Strakhovite
A valid IMA mineral species
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About Strakhovite
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
GUID
(UUID V4):
(UUID V4):
480689a4-7dd3-4dd5-bc58-5c74afb44513
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 |
---|---|---|
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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
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.
Crystallography of Strakhovite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/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-𝑇 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:
Reference:
Kalinin, V.V., Pushcharovsky, D.Y., Yamnova, N.A., Dikov, Y.P., Borisovsky, S.E. (1994) Strakhovite NaBa3(Mn2+, Mn3+)4Si6O19(OH)3 — a new Na-bearing silicate of Ba and Mn. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva: 123(4): 94-97.
Synonyms of Strakhovite
Other Language Names for Strakhovite
Common Associates
Associated Minerals 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) | Ca2(Y,Ce)2(Si4O12)(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-(Mn) | Ba4Mn3+4(Si4O12)O2(OH)4Cl2[Si2O3(OH)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 |
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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References for Strakhovite
Localities for Strakhovite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
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