General Kottigite Information
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Chemical Formula: |
Zn3(AsO4)2ˇ8(H2O) |
Composition: |
Molecular Weight = 618.13 gm |
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Zinc 31.74 % Zn 39.50 % ZnO |
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Arsenic 24.24 % As 37.18 % As2O5 |
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Hydrogen 2.61 % H 23.32 % H2O |
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Oxygen 41.41 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Zn3(AsO4)2ˇ8(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 |
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Kottigite Image |
Images:
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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 |
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Kottigite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 6.703(1), 3.224(0.35), 7.954(0.27), |
Forms:
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Forms:
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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
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Physical Properties of Kottigite
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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 |
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Optical Properties of Kottigite
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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. |
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Calculated Properties of Kottigite
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Electron Density: |
relectron=3.16 gm/cc note: rKottigite =3.26 gm/cc. |
Fermion Index |
Fermion Index = 0.01321 Boson Index = 0.98679 |
Photoelectric: |
PEKottigite = 31.88 barns/electron U=PEKottigite x relectron= 100.89 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Kottigite is Not Radioactive |
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Kottigite Classification
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Dana Class: |
40.3.6.5 (40)Hydrated Phosphates, etc |
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(40.3)where (A++)3 (XO4)2 ˇ x(H2O) |
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(40.3.6)Dana Group |
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40.3.6.1 Vivianite Fe3(PO4)2ˇ8(H2O) C 2/m 2/m |
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40.3.6.2 Baricite (Mg,Fe)3(PO4)2ˇ8(H2O) C 2/m 2/m |
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40.3.6.3 Erythrite Co3(AsO4)2ˇ8(H2O) I2/m 2/m |
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40.3.6.4 Annabergite Ni3(AsO4)2ˇ8(H2O) I2/m 2/m |
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40.3.6.5 Kottigite Zn3(AsO4)2ˇ8(H2O) C 2/m 2/m |
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40.3.6.6 Parasymplesite Fe3(AsO4)2ˇ8(H2O) C 2/m 2/m |
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40.3.6.7 Hornesite Mg3(AsO4)2ˇ8(H2O) I2/m 2/m |
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40.3.6.8 Arupite (Ni,Fe)3(PO4)2ˇ8(H2O) I2/m 2/m |
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40.3.6.9 IMA2004-021! Co3(PO4)2ˇ8(H2O) C 2/m 2/m |
Strunz Class: |
VII/C.13-90 VII - Phosphates, Arsenates and Vanadates |
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VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg |
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VII/C.13 - Vivianite group |
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VII/C.13-10 Bobierrite Mg3(PO4)2ˇ8(H2O) C 2/c 2/m |
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VII/C.13-20* Cattiite! Mg3(PO4)2ˇ22(H2O) P1 1 |
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VII/C.13-20 Manganese-hornesite (Mn,Mg)3(AsO4)2ˇ8(H2O) P 21/c 2/m |
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VII/C.13-30 Baricite (Mg,Fe)3(PO4)2ˇ8(H2O) C 2/m 2/m |
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VII/C.13-40 Vivianite Fe3(PO4)2ˇ8(H2O) C 2/m 2/m |
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VII/C.13-45 Arupite (Ni,Fe)3(PO4)2ˇ8(H2O) I2/m 2/m |
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VII/C.13-50 Hornesite Mg3(AsO4)2ˇ8(H2O) I2/m 2/m |
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VII/C.13-60 Parasymplesite Fe3(AsO4)2ˇ8(H2O) C 2/m 2/m |
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VII/C.13-70 Erythrite Co3(AsO4)2ˇ8(H2O) I2/m 2/m |
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VII/C.13-80 Annabergite Ni3(AsO4)2ˇ8(H2O) I2/m 2/m |
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VII/C.13-90 Kottigite Zn3(AsO4)2ˇ8(H2O) C 2/m 2/m |
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Other Kottigite Information
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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 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - WWW-MINCRYST
14 -École des Mines de Paris
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Kottigite
Zn3(AsO4)2ˇ8(H2O)
Dana No: 40.3.6.5 Strunz No: VII/C.13-90
Locality:
Notes:
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