Senegalite Mineral Data

Senegalite Mineral Data +

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General Senegalite Information

Chemical Formula:

Al2(PO4)(OH)3·(H2O)

Composition:

Molecular Weight = 217.97 gm

Aluminum 24.76 % Al 46.78 % Al₂O₃

Phosphorus 14.21 % P 32.56 % P₂O₅

Hydrogen 2.31 % H 20.66 % H₂O

Oxygen 58.72 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al₂(PO₄)(OH)₃·(H₂O)

Environment:

Found in the oxidation zone. Forms a series with bulachite.

IMA Status:

Approved IMA 1976

Locality:

Kourondicko iron ore (magnetite) deposit, Faleme River Basin, Senegal. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 100542

PDF 36-409

Senegalite Image

Images:

Senegalite

Comments: Yellowish green, prismatic, crystals of senegalite.
Location: Faleme River, Senegal. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Senegalite Crystallography

Axial Ratios:

a:b:c =1.2739:1:1.0093

Cell Dimensions:

a = 9.678, b = 7.597, c = 7.668, Z = 4; V = 563.78 Den(Calc)= 2.57

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P na2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.834(1), 2.99(0.9), 4.089(0.9),

Crystal Structure:

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Keegan T D , Araki T , Moore P B , American Mineralogist , 64 (1979) p.1243-1247, Senegalite, Al2(OH)3(H2O)(PO4), a novel structure type

Physical Properties of Senegalite

Cleavage:

[100] Indistinct

Color:

Colorless, Light yellow.

Density:

2.552

Diaphaniety:

Transparent

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Senegalite

Gladstone-Dale:

CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2224,KPDmeas= 0.224,KC= 0.2267

Optical Data:

Biaxial (+), a=1.562, b=1.566, g=1.587, bire=0.0250, 2V(Calc)=48, 2V(Meas)=53. Dispersion r > v weak.

Calculated Properties of Senegalite

Electron Density:

r_electron=2.58 gm/cc
note: r_Senegalite=2.55 gm/cc.

Fermion Index

Fermion Index = 0.00028
Boson Index = 0.99972

Photoelectric:

PE_Senegalite= 1.45 barns/electron
U=PE_Senegalite x r_electron= 3.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Senegalite is Not Radioactive

Senegalite Classification

Dana Class:

42.6.7.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.6)where (AB)2 (XO4) Zq · x(H2O)

(42.6.7)Dana Group

42.6.7.1 Senegalite Al2(PO4)(OH)3·(H2O) P na2₁ mm2

42.6.7.2 Bulachite Al2(AsO4)(OH)3·3(H2O) Pmnm,P 2₁221,Pma2,P mn2₁ Ortho

Strunz Class:

VII/D.18-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.18 - Senegalite - Fluellite series

VII/D.18-10 Senegalite Al2(PO4)(OH)3·(H2O) P na2₁ mm2

VII/D.18-20 Bulachite Al2(AsO4)(OH)3·3(H2O) Pmnm,P 2₁221,Pma2,P mn2₁ Ortho

VII/D.18-30 Fluellite Al2(PO4)F2(OH)·7(H2O) F ddd 2/m 2/m 2/m

Other Senegalite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Senegalite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Translate Senegalite Mineral Data :

Ask about Senegalite here :
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Print or Cut-and-Paste your Senegalite Specimen Label here :

Senegalite

Al2(PO4)(OH)3·(H2O)
Dana No: 42.6.7.1 Strunz No: VII/D.18-10
Locality:

Notes: