Mineralogy Database

Walentaite Mineral Data

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General Walentaite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Mn++,Fe++)Fe+++3(AsO4)(PO4)3(PO3OH)
Help on Composition: Composition: Molecular Weight = 733.47 gm
   Calcium      3.28 %  Ca    4.59 % CaO
   Manganese    2.25 %  Mn    2.90 % MnO
   Iron        23.60 %  Fe    0.98 % FeO / 32.66 % Fe2O3
   Arsenic     10.21 %  As   15.67 % As2O5
   Phosphorus  16.89 %  P    38.71 % P2O5
   Hydrogen     0.14 %  H     1.23 % H2O
   Oxygen      43.63 %  O
              ______        ______ 
              100.00 %       96.73 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.6Mn2+0.3Fe2+0.1Fe3+3(AsO4)(PO4)3(PO3)(OH)
Help on Environment: Environment: Secondary phosphate mineral.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: White Elephant mine, Pringle, Custer County, South Dakota, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Kurt Walenta (1927-), mineralogist, University of Stuttgart, Germany, who has studied many phosphate minerals.
Help on Name Pronunciation: Name Pronunciation: Walentaite + Pronunciation Say WALENTAITE

Walentaite Image

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Comments: Greenish yellow, flattened, radial, crystalline aggregates of walentaite on quartz.
Location: White Elephant mine, Custer County, South Dakota, USA. Scale: Picture size 1.5 cm.
© Tom Loomis / Dakota Matrix

Walentaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.5451:1:0.7158
Help on Cell Dimensions: Cell Dimensions: a = 26.24, b = 10.31, c = 7.38, Z = 5; V = 1,996.54 Den(Calc)= 3.05
Help on Crystal System: Crystal System: Orthorhombic Space Group: I mmm, I bam, I bca, I mma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.9(1), 3(0.5), 4.43(0.3),

Physical Properties of Walentaite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Greenish yellow, Yellow green, Bright yellow.
Help on Density: Density: 2.72
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow

Optical Properties of Walentaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.265 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.128 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2487,KPDmeas= 0.2789,KC= 0.2205
Ncalc = 1.6 - 1.67
Help on Optical Data: Optical Data: Biaxial (+), b=1.738, g=1.779,
Help on Pleochroism (x): Pleochroism (x): pale yellow green.
Help on Pleochroism (y): Pleochroism (y): pale yellow green.
Help on Pleochroism (z): Pleochroism (z): medium yellow green.

Calculated Properties of Walentaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.94 gm/cc
note: Specific Gravity of Walentaite =3.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0052578726
Boson Index = 0.9947421274
Help on Photoelectric: Photoelectric: PEWalentaite = 15.79 barns/electron
U=PEWalentaite x rElectron Density= 46.51 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Walentaite is Not Radioactive

Walentaite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.05)with miscellaneous formulae
  (40.05.10)Dana Group Walentaite (Ca,Mn,Fe)Fe3(AsO4)(PO4)3(PO3OH) I mmm, I bam, I bca, I mma Ortho
Help on  Strunz Class: Strunz Class: 08.CH.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CH -With large and medium-sized cations, RO4:H2O < 1:1
08.CH.05 Walentaite (Ca,Mn,Fe)Fe3(AsO4)(PO4)3(PO3OH) I mmm, I bam, I bca, I mma Ortho

Other Walentaite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Walentaite :
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

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Dana No: Strunz No: 08.CH.05





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