Strakhovite Mineral Data + 
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- 64.3.2.1 Strakhovite NaBa3(Mn,Mn)4Si6O19(OH)3 P nma 2/m 2/m 2/m
- VIII/F.33-10 Davreuxite MnAl6Si4O17(OH)2 P 21/m 2/m
- VIII/F.33-20 Strakhovite NaBa3(Mn,Mn)4Si6O19(OH)3 P nma 2/m 2/m 2/m
General Strakhovite Information |
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 Chemical Formula: |
NaBa3(Mn++,Mn+++)4Si6O19(OH)3 | ||
| Composition: |
Molecular Weight = 1,178.25 gm | ||
| Barium 34.97 % Ba 39.04 % BaO | |||
| Sodium 1.95 % Na 2.63 % Na2O | |||
| Manganese 18.65 % Mn 18.06 % MnO / 7.38 % MnO2 | |||
| Silicon 14.30 % Si 30.60 % SiO2 | |||
| Hydrogen 0.26 % H 2.29 % H2O | |||
| Oxygen 29.87 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
NaBa3Mn2+3Mn4+Si6O19(OH)3 | ||
| Environment: |
At the contact between braunite ore and alkali basalt. | ||
| IMA Status: |
Approved IMA 1994 | ||
| Locality: |
The Ir-Nimi manganese deposit, Taikan Ridge, Far East, Russia. Link to MinDat.org Location Data. | ||
| Name Origin: |
For N. M Strakhov (1900-1978), for his contributions to the study of sedimentary ore deposits and phosphorites. | ||
| Synonym: |
ICSD 39582 | ||
| IMA1993-005 | |||
| PDF 46-1421 | |||
Search for Strakhovite Images | |||
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Images:
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Strakhovite Crystallography |
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| Axial Ratios: |
a:b:c =1.9093:1:0.5854 | ||
| Cell Dimensions: |
a = 23.42, b = 12.266, c = 7.181, Z = 4; V = 2,062.88 Den(Calc)= 3.79 | ||
| Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.655(1), 2.999(1), 3.303(0.9), | ||
Physical Properties of Strakhovite |
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| Cleavage: |
[110] Imperfect | ||
| Color: |
Black, Greenish black, Dark olive green. | ||
| Density: |
3.86 | ||
| Diaphaniety: |
Translucent | ||
| Fracture: |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. | ||
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
| Hardness: |
5-6 - Between Apatite and Orthoclase | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Vitreous - Greasy | ||
| Streak: |
green | ||
Optical Properties of Strakhovite |
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| Optical Data: |
Biaxial (+), a=1.767, b=1.793, g=1.871, bire=0.1040, 2V(Calc)=64, 2V(Meas)=60-65. Dispersion strong, r > v. | ||
| Pleochroism (x): |
light green or light green. | ||
| Pleochroism (y): |
green or green. | ||
| Pleochroism (z): |
dark olive green or brown. | ||
Calculated Properties of Strakhovite |
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| Electron Density: |
relectron=3.49 gm/cc |
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| Fermion Index |
Fermion Index = 0.06913 Boson Index = 0.93087 |
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| Photoelectric: |
PEStrakhovite = 157.97 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Strakhovite is Not Radioactive |
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Strakhovite Classification |
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| Dana Class: |
64.3.2.1 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups | ||
| (64.3)4-membered rings with [Si2O7] dimers | |||
| (64.3.2)Dana Group | |||
| Strunz Class: |
VIII/F.33-20 VIII - Silicates | ||
| VIII/F - Inosilicates (chain and band) Combination of chains and groups | |||
| VIII/F.33 - Davreuxite series | |||
Other Strakhovite Information |
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| References: |
NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(MinRec) | ||
| See Also: |
Links to other databases for Strakhovite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST Search for Strakhovite using: Visit our Advertisers for Strakhovite : Translate Strakhovite Mineral Data : Ask about Strakhovite here : Print or Cut-and-Paste your Strakhovite Specimen Label here :
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