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 % Al2 O3
Phosphorus 14.21 % P 32.56 % P2 O5
Hydrogen 2.31 % H 20.66 % H2 O
Oxygen 58.72 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Al2 (PO4 )(OH)3 •(H2 O)
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 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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PESenegalite = 1.45 barns/electronU=PESenegalite x r Electron 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 21 221,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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