Shcherbakovite
A valid IMA mineral species - grandfathered
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About Shcherbakovite
Formula:
(K,Ba)KNa(Ti,Nb)2(Si4O12)O2
Colour:
Dark brown
Lustre:
Vitreous, Greasy
Hardness:
6½
Specific Gravity:
2.968
Crystal System:
Orthorhombic
Member of:
Name:
Named by E.M. Es'kova and M.E. Kazakova in 1954 in honor of Dmitri Ivanovich Shcherbakov (13 January 1893 - 25 May 1966, Moscow, Russia) geochemist and mineralogist.
Batisite Group.
Easily confused with batisite.
Note: the "shcherbakovite" described by Mitchell (1990) is in fact noonkanbahite.
Easily confused with batisite.
Note: the "shcherbakovite" described by Mitchell (1990) is in fact noonkanbahite.
Unique Identifiers
Mindat ID:
3635
Long-form identifier:
mindat:1:1:3635:7
GUID
(UUID V4):
(UUID V4):
3d957aea-3053-406e-a8a5-34e20e170291
IMA Classification of Shcherbakovite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
K2NaTi2O(OH)Si4O12
First published:
1954
Classification of Shcherbakovite
9.DH.20
9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
65.3.4.2
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
3 : Single-Width Unbranched Chains, W=1 with chains P=4
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
3 : Single-Width Unbranched Chains, W=1 with chains P=4
17.8.13
17 : Silicates Containing other Anions
8 : Silicates with niobate or tantalate
17 : Silicates Containing other Anions
8 : Silicates with niobate or tantalate
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 |
---|---|---|
Sbk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Shcherbakovite
Vitreous, Greasy
Transparency:
Opaque
Colour:
Dark brown
Hardness:
6½ on Mohs scale
Hardness:
VHN100=731 - 845 - Vickers
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Two directions, observed microscopically, may be parting.
Two directions, observed microscopically, may be parting.
Fracture:
Irregular/Uneven
Density:
2.968 g/cm3 (Measured) 3.194 g/cm3 (Calculated)
Optical Data of Shcherbakovite
Type:
Biaxial (-)
RI values:
nα = 1.707 nβ = 1.745 nγ = 1.776
2V:
Measured: 82° , Calculated: 82°
Max Birefringence:
δ = 0.069
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:
High
Dispersion:
r > v
Pleochroism:
Visible
Comments:
X = pale yellow; Y = yellow; Z = brownish yellow.
Chemistry of Shcherbakovite
Mindat Formula:
(K,Ba)KNa(Ti,Nb)2(Si4O12)O2
Common Impurities:
Zr,Al,Fe,Ta,Mn,Mg,Ca,Cl,H2O
Crystallography of Shcherbakovite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Imma
Setting:
Imma
Cell Parameters:
a = 10.55 Å, b = 13.92 Å, c = 8.1 Å
Ratio:
a:b:c = 0.758 : 1 : 0.582
Unit Cell V:
1,189.53 ų (Calculated from Unit Cell)
Z:
4
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
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2D | Stereo | Red-Blue | Red-Cyan
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CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
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Labels
Console Off | On | Grey | Yellow
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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) |
---|---|---|---|---|---|---|---|
0005885 | Shcherbakovite | Uvarova Y A, Sokolova E V, Hawthorne F C, Liferovich R P, Mitchell R H (2003) The crystal chemistry of shcherbakovite from the Khibina Massif, Kola Peninsula, Russia The Canadian Mineralogist 41 1193-1201 | 2003 | Khibina Massif, Kola Peninsula, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.90 Å | (100) |
1.081 Å | (100) |
2.64 Å | (70) |
1.688 Å | (70) |
1.576 Å | (60) |
3.39 Å | (50) |
2.04 Å | (50) |
1.538 Å | (50) |
Comments:
Apatitovyi Tsirk, Rasvumchorr Mine, Khibiny Massif, Russia. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 3a: Earth’s earliest Hadean crust | >4.50 |
7 : Ultramafic igneous rocks | |
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Shcherbakovite
General Appearance of Type Material:
Crystals are long prismatic, to 6 cm; terminated crystals are uncommon.
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia; 57256.
Geological Setting of Type Material:
In a pegmatite in alkalic rocks.
Associated Minerals at Type Locality:
Reference:
Es'kova, E.M., Kazakova, M.E. (1954) Shcherbakovite - a new mineral. Doklady Akademii Nauk SSSR: 99: 837-840.
Synonyms of Shcherbakovite
Other Language Names for Shcherbakovite
German:Scherbakovit
Shcherbakovit
Shcherbakovit
Russian:Щербаковит
Simplified Chinese:硅铌钡钠石
Spanish:Scherbakovita
Shcherbakovita
Shcherbakovita
Traditional Chinese:矽鈮鋇鈉石
Relationship of Shcherbakovite to other Species
Member of:
Other Members of this group:
Batisite | BaNaNaTi2(Si4O12)O2 | Orth. mmm (2/m 2/m 2/m) : Imma |
Noonkanbahite | BaKNaTi2(Si4O12)O2 | Orth. mmm (2/m 2/m 2/m) : Imma |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
9.DH. | Gageite-2M | (Mn,Mg,Zn)42Si16O54(OH)40 |
9.DH. | Bavsiite | Ba2V2O2[Si4O12] |
9.DH. | Devilliersite | Ca4Ca2Fe3+10O4[(Fe3+10Si2)O36] |
9.DH. | Yuzuxiangite | Sr3Fe3+(Si2O6)2(OH) · 3H2O |
9.DH. | Louisfuchsite | Ca2(Mg4Ti2)(Al4Si2)O20 |
9.DH.05 | Leucophanite | NaCaBeSi2O6F |
9.DH.10 | Ohmilite | Sr3(Ti,Fe3+)(Si4O12)(O,OH) · 2-3H2O |
9.DH.15 | Haradaite | SrVSi2O7 |
9.DH.15 | Suzukiite | BaVSi2O7 |
9.DH.20 | Batisite | BaNaNaTi2(Si4O12)O2 |
9.DH.20 | Noonkanbahite | BaKNaTi2(Si4O12)O2 |
9.DH.25 | Taikanite | Sr3BaMn2+2(Si4O12)O2 |
9.DH.30 | Krauskopfite | BaSi2O5 · 3H2O |
9.DH.35 | Balangeroite | (Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40 |
9.DH.35 | Gageite | Mn21(Si4O12)2O3(OH)20 |
9.DH.40 | Aenigmatite | Na4[Fe2+10Ti2]O4[Si12O36] |
9.DH.40 | Dorrite | Ca4(Mg3Fe3+9)O4(Si3Al8Fe3+O36) |
9.DH.40 | Høgtuvaite | Ca4[Fe2+6Fe3+6]O4[Si8Be2Al2O36] |
9.DH.40 | Krinovite | Na2Mg4Cr3+2(Si6O18)O2 |
9.DH.40 | Makarochkinite | (Ca,Na)4[Fe2+8Fe3+2Ti2]O4[Si8Be2Al2O36] |
9.DH.40 | Rhönite | Ca4[Mg8Fe3+2Ti2]O4[Si6Al6O36] |
9.DH.40 | Serendibite | Ca4[Mg6Al6]O4[Si6B3Al3O36] |
9.DH.40 | Welshite | Ca4Mg9Sb3O4[Si6Be3AlFe2O36] |
9.DH.40 | Wilkinsonite | Na2Fe2+4Fe3+2(Si6O18)O2 |
9.DH.40 | Leucorhönite | Ca2(Mg,Fe3+,Al)6(Si,Al)6O20 |
9.DH.40 | Kuratite | Ca2(Fe2+5Ti)O2[Si4Al2O18] |
9.DH.40 | Khesinite | Ca4(Mg3Fe3+9)O4(Fe3+9Si3)O36 |
9.DH.40 | UM1991-29-SiO:FeMgNa | Na4(Mg5Fe3+7)O4[Si9Fe3+3O36] |
9.DH.45 | Sapphirine | Mg4(Mg3Al9)O4[Si3Al9O36] |
9.DH.50 | Khmaralite | (Mg,Al,Fe)16[(Al,Si,Be)12O36]O4 |
9.DH.55 | Surinamite | (Mg,Fe)3Al4BeSi3O16 |
9.DH.55 | UM1988-26-SiO:AlMg | Mg4Al2O[Si3Al2O15] |
9.DH.60 | Deerite | (Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5 |
9.DH.65 | Howieite | Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13 |
9.DH.65 | Taneyamalite | (Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44 |
9.DH.70 | Johninnesite | Na2Mn2+9Mg7(OH)8[AsO4]2[Si6O17]2 |
9.DH.75 | Agrellite | NaCa2Si4O10F |
Other Information
Notes:
Insoluble in HNO3 and HCl, partly soluble in H2SO4 on heating.
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 Shcherbakovite
mindat.org URL:
https://www.mindat.org/min-3635.html
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References for Shcherbakovite
Reference List:
Mitchell, Roger H. (1990) Shcherbakovite in leucite phlogopite lamproites from the Leucite Hills, Wyoming. Mineralogical Magazine, 54 (377) 645-646 doi:10.1180/minmag.1990.054.377.18
Localities for Shcherbakovite
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.
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Rasvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia