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Ekatite (Ekatit)

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Ekatit
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Ekatit
stengeliges Aggregat von Ekatit, Tsumeb Mine, Namibia; BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine
Mineral: Ekatite
Image: 1602086347
License: Usage for Mineralienatlas project only
Ekatit

stengeliges Aggregat von Ekatit, Tsumeb Mine, Namibia; BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-10-07
Locality: Tsumeb Mine / Tsumeb / Oshikoto (Otjikoto), Region / Namibia

Collectors Summary

Color bräunlichschwarz
Streak color braun
Lustre Glasglanz
Hardness (Mohs) 3
Cleavages keine
Crystal System hexagonal, P63mc

Chemism

Chemical formula

(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,SiO3OH)2(OH)6

Chemical composition

Arsen, Eisen, Silicium, Zink, Sauerstoff, Wasserstoff

Unit weight: 1752.1084905 u; Number of atoms in the formula: 57

Info

Empirical formula:

(Fe0.6Fe0.3Zn0.1)12(AsO3)6((AsO3)0.75(SiO3OH)0.25)2(OH)6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.37

6.5

11.40

1.0079470

6.5516555
Oxygen

O

27.85

30.5

53.51

15.9994300

487.9826150
Silicon

Si

0.80

0.5

0.88

28.0855300

14.0427650
Iron

Fe

34.42

10.8

18.95

55.8452000

603.1281600
Zinc

Zn

4.48

1.2

2.11

65.4094000

78.4912800
Arsenic

As

32.07

7.5

13.16

74.9216020

561.9120150

Strunz 9th edition incl. updates

4.JB.75

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
J: Antimonite, Bismuthite, Sulfite, Selenite, Tellurite
B: [Arsenite], [Antimonite], [Bismuthite]; mit zusätzlichen [Anionen], ohne H20
75:Ekatit-Gruppe

Lapis Classification

IV/J.04-050

IV: OXIDE
J: Arsenite (mit As3+)
4: Arsenite mit [AsO3] 3--Inseln

Classification by Hölzel

5.JB.180

5: CARBONATES NITRATES ARSENITES SULFITES SELENITES TELLURITES IODATES
J: Arsenites
B: Arsenites (+Anions -Water)

Dana 8th edition

43.04.10.02

43: Compound Phosphates, etc.
04: Compound Phosphates, etc. (Anhydrous Compound Anions With Hydroxyl or Halogen)
10: Kraisslite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

bräunlichschwarz

Streak color

braun

Diaphaneity (Transparency)

durchscheinend

Lustre

Glasglanz

max. Birefringence

0.070
Birefringence chart\! Ekatite title=Birefringence chart Ekatite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.99

RI value γ / ε

2.08

Ri mean

2.020

2V angle

Uniaxial (+)

Pleochroism

deutlich; O = dunkelschwarzbraun, E = braun

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

hexagonal

Class (H-M)

6mm

Space Group number

186

Space Group

P63mc

Cell parameters a (Å)

12.773

Cell parameters b (Å)

-

Cell parameters c (Å)

5.051

Cell parameters a/b or c/a

0.395

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

1

Volumne (ų)

713.664

X-Ray Powder Diffraction

6.37(80),
3.221(100),
2.531(40),
2.420(70),
1.788(40),
1.672(50),
1.507(50)
XRD chart Ekatite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3

VHN (Hardness Vickers)

83 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.061 (berechnet)

4.077 ( ρ calc. Mineralienatlas )

Cleavages

keine

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine

Type material

Archiv der Universität Stuttgart, "Mineralogische Sammlung Prof. Keller"

Collection number of type material

TM-98.24-Gro19 / 0/824-s27/2

Paragenesis of type material

Chalkosin, Quarz

Preface

Associations

Chalkosin, Quarz

Author (Name, Year)

Keller, 2001

References

European Journal of Mineralogy 13 (2001), 769

Other languages

German

Ekatit

Spanish

Ekatita

French

Ekatite

English

Ekatite

Russian

Экатит

Simplified Chinese

羟硅砷铁石

Traditional Chinese

羥矽砷鐵石

Japanese

ｴｶﾀｲﾄ

CNMNC (IMA)-Number

IMA 1998-024

CNMNC symbol

Symbol

Ekt

Locations with GPS information