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Senegalite

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About SenegaliteHide

Flag of Senegal
Formula:
Al2(PO4)(OH)(OH)2 · H2O
Colour:
Colourless to light yellow. Green
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.552
Crystal System:
Orthorhombic
Name:
Named in 1976 by Zdeněk Johan after its discovery locality, the iron deposit of Kouroudiako, located in the valley of Faleme, in eastern Senegal.

Classification of SenegaliteHide

Approved
Approval Year:
1975
First Published:
1976
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
42.6.7.1

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

19 : Phosphates
7 : Phosphates of Al alone

Physical Properties of SenegaliteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless to light yellow. Green
Comment:
Fresh Senegalite is green becoming yellow on exposure to sunlight
Hardness:
5½ on Mohs scale
Cleavage:
Poor/Indistinct
{010}, poor
Density:
2.552(7) g/cm3 (Measured)    2.551 g/cm3 (Calculated)

Optical Data of SenegaliteHide

Type:
Biaxial (+)
RI values:
nα = 1.562 nβ = 1.566 nγ = 1.587
2V:
Measured: 53° , Calculated: 48°
Max Birefringence:
δ = 0.025
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
strong

Chemical Properties of SenegaliteHide

Formula:
Al2(PO4)(OH)(OH)2 · H2O
IMA Formula:
Al2(PO4)(OH)3 · H2O

Crystallography of SenegaliteHide

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 V:
569.05 ų (Calculated from Unit Cell)
Z:
4
Morphology:
flattened on
[010], showing large
{
001
}
,
{
010
}
,
{
101
}
,
{
111
}
, small
{
100
}
,
{
011
}
,
{
021
}
.
Comment:
SG P21nb (non-standard setting)

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of SenegaliteHide

Place of Conservation of Type Material:
National School of Mines, Paris, France.
Associated Minerals at Type Locality:

Synonyms of SenegaliteHide

Other Language Names for SenegaliteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Turquoise75 photos of Senegalite associated with Turquoise on mindat.org.
Crandallite22 photos of Senegalite associated with Crandallite on mindat.org.
Augelite4 photos of Senegalite associated with Augelite on mindat.org.
Wavellite2 photos of Senegalite associated with Wavellite on mindat.org.
Variscite1 photo of Senegalite associated with Variscite on mindat.org.
Limonite1 photo of Senegalite associated with Limonite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.DE.10FluelliteAl2(PO4)F2(OH) · 7H2OOrth. mmm (2/m 2/m 2/m) : Fddd
8.DE.15BulachiteAl2(AsO4)(OH)3 · 3H2OOrth.
8.DE.20ZapataliteCu3Al4(PO4)3(OH)9 · 4H2OTet.
8.DE.25CeruleiteCu2Al7(AsO4)4(OH)13 · 11.5H2OTric.
8.DE.35AldermaniteMg5Al12(PO4)8(OH)22 · 32H2OOrth.
8.DE.40Juanitaite(Cu,Ca,Fe)10Bi(AsO4)4(OH)11 · 2H2OTet. 4/mmm (4/m 2/m 2/m) : P42/nnm
8.DE.45IangreyiteCa2Al7(PO4)2(PO3OH)2(OH,F)15 · 8H2OTrig. 3 2 : P3 2 1

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

42.6.7.2BulachiteAl2(AsO4)(OH)3 · 3H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.7.1BerliniteAlPO4Trig. 3 2 : P31 2 1
19.7.2AugeliteAl2(PO4)(OH)3Mon. 2/m : B2/m
19.7.3TrolleiteAl4(PO4)3(OH)3Mon. 2/m : B2/b
19.7.5VarisciteAlPO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
19.7.6MetavarisciteAlPO4 · 2H2OMon. 2/m : P21/b
19.7.7BolivariteAl2(PO4)(OH)3 · 4-5H2OAmor.
19.7.8WavelliteAl3(PO4)2(OH,F)3 · 5H2OOrth. mmm (2/m 2/m 2/m)
19.7.9EvansiteAl3(PO4)(OH)6 · 6H2OAmor.
19.7.10VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
19.7.11KingiteAl3(PO4)2F2(OH) · 7H2OTric.
19.7.12VashegyiteAl11(PO4)9(OH)6 · 38H2OOrth. mmm (2/m 2/m 2/m)

Other InformationHide

Special Storage/
Display Requirements:
Fades from green to yellow in sunlight. Keep out of Sunlight!
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 SenegaliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Johan, Z. (1976) La sénégalite, Al2(PO4)(OH)3 •H2O, un nouveau minéral. Lithos: 9: 165–171.
Fleischer, M., Cabri, L.J., Nickel, E.H., Pabst, A. (1977) New mineral names. American Mineralogist: 62: 593-600.
Keegan, T.D., Araki, T., Moore, P.B. (1979) Senegalite, Al2(OH)3(H2O)(PO4), a novel structure type. American Mineralogist: 64: 1243–1247.
Gineste, C. (2005) Sénégalite et phosphates associés de Kouroudiako, Falémé, Sénégal. Le Règne Minéral: 65: 13-24.
Frost, R.L., López, A., Xi, Y., Murta, N., Scholz, R. (2013) The molecular structure of the phosphate mineral senegalite Al2(PO4)(OH)3⋅3H2O – A vibrational spectroscopic study. Journal of Molecular Structure: 1048: 420-425.

Internet Links for SenegaliteHide

Localities for SenegaliteHide

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.
Brazil
 
  • Maranhão
    • Godofredo Viana
Sioeira, N. v. m. e., & DE Oliveira, N. p. 0 (1982) Padrão DE Distribuição DE Elementos Principais E Traços'nas Lateritas Fosfatadas Da Chapada DE Pirocaua (Ha).
  • Minas Gerais
    • Brumadinho
B Gioia collection; Frost, R. L., López, A., Xi, Y., Murta, N., & Scholz, R. (2013). The molecular structure of the phosphate mineral senegalite Al 2 (PO 4)(OH) 3⋅ 3H 2 O–A vibrational spectroscopic study. Journal of Molecular Structure, 1048, 420-425.
  • Pará
    • Monte Alegre
      • Maicuru range
Lemos, V. P., & da Costa, M. C. (1989). Mineralogical aspects of the laterites of Maicuru. Sociedade Brasileira de Geoquimica, Rio de Janeiro, RJ (Brazil); 531 p; 1989; p. 375-384; 13. International Geochemical Exploration Symposium. 2. Brazilian Geochemical Congress; Rio de Janeiro, RJ (Brazil); 1-6 Oct 1989
Senegal (TL)
 
  • 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.; Keegan T D, Araki T, Moore P B (1979) Senegalite, Al2(OH)3(H2O)(PO4), a novel structure type, American Mineralogist, 64, 1243-1247
Mineral and/or Locality  
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