
 
3
Al
 
5
(PO
 
4
)
 
2
(HPO
 
4
)
 
3
· 12H
 
2
O
19.8.9Gordonite
MgAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
19.8.10Aldermanite
Mg
 
5
Al
 
12
(PO
 
4
)
 
8
(OH)
 
22
· 32H
 
2
O
19.8.11Overite
CaMgAl(PO
 
4
)
 
2
(OH) · 4H
 
2
O
19.8.12Montgomeryite
Ca
 
4
MgAl
 
4
(PO
 
4
)
 
6
(OH)
 
4
· 12H
 
2
O
19.8.14Foggite
CaAl(PO
 
4
)(OH)
 
2
· H
 
2
O
19.8.16Crandallite
CaAl
 
3
(PO
 
4
)
 
2
(OH)
 
5
· H
 
2
O
19.8.17Matulaite
(Fe
3+
 
,Al)Al
 
7
(PO
 
4
)
 
4
(PO
 
3
OH)
 
2
(OH)
 
8
(H
 
2
O)
 
8
· 8H
 
2
O
19.8.19Lehiite
19.8.20Millisite
(Na,K)CaAl
 
6
(PO
 
4
)
 
4
(OH)
 
9
· 3H
 
2
O
19.8.21Englishite
K
 
3
Na
 
2
Ca
 
10
Al
 
15
(PO
 
4
)
 
21
(OH)
 
7
· 26H
 
2
O
19.8.22Kleemanite
ZnAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 3H
 
2
O
19.8.23Mantienneite
KMg
 
2
Al
 
2
Ti(PO
 
4
)
 
4
(OH)
 
3
· 15H
 
2
O
19.8.24Paulkerrite
K(Mg,Mn
2+
 
)
 
2
(Fe
3+
 
,Al,Ti,Mg)
 
2
Ti(PO
 
4
)
 
4
(OH)
 
3
· 15H
 
2
O

Other Names for Gatumbaite

Synonyms:
IMA1976-019
Other Languages:
German:Gatumbait
Spanish:Gatumbaita

Other Information

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

References for Gatumbaite

Reference List:

- +
von Knorring, O & A-M. Fransolet (1977): "Gatumbaite, a new species from Buranga pegmatite, Rwanda": Neues Jahrb. Mineral., Monatsh: 12: 561-568;
Am.Min.: 63: 793-794.(abstract)

Duggan,M.B., et al. (1990): "Phosphate minerals in altered andesite from Mount Perry, Queensland, Australia": Can. Min.: 28: 125-131.

Internet Links for Gatumbaite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Gatumbaite details from Handbook of Mineralogy (PDF)
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  • Localities for Gatumbaite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • Queensland
      • North Burnett Region
    Duggan, et al., Can. Min. 28,125-131(1990)
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • 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
    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
     
    • Western Province
      • Gatumba District
    NJMM (1977), 561; HB4 (2000)
    Sweden
     
    • Värmland
      • Torsby
    Ek, Roland & Nysten, Per (1990): Phosphate mineralogy of the Hålsjöberg and Hökensås kyanite deposits. Geologiska Föreningens I Stockholm. Förhandlingar, Stockholm: 112: 9-18.
    • Västergötland
      • Tidaholm
    Collection of NHM, Vienna
    USA
     
    • New Hampshire
      • Grafton Co.
        • Groton
    Rocks & Min. (Sept/Oct 1981); American Mineralogist (1984): 69: 380-382.
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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