Senegalite Mineral Data

Senegalite Mineral Data
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General Senegalite Information

Help on Chemical Formula: Chemical Formula: Al2(PO4)(OH)3•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Al2(PO4)(OH)3•(H2O)
Help on Environment: Environment: Found in the oxidation zone. Forms a series with bulachite.
Help on IMA Status: IMA Status: Approved IMA 1976
Help on Locality: Locality: Kourondicko iron ore (magnetite) deposit, Faleme River Basin, Senegal. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Senegalite + Pronunciation Say SENEGALITE
Help on Synonym: Synonym: ICSD 100542
  PDF 36-409
 

Senegalite Image

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Senegalite

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

Senegalite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.2739:1:1.0093
Help on Cell Dimensions: Cell Dimensions: a = 9.678, b = 7.597, c = 7.668, Z = 4; V = 563.78 Den(Calc)= 2.57
Help on Crystal System: Crystal System: Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P na21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.834(1), 2.99(0.9), 4.089(0.9),
Click Here for Large Senegalite Structure Window 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

Help on Cleavage: Cleavage: {100} Indistinct
Help on Color: Color: Colorless, Light yellow.
Help on Density: Density: 2.552
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Senegalite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Senegalite =2.55 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.000285329
Boson Index = 0.999714671
Help on Photoelectric: Photoelectric: PESenegalite = 1.45 barns/electron
U=PESenegalite x rElectron Density= 3.73 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Senegalite is Not Radioactive
 

Senegalite Classification
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Ask about Senegalite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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: