Kottigite Mineral Data
General Kottigite Information
Chemical Formula:
Zn3(AsO4)2•8(H2O)
Composition:
Molecular Weight = 618.13 gm
Zinc 31.74 % Zn 39.50 % ZnO
Arsenic 24.24 % As 37.18 % As2 O5
Hydrogen 2.61 % H 23.32 % H2 O
Oxygen 41.41 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Zn3 (AsO4 )2 •8(H2 O)
Environment:
Alteration of smaltite and sphalerite. Forms a series with erythrite and annabergite.
IMA Status:
Valid Species (Pre-IMA) 1850
Locality:
Daniel mine, Scheeberg, Saxony, Germany. Link to MinDat.org Location Data.
Name Origin:
Named for Otto K�ttig (1824-?), chemist of Schneeberg, Saxony, Germany.
Name Pronunciation:
Kottigite + Pronunciation
Synonym:
Koettigite
Kottigite Image
Images:
Kottigite
Comments: Köttigite crystals on gossanous matrix up to 0.5 cm in length.
Location: Oujela Mine, Mapimi, Durango, Mexico.
Scale: Picture size 3 cm.
© John Veevaert
Kottigite Crystallography
Axial Ratios:
a:b:c =0.7639:1:0.3548
Cell Dimensions:
a = 10.241, b = 13.405, c = 4.757, Z = 2; beta = 105.21° V = 630.17 Den(Calc)= 3.26
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
X Ray Diffraction:
By Intensity(I/Io ): 6.703(1), 3.224(0.35), 7.954(0.27),
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Physical Properties of Kottigite
Color:
Red, Brownish.
Density:
3.33
Diaphaneity:
Translucent
Habit:
Encrustations - Forms crust-like aggregates on matrix.
Habit:
Massive - Fibrous - Distinctly fibrous fine-grained forms.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
2.5-3 - Finger Nail-Calcite
Luster:
Silky
Optical Properties of Kottigite
Gladstone-Dale:
CI meas = 0.043 (Good) - where the CI = (1-KPDmeas /KC ) CI calc = 0.022 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1974,KPDmeas = 0.1933,KC = 0.2019 Ncalc = 1.66 - 1.67
Optical Data:
Biaxial (+), a=1.622, b=1.638, g=1.671, bire=0.0490, 2V(Calc)=72, 2V(Meas)=74.
Calculated Properties of Kottigite
Electron Density:
Bulk Density (Electron Density)=3.16 gm/cc note: Specific Gravity of Kottigite =3.26 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEKottigite = 31.88 barns/electronU=PEKottigite x r Electron Density= 100.89 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Kottigite is Not Radioactive
Kottigite Classification
Dana Class:
40.03.06.05 (40) Hydrated Phosphates, etc
(40.03) where (A++)3 (XO4)2 � x(H2O)
(40.03.06) Vivianite Group
40.03.06.01 Vivianite Fe3(PO4)2•8(H2O) C 2/m 2/m
40.03.06.02 Baricite (Mg,Fe)3(PO4)2•8(H2O) C 2/m 2/m
40.03.06.03 Erythrite Co3(AsO4)2•8(H2O) I2/m 2/m
40.03.06.04 Annabergite Ni3(AsO4)2•8(H2O) I2/m 2/m
40.03.06.05 Kottigite Zn3(AsO4)2•8(H2O) C 2/m 2/m
40.03.06.06 Parasymplesite Fe3(AsO4)2•8(H2O) C 2/m 2/m
40.03.06.07 Hornesite Mg3(AsO4)2•8(H2O) I2/m 2/m
40.03.06.08 Arupite (Ni,Fe)3(PO4)2•8(H2O) I2/m 2/m
40.03.06.09 Pakhomovskyite ! Co3(PO4)2•8(H2O) C 2/m 2/m
Strunz Class:
08.CE.40 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.40 Arupite (Ni,Fe)3(PO4)2•8(H2O) I2/m 2/m
08.CE.40 Annabergite Ni3(AsO4)2•8(H2O) I2/m 2/m
08.CE.40 Baricite (Mg,Fe)3(PO4)2•8(H2O) C 2/m 2/m
08.CE.40 Erythrite Co3(AsO4)2•8(H2O) I2/m 2/m
08.CE.40 Ferrisymplesite Fe3(AsO4)2(OH)3•5(H2O) None
08.CE.40 Hornesite Mg3(AsO4)2•8(H2O) I2/m 2/m
08.CE.40 Kottigite Zn3(AsO4)2•8(H2O) C 2/m 2/m
08.CE.40 Manganohornesite (Mn,Mg)3(AsO4)2•8(H2O) P 21 /c 2/m
08.CE.40 Parasymplesite Fe3(AsO4)2•8(H2O) C 2/m 2/m
08.CE.40 Vivianite Fe3(PO4)2•8(H2O) C 2/m 2/m
08.CE.40 Pakhomovskyite ! Co3(PO4)2•8(H2O) C 2/m 2/m
Other Kottigite Information
References:
NAME( Athena) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Kottigite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST
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Kottigite
Zn3(AsO4)2•8(H2O)
Dana No: 40.03.06.05 Strunz No: 08.CE.40
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