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Shcherbakovite

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Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© Element51.com

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Formula:
Na(K,Ba)
 
2
(Ti,Nb)
 
2
[O|Si
 
2
O
 
6
]
 
2
System:OrthorhombicColour:Dark brown
Hardness:6½
Name:Named after Dmitri Ivanovich Shcherbakov (1893-1966) geochemist and mineralogist.
This page provides mineralogical data about Shcherbakovite.

Classification of Shcherbakovite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/F.25-20
Nickel-Strunz 10th (pending) edition ID:9.DH.20

9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
Dana 8th edition ID:65.3.4.2

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
3 : Single-Width Unbranched Chains, W=1 with chains P=4
Hey's CIM Ref.:17.8.13

17 : Silicates Containing other Anions
8 : Silicates with niobate or tantalate
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Type Occurrence of Shcherbakovite

Type Locality:Apatitovyi Tsirk (Apatite Circus), Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Year of Discovery:1954

Physical Properties of Shcherbakovite

Lustre:Vitreous, Greasy
Diaphaneity (Transparency):Opaque
Colour:Dark brown
Hardness (Mohs):6½

Crystallography of Shcherbakovite

Crystal System:Orthorhombic
Cell Parameters:a = 10.55Å, b = 13.92Å, c = 8.1Å
Ratio:a:b:c = 0.758 : 1 : 0.582
Unit Cell Volume:V 1,189.53 ų (Calculated from Unit Cell)

Optical Data of Shcherbakovite

Type:Biaxial (-)
RI values: nα = 1.707 nβ = 1.745 nγ = 1.776
2V:Measured: 82° , Calculated: 82°
Maximum Birefringence:δ = 0.069

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r > v

Chemical Properties of Shcherbakovite

Formula:
Na(K,Ba)
 
2
(Ti,Nb)
 
2
[O|Si
 
2
O
 
6
]
 
2
Essential elements:K, Na, O, Si, Ti
All elements listed in formula:Ba, K, Na, Nb, O, Si, Ti
Common Impurities:Zr,Al,Fe,Ta,Mn,Mg,Ca,Cl,H2O

Relationship of Shcherbakovite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.DH.05Leucophanite
(Ca,Na)
 
2
(Be,Al)[Si
 
2
O
 
6
(F,OH)]
9.DH.10Ohmilite
Sr
 
3
(Ti,Fe
3+
 
)[(O,OH)|(Si
 
2
O
 
6
)
 
2
] · 2-3H
 
2
O
9.DH.15Haradaite
SrVSi
 
2
O
 
7
9.DH.15Suzukiite
BaVSi
 
2
O
 
7
9.DH.20Batisite
Na
 
2
BaTi
 
2
[O|Si
 
2
O
 
6
]
 
2
9.DH.25Taikanite
Sr
 
3
BaMn
2+
2
[O|Si
 
2
O
 
6
]
 
2
9.DH.30Krauskopfite
BaSi
 
2
O
 
5
·3H
 
2
O
9.DH.35Balangeroite
(Mg,Fe,Fe,Mn)
 
42
Si
 
16
O
 
54
(OH)
 
40
9.DH.35Gageite
Mn
 
21
O
 
3
(Si
 
4
O
 
12
)
 
2
(OH)
 
20
9.DH.40Aenigmatite
Na
 
2
Fe
2+
5
TiO
 
2
]Si
 
6
O
 
18
]
9.DH.40Dorrite
Ca
 
2
(Mg,Fe
2+
 
)
 
2
Fe
3+
4
[O
 
2
|Al
 
4
Si
 
2
O
 
18
]
9.DH.40Høgtuvaite
(Ca,Na)
 
2
(Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|Be(Si,Al)
 
5
O
 
18
]
9.DH.40Krinovite
Na
 
2
Mg
 
4
Cr
3+
2
[O
 
2
|Si
 
6
O
 
18
]
9.DH.40Makarochkinite
Ca
 
2
Fe
2+
4
Fe
3+
 
Ti[O
 
2
|BeAlSi
 
4
O
 
18
]
9.DH.40Rhönite
Ca
 
2
(Mg,Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|(Si,Al)
 
6
O
 
18
]
9.DH.40Serendibite
(Ca,Na)
 
2
(Mg,Fe
2+
 
)
 
3
(Al,Fe
3+
 
)
 
3
[O
 
2
|(Si,Al,B)
 
6
O
 
18
]
9.DH.40Welshite
Ca
 
4
Mg
 
9
Sb
 
3
O
 
4
[Si
 
6
Be
 
3
AlFe
 
2
O
 
36
]
9.DH.40Wilkinsonite
Na
 
2
Fe
2+
4
Fe
3+
2
[O
 
2
|Si
 
6
O
 
18
]
9.DH.45Sapphirine
(Mg,Fe)
 
4-x
Al
 
4+x
[Al
 
4+x
Si
 
2-x
O
 
18
]O
 
2
9.DH.50Khmaralite
(Mg,Al,Fe)
 
16
[(Al,Si,Be)
 
12
O
 
36
]O
 
4
9.DH.55Surinamite
(Mg,Fe)
 
3
Al
 
4
BeSi
 
3
O
 
16
9.DH.60Deerite
(Fe,Mn)
 
6
(Fe,Al)
 
3
Si
 
6
O
 
20
(OH)
 
5
9.DH.65Howieite
Na(Fe,Mn)
 
10
(Fe,Al)
 
2
Si
 
12
O
 
31
(OH)
 
13
9.DH.65Taneyamalite
(Na,Ca)(Mn,Mg,Fe)
 
12
Si
 
12
(O,OH)
 
44
9.DH.70Johninnesite
Na
 
2
Mg
 
5
Mn
 
12
As
 
2
Si
 
12
O
 
43
(OH)
 
6
9.DH.75Agrellite
NaCa
 
2
[F|Si
 
4
O
 
10
]
Related Minerals - Hey's Index Grouping:
17.8.1Epistolite
Na
 
2
(Nb,Ti)
 
2
[O
 
2
|Si
 
2
O
 
7
] · nH
 
2
O
17.8.2Murmanite
Na
 
2
(Ti,Nb)
 
2
Si
 
2
O
 
9
·nH
 
2
O
17.8.3Perraultite
(Na,Ca)(Ba,K)(Mn,Fe)
 
4
(Ti,Nb)
 
2
Si
 
4
O
 
16
(OH,F,O)
 
3
17.8.4Niocalite
(Ca,Nb)
 
4
[(O,OH,F)
 
2
|Si
 
2
O
 
7
]
17.8.5Mongolite
Ca
 
4
Nb
 
6
Si
 
5
O
 
24
(OH)
 
10
·nH
 
2
O
17.8.6Fersmanite
(Ca,Na)
 
4
(Ti,Nb)
 
2
Si
 
2
O
 
11
(F,OH)
 
2
17.8.7Nacareniobsite-(Ce)
Na
 
3
Ca
 
3
(Ce,La,Nd)Nb[F
 
3
|O|(Si
 
2
O
 
7
)
 
2
]
17.8.8Nenadkevichite
(Na,Ca)(Nb,Ti)Si
 
2
O
 
7
·2H
 
2
O
17.8.9Natrokomarovite
(Na,Ca,H)
 
2
Nb
 
2
Si
 
2
O
 
10
(OH,F)
 
2
·H
 
2
O
17.8.10Wöhlerite
NaCa
 
2
(Zr,Nb)[(O,OH,F)
 
2
|Si
 
2
O
 
7
]
17.8.11Belkovite
Ba
 
3
(Nb,Ti)
 
6
[O
 
6
|Si
 
2
O
 
7
]
 
2
17.8.12Baotite
Ba
 
4
(Ti,Nb)
 
8
Si
 
4
O
 
28
Cl
17.8.14Ilímaussite-(Ce)
(Na,K)
 
7-8
(Ba,K)
 
10
Ce
 
5
(Nb,Ti)
 
6
[O
 
6
|Si
 
9
O
 
18
(O,OH)
 
24
|(Si
 
6
O
 
18
)
 
2
]
17.8.15Komarovite
(Ca,Mn)Nb
 
2
[O
 
3
|Si
 
2
O
 
7
] · 3.5H
 
2
O
17.8.16Manganbelyankinite
(Mn,Ca)(Ti,Nb)
 
5
O
 
12
·9H
 
2
O
17.8.17Niobophyllite
(K,Na)
 
3
(Fe,Mn)
 
6
(Nb,Ti)
 
2
Si
 
8
(O,OH,F)
 
31
17.8.18Caesium-Kupletskite

Other Names for Shcherbakovite

Synonyms:
Scherbakovite
German names:
ScherbakovitShcherbakovit
Russian names:
Щербаковит
Spanish names:
ScherbakovitaShcherbakovita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Shcherbakovite

Reference List:American Mineralogist (1955): 40: 788.

Doklady Akademii Nauk SSSR: 99: 837-840.

Canadian Mineralogist (2003): 41: 1193-1201.

Internet Links for Shcherbakovite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Shcherbakovite in the Natural History Museum (London) online catalogue
  • Shcherbakovite details from Handbook of Mineralogy (PDF)
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    Localities for Shcherbakovite

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    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
    		[World of Stones 12:49]
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
            • Eveslogchorr Mt
    		Men'shikov Yu.P., Khomyakov A.P., Ferraris G. e.a. (2003) Eveslogite, (Ca,K,Na,Sr,Ba)48[(Ti,Nb,Mn,Fe")12(OH)12Si48O144](F,OH,Cl)14, a new mineral from the Khibiny alkaline massif, Kola peninsula, Russia, - Zapiski VMO, 132(1), pp. 59-67 (in Rus.).
    [World of Stones 95:5-6, p64]
    [Mandarino, 1997]
    Am Min 79:1011
    [World of Stones 95:5-6, p64]
            • Vuonnemiok River Valley
            • Yukspor Mt
          • Lovozero Massif
    USA
     
    • Wyoming
      • Sweetwater Co.
    		Rocks & Minerals 76:390
    Mineral and/or Locality
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