Straczekite Mineral Data + 
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- 47.3.2.1 Straczekite (Ca,K,Ba)2V8O20·3(H2O) C 2/m 2/m
- 47.3.2.2 Corvusite (Na,Ca,K)V8O20·4(H2O) C 2/m 2/m
- 47.3.2.3 Fernandinite CaV8O20·4(H2O) C 2/m 2/m
- 47.3.2.4 Bariandite Al0.6V8O20·9(H2O) C 2/c 2/m
- 47.3.2.5 Bokite (Al,Fe)1.3(V,Fe)8O20·4.7(H2O) C 2/m 2/m
- 47.3.2.6 Kazakhstanite Fe5V3V12O39·8.5(H2O) C 2/m 2/m
- IV/G.11-10 Bariandite Al0.6V8O20·9(H2O) C 2/c 2/m
- IV/G.11-20 Bokite (Al,Fe)1.3(V,Fe)8O20·4.7(H2O) C 2/m 2/m
- IV/G.11-30 Straczekite (Ca,K,Ba)2V8O20·3(H2O) C 2/m 2/m
- IV/G.11-35 Fernandinite CaV8O20·4(H2O) C 2/m 2/m
- IV/G.11-40 Corvusite (Na,Ca,K)V8O20·4(H2O) C 2/m 2/m
General Straczekite Information |
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 Chemical Formula: |
(Ca,K,Ba)2V8O20·3(H2O) | ||
| Composition: |
Molecular Weight = 880.68 gm | ||
| Potassium 2.22 % K 2.67 % K2O | |||
| Barium 3.12 % Ba 3.48 % BaO | |||
| Calcium 5.92 % Ca 8.28 % CaO | |||
| Vanadium 46.27 % V 82.61 % V2O5 | |||
| Hydrogen 0.69 % H 6.14 % H2O | |||
| Oxygen 41.78 % O | |||
| ______ ______ | |||
| 100.00 % 103.18 % = TOTAL OXIDE | |||
| Empirical Formula: |
Ca1.3K0.5Ba0.2V5+8O20·3(H2O) | ||
| IMA Status: |
Approved IMA 1983 | ||
| Locality: |
Union Carbide mine, Wilson Springs, Arkansas. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for John A. Straczed (1914-), U. S. Geologist. | ||
Straczekite Image | |||
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Images:
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Straczekite Crystallography |
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| Axial Ratios: |
a:b:c =3.1902:1:2.9053 | ||
| Cell Dimensions: |
a = 11.679, b = 3.6608, c = 10.636, Z = 1; beta = 100.53° V = 447.08 Den(Calc)= 3.27 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.486(1), 1.8306(0.5), 10.449(0.5), | ||
Physical Properties of Straczekite |
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| Cleavage: |
[100] Perfect | ||
| Color: |
Greenish black. | ||
| Density: |
3.19 - 3.21, Average = 3.2 | ||
| Habit: |
Fibrous - Crystals made up of fibers. | ||
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. | ||
| Hardness: |
1-2 - Between Talc and Gypsum | ||
| Luster: |
Greasy (Oily) | ||
| Streak: |
greenish black | ||
Optical Properties of Straczekite |
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| Gladstone-Dale: |
CI meas= 0.05 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.07 (Fair) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.3058,KPDmeas= 0.3125,KC= 0.3288 |
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| Optical Data: |
Biaxial (-), a=2, 2V(Meas)=large. | ||
| Pleochroism (x): |
green. | ||
| Pleochroism (y): |
green. | ||
| Pleochroism (z): |
green. | ||
Calculated Properties of Straczekite |
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| Electron Density: |
relectron=3.06 gm/cc |
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| Fermion Index |
Fermion Index = 0.00699 Boson Index = 0.99301 |
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| Photoelectric: |
PEStraczekite = 22.98 barns/electron |
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| Radioactivity: |
GRapi = 30.62 (Gamma Ray American Petroleum Institute Units) Estimated Radioactivity from Straczekite |
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Straczekite Classification |
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| Dana Class: |
47.3.2.1 (47)Vanadium Oxysalts | ||
| (47.3)(Hydrated) | |||
| (47.3.2)Dana Group | |||
| Strunz Class: |
IV/G.11-30 IV - Oxides | ||
| IV/G - Vanadiumoxides (with V4+/5+) Layered vanadates. Typical Vanadiumbronzes | |||
| IV/G.11 - Bariandite - Corvusite-? series | |||
Other Straczekite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) | ||
| See Also: |
Links to other databases for Straczekite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris Search for Straczekite using: Visit our Advertisers for Straczekite : Translate Straczekite Mineral Data : Ask about Straczekite here : Print or Cut-and-Paste your Straczekite Specimen Label here :
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- barely detectable 
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