Kaatialaite Mineral Data

Kaatialaite Mineral Data +

General Kaatialaite Information

Chemical Formula:

Fe+++[H2As+++++O4]3·5-5.5(H2O)

Composition:

Molecular Weight = 577.74 gm

Iron 9.67 % Fe 13.82 % Fe₂O₃

Arsenic 38.90 % As 59.67 % As₂O₅

Hydrogen 2.97 % H 26.51 % H₂O

Oxygen 48.46 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺3(H₂)3(AsO₄)·5.5(H₂O)

IMA Status:

Approved IMA 1984

Locality:

Kaatiala granite pegmatite, Kuortane, western Finland. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 15550

PDF 43-681

Kaatialaite Image

Images:

Kaatialaite

Comments: White kaatialaite with arsenolite on native arsenic.
Location: Shaft 371, Schlema-Hartenstein area, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Kaatialaite Crystallography

Axial Ratios:

a:b:c =0.7747:1:0.24

Cell Dimensions:

a = 15.34, b = 19.8, c = 4.752, Z = 4; beta = 91.9° V = 1,442.54 Den(Calc)= 2.66

Crystal System:

MonoclinicSpace Group: P 2₁,P 2₁/m

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

By Intensity(I/I_o): 8.35(1), 9.91(0.6), 7.72(0.5),

Physical Properties of Kaatialaite

Color:

Greenish blue, Gray, Yellow, White.

Density:

2.64

Diaphaniety:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Streak:

white

Optical Properties of Kaatialaite

Gladstone-Dale:

CI meas= 0.023 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2234,KPDmeas= 0.2251,KC= 0.2303

Optical Data:

Biaxial (+), a=1.573, b=1.574, g=1.636, bire=0.0630, 2V(Calc)=16, 2V(Meas)=15.

Calculated Properties of Kaatialaite

Electron Density:

r_electron=2.58 gm/cc
note: r_Kaatialaite=2.64 gm/cc.

Fermion Index

Fermion Index = 0.00228
Boson Index = 0.99772

Photoelectric:

PE_Kaatialaite= 28.79 barns/electron
U=PE_Kaatialaite x r_electron= 74.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kaatialaite is Not Radioactive

Kaatialaite Classification

Dana Class:

39.3.9.1 (39)Hydrated Acid Phosphates, etc

(39.3)with miscellaneous formulae

(39.3.9)Dana Group

39.3.9.1 Kaatialaite Fe[H2AsO4]3·5-5.5(H2O) P 2₁,P 2₁/m Mono

Strunz Class:

VII/C.05-10 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.05 - Kaatialaite - Sterlinghillite series

VII/C.05-10 Kaatialaite Fe[H2AsO4]3·5-5.5(H2O) P 2₁,P 2₁/m Mono

VII/C.05-20 Krautite MnAsO3(OH)2·(H2O) P 2₁ 2

VII/C.05-30 Sterlinghillite Mn3(AsO4)2·3(H2O) Mono Mono

Other Kaatialaite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Kaatialaite :
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 -École des Mines de Paris

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

Kaatialaite

Fe+++[H2As+++++O4]3·5-5.5(H2O)
Dana No: 39.3.9.1 Strunz No: VII/C.05-10
Locality:

Notes: