Kottigite Mineral Data

Kottigite Mineral Data +

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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 % As₂O₅

Hydrogen 2.61 % H 23.32 % H₂O

Oxygen 41.41 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn₃(AsO₄)₂·8(H₂O)

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 Köttig (1824-?), chemist of Schneeberg, Saxony, Germany.

Synonym:

Koettigite

Kottigite Image

Images:

Kottigite

Comments: K?ttigite 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 - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 6.703(1), 3.224(0.35), 7.954(0.27),

Forms:

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Forms: [ 1 0 0] [ 0 1 0] [ 2 2 1] [ 2 0 1] [ 1 1 0]

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Crystal Structure:

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Hill R J , American Mineralogist , 64 (1979) p.376-382, The crystal structure of kottigite

Physical Properties of Kottigite

Color:

Red, Brownish.

Density:

3.33

Diaphaniety:

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

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:

r_electron=3.16 gm/cc
note: r_Kottigite=3.26 gm/cc.

Fermion Index

Fermion Index = 0.01321
Boson Index = 0.98679

Photoelectric:

PE_Kottigite= 31.88 barns/electron
U=PE_Kottigite x r_electron= 100.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kottigite is Not Radioactive

Kottigite Classification

Dana Class:

40.3.6.5 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.6)Dana Group

40.3.6.1 Vivianite Fe3(PO4)2·8(H2O) C 2/m 2/m

40.3.6.2 Baricite (Mg,Fe)3(PO4)2·8(H2O) C 2/m 2/m

40.3.6.3 Erythrite Co3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.4 Annabergite Ni3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.5 Kottigite Zn3(AsO4)2·8(H2O) C 2/m 2/m

40.3.6.6 Parasymplesite Fe3(AsO4)2·8(H2O) C 2/m 2/m

40.3.6.7 Hornesite Mg3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.8 Arupite (Ni,Fe)3(PO4)2·8(H2O) I2/m 2/m

40.3.6.9 IMA2004-021! Co3(PO4)2·8(H2O) C 2/m 2/m

Strunz Class:

VII/C.13-90 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.13 - Vivianite group

VII/C.13-10 Bobierrite Mg3(PO4)2·8(H2O) C 2/c 2/m

VII/C.13-20* Cattiite! Mg3(PO4)2·22(H2O) P1 1

VII/C.13-20 Manganese-hornesite (Mn,Mg)3(AsO4)2·8(H2O) P 2₁/c 2/m

VII/C.13-30 Baricite (Mg,Fe)3(PO4)2·8(H2O) C 2/m 2/m

VII/C.13-40 Vivianite Fe3(PO4)2·8(H2O) C 2/m 2/m

VII/C.13-45 Arupite (Ni,Fe)3(PO4)2·8(H2O) I2/m 2/m

VII/C.13-50 Hornesite Mg3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-60 Parasymplesite Fe3(AsO4)2·8(H2O) C 2/m 2/m

VII/C.13-70 Erythrite Co3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-80 Annabergite Ni3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-90 Kottigite Zn3(AsO4)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)

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Kottigite

Zn3(AsO4)2·8(H2O)
Dana No: 40.3.6.5 Strunz No: VII/C.13-90
Locality:

Notes: