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Mansfieldite Mineral Data

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General Mansfieldite Information

Help on Chemical  Formula: Chemical Formula: AlAsO4•2(H2O)
Help on Composition: Composition: Molecular Weight = 201.93 gm
   Aluminum  13.36 %  Al   25.25 % Al2O3
   Arsenic   37.10 %  As   56.91 % As2O5
   Hydrogen   2.00 %  H    17.84 % H2O
   Oxygen    47.54 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al(AsO4)•2(H2O)
Help on Environment: Environment: Forms a series with scorodite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1948
Help on Locality: Locality: Hovart Butte, Lane County, Oregon, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for George Rogers Mansfield (1875-1947), geologist, U. S. Geological Survey.
Help on Name Pronunciation: Name Pronunciation: Mansfieldite + Pronunciation Say MANSFIELDITE
 

Mansfieldite Image

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  Mansfieldite

Comments: White, spherical aggregates of mansfieldite.
Location: Cap Garonne Mine, Pradet, Var, Provence-Alpes-Côte d'Azur, France. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Mansfieldite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0327:1:0.8934
Help on Cell Dimensions: Cell Dimensions: a = 10.08, b = 9.76, c = 8.72, Z = 8; V = 857.88 Den(Calc)= 3.13
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcab
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.36(1), 5.45(1), 3.09(0.9),
 

Physical Properties of Mansfieldite

Help on Cleavage: Cleavage: {201} Indistinct
Help on Color: Color: White, Light gray, Reddish gray.
Help on Density: Density: 3.031
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Mansfieldite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.204,KPDmeas= 0.2107,KC= 0.2051
Ncalc = 1.62 - 1.64
Help on Optical Data: Optical Data: Biaxial (+), a=1.622-1.631, b=1.624-1.649, g=1.642-1.663, bire=0.0200-0.0320, 2V(Calc)=38-82, 2V(Meas)=30-68. Dispersion r < v.
 

Calculated Properties of Mansfieldite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.04 gm/cc
note: Specific Gravity of Mansfieldite =3.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002311828
Boson Index = 0.9997688172
Help on Photoelectric: Photoelectric: PEMansfieldite = 25.21 barns/electron
U=PEMansfieldite x rElectron Density= 76.59 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mansfieldite is Not Radioactive
 

Mansfieldite Classification

Help on  Dana Class: Dana Class: 40.04.01.04 (40)Hydrated Phosphates, etc
  (40.04)where A+++ XO4 � x(H2O)
  (40.04.01)Variscite Group
 
40.04.01.01 Variscite AlPO4•2(H2O) Pcab 2/m 2/m 2/m
 
40.04.01.02 Strengite FePO4•2(H2O) Pcab 2/m 2/m 2/m
 
40.04.01.03 Scorodite FeAsO4•2(H2O) Pcab 2/m 2/m 2/m
 
40.04.01.04 Mansfieldite AlAsO4•2(H2O) Pcab 2/m 2/m 2/m
 
40.04.01.05 Yanomamite In(AsO4)•2(H2O) P bca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.CD.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CD -With only medium-sized cations, RO4:H2O = 1:2
 
08.CD.10 Strengite FePO4•2(H2O) Pcab 2/m 2/m 2/m
 
08.CD.10 Mansfieldite AlAsO4•2(H2O) Pcab 2/m 2/m 2/m
 
08.CD.10 Variscite AlPO4•2(H2O) Pcab 2/m 2/m 2/m
 
08.CD.10 Scorodite FeAsO4•2(H2O) Pcab 2/m 2/m 2/m
 
08.CD.10 Yanomamite In(AsO4)•2(H2O) P bca 2/m 2/m 2/m
 

Other Mansfieldite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Mansfieldite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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

Mansfieldite

AlAsO4•2(H2O)
Dana No: 40.04.01.04 Strunz No: 08.CD.10
Locality:

 

Notes:

 

 
   
 


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