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Senegalite

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Big Photo

Mount Kourou Diakouma (Kouroudiako), Saraya, Falémé River basin, Tambacounda Region, Senegal
© Cédrick Gineste

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Formula:
Al
 
2
(PO
 
4
)(OH)
 
3
 · H
 
2
O
System:OrthorhombicColour:Colourless to light ...
Hardness:5½
Name:Named after its discovery locality, the iron deposit of Kouroudiako, located in the valley of Faleme, in Eastern Senegal.


Fluellite Group.

Classification of Senegalite

IMA status:Approved 1975
Strunz 8th edition ID:7/D.18-10
Nickel-Strunz 10th (pending) edition ID:8.DE.05

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
E : With only medium-sized cations, (OH, etc.):RO4 = 3:1
Dana 8th edition ID:42.6.7.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq·xH2O
Hey's CIM Ref.:19.7.4

19 : Phosphates
7 : Phosphates of Al alone
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Type Occurrence of Senegalite

Type Locality:Mount Kourou Diakouma (Kouroudiako), Saraya, Falémé River basin, Tambacounda Region, Senegal
Year of Discovery:1976

Physical Properties of Senegalite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colourless to light yellow
Hardness (Mohs):5½

Crystallography of Senegalite

Crystal System:Orthorhombic
Class (H-M):mm2 - Pyramidal
Cell Parameters:a = 7.675(4) Å, b = 9.711(4) Å, c = 7.635(4) Å
Ratio:a:b:c = 0.79 : 1 : 0.786
Unit Cell Volume:V 569.05 ų (Calculated from Unit Cell)
Z:4
Comment:SG P21nb (non-standard setting)
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Senegalite

Type:Biaxial (+)
RI values: nα = 1.562 nβ = 1.566 nγ = 1.587
2V:Measured: 53° , Calculated: 48°
Maximum Birefringence:δ = 0.025

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:strong

Chemical Properties of Senegalite

Formula:
Al
 
2
(PO
 
4
)(OH)
 
3
 · H
 
2
O
Essential elements:Al, H, O, P
All elements listed in formula:Al, H, O, P

Relationship of Senegalite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DE.10Fluellite
Al
 
2
(PO
 
4
)(OH)F
 
2
 · 7H
 
2
O
8.DE.15Bulachite
Al
 
2
(AsO
 
4
)(OH)
 
3
 · 3H
 
2
O
8.DE.20Zapatalite
Cu
 
3
Al
 
4
(PO
 
4
)
 
3
(OH)
 
9
 · 4H
 
2
O
8.DE.25Ceruleite
Cu
 
2
Al
 
7
(AsO
 
4
)
 
4
(OH)
 
13
 · 11.5H
 
2
O
8.DE.35Aldermanite
Mg
 
5
Al
 
12
(PO
 
4
)
 
8
(OH)
 
22
 · 32H
 
2
O
8.DE.40Juanitaite
Bi(Cu,Ca,Fe)
 
10
(AsO
 
4
)
 
4
(OH)
 
11
 · 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.7.1Berlinite
AlPO
 
4
19.7.2Augelite
Al
 
2
(PO
 
4
)(OH)
 
3
19.7.3Trolleite
Al
 
4
(PO
 
4
)
 
3
(OH)
 
3
19.7.5Variscite
AlPO
 
4
 · 2H
 
2
O
19.7.6Metavariscite
AlPO
 
4
 · 2H
 
2
O
19.7.7Bolivarite
Al
 
2
(PO
 
4
)(OH)
 
3
 · 4-5H
 
2
O
19.7.8Wavellite
Al
 
3
(PO
 
4
)
 
2
(OH,F)
 
3
 · 5H
 
2
O
19.7.9Evansite
Al
 
3
(PO
 
4
)(OH)
 
6
 · 6H
 
2
O
19.7.10Vantasselite
Al
 
4
(PO
 
4
)
 
3
(OH)
 
3
 · 9H
 
2
O
19.7.11Kingite
Al
 
3
(PO
 
4
)
 
2
(OH)
 
3
 · 9H
 
2
O
19.7.12Vashegyite
Al
 
11
(PO
 
4
)
 
9
(OH)
 
6
 · 38H
 
2
O

Other Names for Senegalite

Synonyms:
IMA1975-004
Other Languages:
German:Senegalit
Russian:Сенегалит
Spanish:Senegalita

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 Senegalite

Reference List:

- +
Johan, Z. (1976) La sénégalite, Al2(PO4)(OH)3 •H2O, un nouveau minéral. Lithos, 9, 165–171.

American Mineralogist (1977): 62: 595-596.

Keegan, T.D., T. Araki, and P.B. Moore (1979) Senegalite, Al2(OH)3(H2O)(PO4), a novel structure type. Amer. Mineral., 64, 1243–1247.

Gineste, C. (2005): Sénégalite et phosphates associés de Kouroudiako, Falémé, Sénégal. Le Règne Minéral n°65, sept-oct 2005, 13-24.

Internet Links for Senegalite

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

    Hide Locality List
    (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.
    Brazil
     
    • Minas Gerais
      • Brumadinho
    		B Gioia collection
    Senegal
     
    • Tambacounda Region
      • Falémé River basin
        • Saraya
    		Gineste, C. & Bantsimba, C. (2005): Sénégalite et phosphates associés de Kouroudiako, Falémé, Sénégal. Le Règne Minéral, 65, 13-24.
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