| Ekatite Mineral Data |
[Welcome] [Newest Minerals] [Gallery] [About Us] [How to Buy]
We are www.minernet.it, an Italian company which deals rare, unusual,
and showy mineral specimens. We specialise in minerals from Tsumeb,
Mont Saint Hilaire, Bolivia and Major Italian sites.
- 43.4.10.1 Kraisslite (Mn,Mg)24Zn3Fe(AsO3)2(AsO4)3(SiO4)6(OH)18 P 6322 6 2 2
- 43.4.10.2 Ekatite ! (Fe,Fe,Zn)12(OH)6[AsO3]6[AsO3,HOSiO3]2 P 63mc 6mm
- IV/J.04-10 Zimbabweite Na(Pb,Na,K)2(Ta,Nb,Ti)4As4O18 Ccmb 2/m 2/m 2/m
- IV/J.04-50 Ekatite (Fe,Fe,Zn)12(OH)6[AsO3]6[AsO3,HOSiO3]2 P 63mc 6mm
General Ekatite Information |
|||
 Chemical Formula: |
(Fe+++,Fe++,Zn)12(OH)6[AsO3]6[AsO3,HOSiO3]2 | ||
| Composition: |
Molecular Weight = 1,761.38 gm | ||
| Zinc 2.97 % Zn 3.70 % ZnO | |||
| Iron 35.51 % Fe 21.21 % FeO / 27.20 % Fe2O3 | |||
| Silicon 0.96 % Si 2.05 % SiO2 | |||
| Arsenic 32.33 % As 42.68 % As2O3 | |||
| Hydrogen 0.35 % H 3.12 % H2O | |||
| Oxygen 27.89 % O | |||
| ______ ______ | |||
| 100.00 % 99.95 % = TOTAL OXIDE | |||
| Empirical Formula: |
Fe3+6Fe2+5.2Zn0.8(OH)6.1(AsO3)7.6(SiO3)0.6 | ||
| Environment: |
Oxidation product occurring on a matrix of chalcocite and etched quartz. | ||
| IMA Status: |
Approved IMA 1998 (Dana # Added) | ||
| Locality: |
Tsumeb mine, Namibia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Dieter Ekat (1935-1996), Namibian mining engineer. | ||
| Synonym: |
IMA1998-024 | ||
Search for Ekatite Images | |||
|
Images:
|
|
||
Ekatite Crystallography |
|||
| Axial Ratios: |
a:c = 1:0.39544 | ||
| Cell Dimensions: |
a = 12.773, c = 5.051, Z = 1; V = 713.66 Den(Calc)= 4.10 | ||
| Crystal System: |
Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 63mc | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.22(1)(211,220), 2.42(0.7)(401,410), 6.37(0.5)(110),1.788(0.4), 2.531(0.4), 2.766(0.3)(400), 11.11(0.3)(100), 1.507(0.3)(701,431), 1.672(0.3)(521), | ||
|
Crystal Structure:
Mouse |
| ||
Physical Properties of Ekatite |
|||
| Cleavage: |
None | ||
| Color: |
Brownish black. | ||
| Diaphaniety: |
Transparent | ||
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
| Habit: |
Acicular - Occurs as needle-like crystals. | ||
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. | ||
| Habit: |
Striated - Parallel lines on crystal surface or cleavage face. | ||
| Hardness: |
3 - Calcite | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
brown | ||
Optical Properties of Ekatite |
|||
| Optical Data: |
Uniaxial (+), w=1.99, e=2.08, bire=0.0900. | ||
Calculated Properties of Ekatite |
|||
| Electron Density: |
relectron=3.85 gm/cc |
||
| Fermion Index |
Fermion Index = 0.00932 Boson Index = 0.99068 |
||
| Photoelectric: |
PEEkatite = 34.84 barns/electron |
||
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Ekatite is Not Radioactive |
||
Ekatite Classification |
|||
| Dana Class: |
43.4.10.2 (43)Compound Phosphates, etc. | ||
| (43.4)(Anhydrous Compound Anions With Hydroxyl or Halogen) | |||
| (43.4.10)Dana Group | |||
| Strunz Class: |
IV/J.04-50 IV - Oxides | ||
| IV/J - Arsenides with [AsO3]3- groups | |||
| IV/J.04 - Zimbabweite series | |||
Other Ekatite Information |
|||
| References: |
NAME( AmMin, Vol 87, p 355) PHYS. PROP.(AmMin, Vol 87, p 355) OPTIC PROP.(AmMin, Vol 87, p 355) | ||
| See Also: |
Links to other databases for Ekatite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas Search for Ekatite using: Visit our Advertisers for Ekatite : Translate Ekatite Mineral Data : Ask about Ekatite here : Print or Cut-and-Paste your Ekatite Specimen Label here :
|
||
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |