Senegalite Mineral Data

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.

Name Pronunciation:

Senegalite + Pronunciation

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 - Pyramidal H-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),

Physical Properties of Senegalite

Cleavage:

{100} Indistinct

Color:

Colorless, Light yellow.

Density:

2.552

Diaphaneity:

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
Ncalc = 1.58

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:

Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Senegalite =2.55 gm/cc.

Fermion Index:

Fermion Index = 0.000285329
Boson Index = 0.999714671

Photoelectric:

PE_Senegalite= 1.45 barns/electron
U=PE_Senegalite x rElectron Density= 3.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Senegalite is Not Radioactive

Senegalite Classification

Dana Class:

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

(42.06)where (AB)2 (XO4) Zq � x(H2O)

(42.06.07)Senegalite Group

42.06.07.01 Senegalite Al2(PO4)(OH)3•(H2O) P na2₁ mm2

42.06.07.02 Bulachite Al2(AsO4)(OH)3•3(H2O) Pmnm,P 2₁221,Pma2,P mn2₁ Ortho

Strunz Class:

08.DE.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DE -With only medium-sized cations, (OH, etc.):RO4 = 3:1

08.DE.05 Senegalite Al2(PO4)(OH)3•(H2O) P na2₁ mm2

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Senegalite

Al2(PO4)(OH)3•(H2O)
Dana No: 42.06.07.01 Strunz No: 08.DE.05
Locality:

Notes:

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