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Straczekite (Straczekit)

Pictures (2 Images total)

Straczekit
Views (File:
1216386103
): 1097
Straczekit
FO: Union Carbide Vanadium Mine, Wilson Springs, Garland Co., Arkansas, USA; schwarze, rosettenartig aufgewachsene Kristalle; BB: 2,0 mm
Copyright: pikosteine; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A002419, Donator: Klaus Fleck
Location: USA/Arkansas/Garland Co./Wilson Springs/Union Carbide Vanadium Mine
Mineral: Straczekite
Image: 1216386103
Rating: 4 (votes: 2)
License: Usage for Mineralienatlas project only
Straczekit (SNr: A002419)

FO: Union Carbide Vanadium Mine, Wilson Springs, Garland Co., Arkansas, USA; schwarze, rosettenartig aufgewachsene Kristalle; BB: 2,0 mm
Collection: Lithothek der Münchener Micromounter
Copyright: pikosteine
Contribution: Münchener Micromounter 2008-07-18
Locality: Union Carbide Vanadium Mine / Wilson Springs / Garland Co. / Arkansas / USA
Straczekit
Views (File:
1634309432
): 106
Straczekit
Straczekit mit Duttonit & Fervanit; Fundort: USA/Arkansas/Garland Co./Wilson Springs/Union Carbide Vanadium Mine; Größe: 3,1 × 6,4 × 5,1 cm
Copyright: blackforestmining; Contribution: blackforestmining
Collection: blackforestmining
Location: USA/Arkansas/Garland Co./Wilson Springs/Union Carbide Vanadium Mine
Mineral: Straczekite
Image: 1634309432
License: Usage for Mineralienatlas project only
Straczekit

Straczekit mit Duttonit & Fervanit; Fundort: USA/Arkansas/Garland Co./Wilson Springs/Union Carbide Vanadium Mine; Größe: 3,1 × 6,4 × 5,1 cm
Collection: blackforestmining
Copyright: blackforestmining
Contribution: blackforestmining 2021-10-15
Locality: Union Carbide Vanadium Mine / Wilson Springs / Garland Co. / Arkansas / USA

You find additional Straczekit specimen at the Geolitho Museum

Collectors Summary

Color grünlichschwarz
Streak color grünlichschwarz
Hardness (Mohs) 3
Crystal System monoklin,

Chemism

Chemical formula

(Ca,K,Ba)2(V5+,V4+)8O20·3H2O

Chemical composition

Barium, Calcium, Kalium, Sauerstoff, Vanadium, Wasserstoff

Unit weight: 880.585258 u; Number of atoms in the formula: 39

Info

Empirical formula:

(Ca0.6K0.3Ba0.1)2(V0.75V0.25)8O20·3H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.69

6

15.38

1.0079470

6.0476820
Oxygen

O

41.79

23

58.97

15.9994300

367.9868900
Potassium

K

2.66

0.6

1.54

39.0983100

23.4589860
Calcium

Ca

5.46

1.2

3.08

40.0784000

48.0940800
Vanadium

V

46.28

8

20.51

50.9415100

407.5320800
Barium

Ba

3.12

0.2

0.51

137.3277000

27.4655400

Strunz 9th edition incl. updates

4.HE.20

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
H: V[5,6] Vanadate
E: Schichtvanadate (Phyllovanadate)
20:Straczekit-Gruppe

Lapis Classification

IV/G.11-030

IV: OXIDE
G: Vanadiumoxide (Polyvanadate mit V4+/5+)
11: Schichtvanadate, als typische Vanadiumbronzen

Classification by Hölzel

4.GA.800

4: OXIDES
G: Vanadin, Uranyl Oxides and Hydroxides
A: Vanadin Oxides and Hydroxides, VBronzes
8: Fibrous Bronzes Straczekite-Group

Dana 8th edition

47.03.02.01

47: Vanadium Oxysalts
03: Vanadium Oxysalts (Hydrated)
02: Straczekite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

grünlichschwarz

Streak color

grünlichschwarz

RI value α / ω / n

1.99

Ri mean

1.99

2V angle

Biaxial (-) 70°!

Crystallography

Crystal System

monoklin

Cell parameters a (Å)

11.679

Cell parameters b (Å)

3.661

Cell parameters c (Å)

10.636

Cell parameters a/b or c/a

3.190

Cell parameters c/b

2.905

Cell parameters α

90°

Cell parameters β

100.53

Cell parameters γ

90°

Z

1

Volumne (ų)

447.103

X-Ray Powder Diffraction

10.449(50),
5.740(10),
3.486(100),
3.255(10),
2.492(10),
1.944(10),
1.831(50),
1.803(10)
XRD chart Straczekite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3

VHN (Hardness Vickers)

83 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.19 (gemessen)

3.27 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

USA/Arkansas/Garland Co./Wilson Springs/Union Carbide Vanadium Mine/North Wilson pit

Preface

Author (Name, Year)

Evans & Nord & Marinenko & Milton, 1984

References

Mineralogical Magazine 48 (1984), 289

Other languages

German

Straczekit

Spanish

Straczekita

English

Straczekite

French

Straczekite

Japanese

ｽﾄﾗｸｾﾞｶｲﾄ

CNMNC (IMA)-Number

IMA 1983-028

CNMNC symbol

Symbol

Szk

Locations with GPS information