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Gatumbaite

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Hålsjöberg (Horrsjöberg), Torsby, Värmland, Sweden
© Elmar Lackner

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Formula:
CaAl
 
2
[OH|PO
 
4
]
 
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
[OH|PO
 
4
]
 
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+
 
)[O|PO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.DJ.05Olmsteadite
KFe
2+
2
(Nb
5+
 
,Ta
5+
 
)[O|PO
 
4
]
 
2
 · 2H
 
2
O
8.DJ.15Camgasite
CaMg[OH|AsO
 
4
] · 5H
 
2
O
8.DJ.20Phosphofibrite
[K
 
<0.5
(H
 
2
O)
 
3
][(Fe
3+
 
,Cu)
 
8
(PO
 
4
)
 
6
(OH)
 
7
(H
 
2
O)
 
4
]
8.DJ.20Meurigite-K
[K(H
 
2
O)
 
2.5
][Fe
3+
8
(PO
 
4
)
 
6
(OH)
 
7
(H
 
2
O)
 
4
]
8.DJ.20Meurigite-Na
[Na(H
 
2
O)
 
2.5
][Fe
3+
8
(PO
 
4
)
 
6
(OH)
 
7
(H
 
2
O)
 
4
]
8.DJ.25Jungite
Ca
 
2
Zn
 
4
Fe
3+
8
[OH|PO
 
4
]
 
9
 · 16H
 
2
O
8.DJ.30Wycheproofite
NaAlZr[OH|PO
 
4
]
 
2
 · H
 
2
O
8.DJ.35Ercitite
Na
 
2
(H
 
2
O)
 
4
[Mn
3+
2
(OH)
 
2
(PO
 
4
)
 
2
]
8.DJ.40Mrázekite
Bi
 
2
Cu
 
3
[O|OH|PO
 
4
]
 
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[(OH,F)|PO
 
4
]
19.8.2Brazilianite
NaAl
 
3
[(OH)
 
2
|PO
 
4
]
 
2
19.8.3Wardite
NaAl
 
3
[(OH)
 
2
|PO
 
4
]
 
2
 · 2H
 
2
O
19.8.4Tancoite
LiNa
 
2
Al[OH|HPO
 
4
|PO
 
4
]
19.8.5Bertossaite
(Li,Na)
 
2
(Ca,Fe
2+
 
,Mn
2+
 
)Al
 
4
[(OH,F)|PO
 
4
]
 
4
19.8.6Tinsleyite
KAl
 
2
[OH|(PO
 
4
)
 
2
] · 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
[(HPO
 
4
)
 
3
|PO
 
4
]
 
2
 · 12H
 
2
O
19.8.9Gordonite
MgAl
 
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
19.8.10Aldermanite
Mg
 
5
Al
 
12
[(OH)
 
11
|(PO
 
4
)
 
4
]
 
2
 · 32H
 
2
O
19.8.11Overite
CaMgAl[OH|(PO
 
4
)
 
2
] · 4H
 
2
O
19.8.12Montgomeryite
Ca
 
4
MgAl
 
4
[(OH)
 
2
|(PO
 
4
)
 
3
]
 
2
 · 12H
 
2
O
19.8.14Foggite
CaAl[(OH)
 
2
|PO
 
4
] · H
 
2
O
19.8.16Crandallite
CaAl
 
3
[(OH)
 
5
|(PO
 
4
)
 
2
] · H
 
2
O
19.8.17Matulaite
CaAl
 
18
[(OH)
 
5
|(PO
 
4
)
 
3
]
 
4
 · 28H
 
2
O
19.8.19Lehiite
19.8.20Millisite
(Na,K)CaAl
 
6
[(OH)
 
9
|(PO
 
4
)
 
4
] · 3H
 
2
O
19.8.21Englishite
K
 
3
Na
 
2
Ca
 
10
Al
 
15
[OH|(PO
 
4
)
 
3
]
 
7
 · 26H
 
2
O
19.8.22Kleemanite
ZnAl
 
2
[OH|PO
 
4
]
 
2
 · 3H
 
2
O
19.8.23Mantienneite
KMg
 
2
Al
 
2
Ti[(OH)
 
3
|(PO
 
4
)
 
4
] · 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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    Localities for Gatumbaite

    Hide Locality List
    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
      • Bundaberg
    		Duggan, et al., Can. Min. 28,125-131(1990)
    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
    		GFF 112, 9-18(1990)
    • 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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