General Information
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Chemical Formula: |
K3Na8Fe+++(SO4)6(NO3)2·6(H2O) |
Composition: |
Molecular Weight = 1,109.70 gm) |
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Empirical Formula: |
K3Na8(SO4)6(NO3)2·6(H2O) |
Locality: |
Chuquicamata, Antofagasta, Chile. |
Name Origin: |
Named for Henri-Leon Ungemach (1880-1936), Belgian crystallographer. |
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Classification
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Dana Class: |
32.2.3.1 (32)Compound Sulfates |
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(32.2)(hydrous) with simple bi-anionic formula |
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(32.2.3)Dana Group |
Strunz Class: |
VI/D.16-20 VI - Sulfates,Chromates,Molybdates and Tungstates |
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VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size |
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VI/D.16 - Darapskite - Humberstonite series |
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Crystallography
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Axial Ratios: |
a:c = 1:2.29298 |
Cell Dimensions: |
a = 10.898, c = 24.989, Z = 3; V = 2,570.24 Den(Calc)= 2.15 |
Crystal System: |
Trigonal - Rhombohedral H-M Symbol ( -3) Space Group: R3- |
X Ray Diffraction: |
By Intensity(I/Io): 3.43(1) 8.33(0.6) 2.72(0.5) |
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Physical Properties
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Cleavage: |
[0001] Perfect |
Color: |
colorless or light yellow. |
Density: |
2.287 |
Diaphaniety: |
Transparent |
Habits: |
Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals., , |
Hardness: |
2.5 - Finger Nail |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties
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Optical Data: |
Uniaxial (+), w=1.449, e=1.502, bire=0.0530. |
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Other Information
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References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Ungemachite :
1 -American Mineralogist Crystal Structure Database
2 -Athena Mineralogy
3 - EUROmin Project
4 -MinDat.org Location Data
5 -MinMax
6 -WWW-MINCRYST
7 -École des Mines de Paris
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