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 % 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

Empirical Formula:

Ca_0.6Mn²⁺_0.3Fe²⁺_0.1Fe³⁺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:

OrthorhombicSpace Group: I mmm, I bam, I bca, I mma

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_Walentaite= 15.79 barns/electron
U=PE_Walentaite x rElectron 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

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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 Español

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: