Senegalite Mineral Data

Senegalite Mineral Data +

[Newest Minerals] [Equipment] [Analytical Services] [About Us] [Mineral Gallery] [eBay Store]
See Also: [Diamond Crystals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Rare Minerals, Meteorites, Equipment and Analytical Services
Excalibur Mineral Company, World leaders in the supply of rare species
Serving the scientific and collector communities since 1974

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Senegalite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Senegalite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Senegalite Mineral Data :

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 Español

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: