Strakhovite
A valid IMA mineral species
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About Strakhovite
Nikolai M. Strakhov
Formula:
NaBa3Mn2+2Mn3+2Si6O19(OH)3
authors gave the formula NaBa3Mn2+2Mn3+2[Si4O10(OH)2][Si2O7]O2(F,OH)·H2O More recent investigation shows absence of fluorine in the mineral.
Colour:
Black, greenish tint
Lustre:
Vitreous, Greasy
Hardness:
5 - 6
Specific Gravity:
3.86
Crystal System:
Orthorhombic
Name:
Named after Nikolai Mikhailovich Strakhov (Николай Михайлович Страхов) (2 (15) April 1900 Bolkhov, Bolkhov district, Orel province, Russian Empire - 13 July 1978, Moscow, USSR), petrologist, geologist and geochemist. He is considered one of the founders of modern lithology.
This page provides mineralogical data about Strakhovite.
Unique Identifiers
Mindat ID:
3797
Long-form identifier:
mindat:1:1:3797:2
IMA Classification of Strakhovite
Approved
IMA Formula:
NaBa3(Mn2+,Mn3+)4[Si4O10(OH)2][Si2O7]O2·(F,OH)·H2O
Approval year:
1993
First published:
1994
Classification of Strakhovite
9.CF.20
9 : SILICATES (Germanates)
C : Cyclosilicates
F : [Si4O12]8- 4-membered single rings, with insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
F : [Si4O12]8- 4-membered single rings, with insular complex anions
64.3.2.1
64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
3 : Rings with Other Anions and Insular Silicate Groups: 4-membered rings with [Si2O7] dimers
64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
3 : Rings with Other Anions and Insular Silicate Groups: 4-membered rings with [Si2O7] dimers
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Skhv | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Strakhovite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Strakhovite
Vitreous, Greasy
Transparency:
Translucent
Colour:
Black, greenish tint
Streak:
Olive green
Hardness:
5 - 6 on Mohs scale
Hardness:
VHN100=633 - 764 kg/mm2 - Vickers
Cleavage:
Imperfect/Fair
Imperfect {110}
Imperfect {110}
Density:
3.86 g/cm3 (Measured) 3.84 g/cm3 (Calculated)
Optical Data of Strakhovite
Type:
Biaxial (+)
RI values:
nα = 1.767(6) nβ = 1.793 nγ = 1.871(6)
2V:
Measured: 60° to 65°, Calculated: 64°
Max. Birefringence:
δ = 0.104
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
strong
Pleochroism:
Strong
Comments:
X = light green, Y = green, Z = dark olive green to brown
Chemistry of Strakhovite
Mindat Formula:
NaBa3Mn2+2Mn3+2Si6O19(OH)3
authors gave the formula NaBa3Mn2+2Mn3+2[Si4O10(OH)2][Si2O7]O2(F,OH)·H2O More recent investigation shows absence of fluorine in the mineral.
authors gave the formula NaBa3Mn2+2Mn3+2[Si4O10(OH)2][Si2O7]O2(F,OH)·H2O More recent investigation shows absence of fluorine in the mineral.
Element Weights:
Crystallography of Strakhovite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 23.42(1) Å, b = 12.266(8) Å, c = 7.181(5) Å
Ratio:
a:b:c = 1.909 : 1 : 0.585
Unit Cell V:
2,062.88 ų (Calculated from Unit Cell)
Z:
4
Comment:
pace group Pnma
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014192 | Strakhovite | Yamnova N A, Puscharovskii D Y, Mernaf T, Kalinin V V, Kalacheva L V (1992) Crystal structure of a new natural Na, Ba, Mn-fluorosilicate Kristallografiya 37 345-351 | 1992 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.580 Å | (50) |
| 3.303 Å | (90) |
| 2.999 Å | (100) |
| 2.715 Å | (50) |
| 2.655 Å | (100) |
| 1.648 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Strakhovite
Co-Type Localities:
General Appearance of Type Material:
grains to 0.7 mm across;
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Moscow, Russia.
Associated Minerals at Type Locality:
Synonyms of Strakhovite
Other Language Names for Strakhovite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 9.CF. | Bobmeyerite | Pb4(Al3Cu)(Si4O12)(S0.5Si0.5O4)(OH)7Cl(H2O)3 |
| 9.CF.05 | Ashburtonite | Pb4Cu4(Si4O12)(HCO3)4(OH)3Cl · H2O |
| 9.CF.10 | Kainosite-(Y) | Ca2Y2(SiO3)4(CO3) · H2O |
| 9.CF.15 | Clinophosinaite | Na12(Ca,Sr)4(Si4O12)(PO4)4 |
| 9.CF.15 | Phosinaite-(Ce) | Na13Ca2(Ce,La,Th,Nd,Pr)(Si4O12)(PO4)4 |
| 9.CF.25 | Cerchiaraite-(Al) | Ba4Al4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl |
| 9.CF.25 | Cerchiaraite-(Fe) | Ba4Fe3+4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl |
| 9.CF.25 | Cerchiaraite-(Mn) | Ba4Mn3+4(Si4O12)O2(OH)4Cl2[Si2O3(OH)4] |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Strakhovite
mindat.org URL:
https://www.mindat.org/min-3797.html
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Please feel free to link to this page.
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References for Strakhovite
Localities for Strakhovite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Japan | |
| Nishio-Hamane et al. (2012) |
Russia | |
| Mandarino (1996) |
| Pekov (1998) |
| Pekov (1998) |
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Dzhavodi area, Ir-Nimi manganese deposit, Taikan Ridge, Khabarovsk Krai, Russia