Walentaite Mineral Data
General Walentaite Information
Chemical Formula:
(Ca,Mn++,Fe++)Fe+++3(AsO4)(PO4)3(PO3OH)
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 % Fe2 O3
Arsenic 10.21 % As 15.67 % As2 O5
Phosphorus 16.89 % P 38.71 % P2 O5
Hydrogen 0.14 % H 1.23 % H2 O
Oxygen 43.63 % O
______ ______
100.00 % 96.73 % = TOTAL OXIDE
Empirical Formula:
Ca0.6 Mn2+ 0.3 Fe2+ 0.1 Fe3+ 3 (AsO4 )(PO4 )3 (PO3 )(OH)
Environment:
Secondary phosphate mineral.
IMA Status:
Approved IMA 1984
Locality:
White Elephant mine, Pringle, Custer County, South Dakota, USA. Link to MinDat.org Location Data.
Name Origin:
Named for Kurt Walenta (1927-), mineralogist, University of Stuttgart, Germany, who has studied many phosphate minerals.
Name Pronunciation:
Walentaite + Pronunciation
Walentaite Image
Images:
Walentaite
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
Axial Ratios:
a:b:c =2.5451:1:0.7158
Cell Dimensions:
a = 26.24, b = 10.31, c = 7.38, Z = 5; V = 1,996.54 Den(Calc)= 3.05
Crystal System:
Orthorhombic Space Group: I mmm, I bam, I bca, I mma
X Ray Diffraction:
By Intensity(I/Io ): 12.9(1), 3(0.5), 4.43(0.3),
Physical Properties of Walentaite
Cleavage:
{010} Perfect
Color:
Greenish yellow, Yellow green, Bright yellow.
Density:
2.72
Diaphaneity:
Translucent
Habit:
Rosette - Bundled tabular aggregates resembling rose flower petals.
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
yellow
Optical Properties of Walentaite
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
Optical Data:
Biaxial (+), b=1.738, g=1.779,
Pleochroism (x):
pale yellow green.
Pleochroism (y):
pale yellow green.
Pleochroism (z):
medium yellow green.
Calculated Properties of Walentaite
Electron Density:
Bulk Density (Electron Density)=2.94 gm/cc note: Specific Gravity of Walentaite =3.05 gm/cc.
Fermion Index:
Fermion Index = 0.0052578726 Boson Index = 0.9947421274
Photoelectric:
PEWalentaite = 15.79 barns/electronU=PEWalentaite x r Electron Density= 46.51 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Walentaite is Not Radioactive
Walentaite Classification
Dana Class:
40.05.10.01 (40) Hydrated Phosphates, etc
(40.05) with miscellaneous formulae
(40.05.10) Dana Group
40.05.10.01 Walentaite (Ca,Mn,Fe)Fe3(AsO4)(PO4)3(PO3OH) I mmm, I bam, I bca, I mma Ortho
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
References:
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
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
Search for Walentaite using:
[AOL ]
[Bing ]
[Dog Pile ]
[GeoScienceWorld ]
[HotBot ]
[Ixquick ]
[Lycos ]
[MAMMA ]
[Scirus ]
[Teoma ]
[WebCrawler ]
[Wikipedia ]
[YAHOO ]
Visit our Advertisers for Walentaite :
Ask about Walentaite 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
Espa�ol
Print or Cut-and-Paste your Walentaite Specimen Label here :
Walentaite
(Ca,Mn++,Fe++)Fe+++3(AsO4)(PO4)3(PO3OH)
Dana No: 40.05.10.01 Strunz No: 08.CH.05
Locality:
Notes:
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.