Kankite Mineral Data

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General Kankite Information

Chemical Formula:

Fe+++AsO4•3.5(H2O)

Composition:

Molecular Weight = 257.82 gm

Iron 21.66 % Fe 30.97 % Fe₂O₃

Arsenic 29.06 % As 44.57 % As₂O₅

Hydrogen 2.74 % H 24.46 % H₂O

Oxygen 46.54 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺(AsO₄)•3.5(H₂O)

Environment:

Found on the old (1200-1400) mine dumps.

IMA Status:

Approved IMA 1976

Locality:

Kank, Kutno Hora district, Stredocesky Kraj, Bohemia, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Kankite

Kankite Image

Images:

Kankite

Comments: Greenish botryoidal aggregates of kankite.
Location: Reiche Zeche Mine, Freiberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Kankite Crystallography

Axial Ratios:

a:b:c =1.075:1:0.4364

Cell Dimensions:

a = 18.803, b = 17.49, c = 7.633, Z = 16; beta = 92.71° V = 2,507.42 Den(Calc)= 2.73

Crystal System:

MonoclinicSpace Group: Unk

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

By Intensity(I/I_o): 12.8(1), 4.764(0.34), 2.63(0.29),

Physical Properties of Kankite

Color:

Yellow green.

Density:

2.7

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous - Dull

Optical Properties of Kankite

Gladstone-Dale:

CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2462,KPDmeas= 0.2489,KC= 0.2529
Ncalc = 1.68 - 1.69

Optical Data:

Biaxial (?), a=1.664, g=1.68, bire=0.0160

Calculated Properties of Kankite

Electron Density:

Bulk Density (Electron Density)=2.64 gm/cc
note: Specific Gravity of Kankite =2.70 gm/cc.

Fermion Index:

Fermion Index = 0.0048196964
Boson Index = 0.9951803036

Photoelectric:

PE_Kankite= 25.79 barns/electron
U=PE_Kankite x rElectron Density= 68.06 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kankite is Not Radioactive

Kankite Classification

Dana Class:

40.04.04.01 (40)Hydrated Phosphates, etc

(40.04)where A+++ XO4 · x(H2O)

(40.04.04)Dana Group

40.04.04.01 Kankite FeAsO4•3.5(H2O) Unk Mono

Strunz Class:

08.CE.60 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CE -With only medium-sized cations, RO4:H2O £ 1:2.5

08.CE.60 Kankite FeAsO4•3.5(H2O) Unk Mono

Other Kankite Information

References:

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

See Also:

Links to other databases for Kankite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Kankite

Fe+++AsO4•3.5(H2O)
Dana No: 40.04.04.01 Strunz No: 08.CE.60
Locality:

Notes: