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Ekatite

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About EkatiteHide

Formula:
(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6
Colour:
Brownish black
Lustre:
Vitreous
Hardness:
3
Crystal System:
Hexagonal
Name:
Named in honor of Dieter Ekat (1935-1996), a Namibian mining engineer and owner of the Rubikon Mine.
This page provides mineralogical data about Ekatite.


Classification of EkatiteHide

Approved
4.JB.75

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
B : Arsenites, antimonites, bismuthites; with additional anions, without H2O

Pronounciation of EkatiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of EkatiteHide

Vitreous
Colour:
Brownish black
Streak:
Brown
Hardness:

Optical Data of EkatiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.990 nε = 2.080
Max Birefringence:
δ = 0.090
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of EkatiteHide

Formula:
(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6
IMA Formula:
(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,SiO3OH)2(OH)6

Crystallography of EkatiteHide

Crystal System:
Hexagonal

Type Occurrence of EkatiteHide

Synonyms of EkatiteHide

Other Language Names for EkatiteHide

German:Ekatit
Russian:Экатит
Simplified Chinese:羟硅砷铁石
Spanish:Ekatita
Traditional Chinese:羥矽砷鐵石

Related Minerals - Nickel-Strunz GroupingHide

4.JB.05Fetiasite(Fe3+,Fe2+,Ti)3(As2O5)O2Mon.
4.JB.10ManganarsiteMn3(As2O4)(OH)4
4.JB.15MagnussoniteMn10As6O18(OH,Cl)2Iso. m3m (4/m 3 2/m) : Ia3d
4.JB.15UM1984-09-AsO:ClHMnMn10As6O18(OH)ClTet. 4/mmm (4/m 2/m 2/m) : I41/acd
4.JB.20ArmangiteMn2+26(AsO3)14(HAsO3)4(CO3)Trig. 3 : P3
4.JB.25NanlingiteNa(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14Trig.
4.JB.30AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2Trig. 3m : P3c1
4.JB.35StenhuggariteCaFeSb(AsO3)2OTet.
4.JB.40TrigonitePb3Mn2+(AsO3)2(HAsO3)Mon. m
4.JB.45FinnemanitePb5(AsO3)3ClHex. 6/m : P63/m
4.JB.50GebharditePb8(As2O5)2OCl6Mon.
4.JB.55DerbyliteFe3+4Ti3Sb3+O13(OH)Mon. 2/m : P21/m
4.JB.55Tomichite(V,Fe)4Ti3AsO13(OH)Mon.
4.JB.55Graeserite(Fe3+ ,Ti)4Ti3AsO13(OH)Mon.
4.JB.60Hemloite(Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH)Tric. 1 : P1
4.JB.65FreediteCu+Pb8(AsO3)2O3Cl5Mon. 2/m : B2/m
4.JB.70GeorgiadèsitePb4(AsO3)Cl4(OH)Mon.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for EkatiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Keller, P. (2001): Ekatite, (Fe3+,Fe2+,Zn)12(OH)6[AsO3]6[AsO 3,HOSiO3]2, a new mineral from Tsumeb, Namibia, and its crystal structure. European Journal of Mineralogy: 13, 769-777.

Internet Links for EkatiteHide

Localities for EkatiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Namibia (TL)
 
  • Oshikoto Region (Otjikoto Region)
    • Tsumeb
[European Journal of Mineralogy 13 (2001), 769; MinRec 33:162]
Mineral and/or Locality  
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