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Törnebohmite-(La)

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Mochalin Log (Motchaline-log), Kyshtym (Kychtym; Kishtim), Chelyabinsk Oblast', Southern Urals, Urals Region, Russia
© Pavel M. Kartashov

Show Törnebohmite-(La) Photos (3)



Formula:
(La,Ce)
 
2
Al(SiO
 
4
)
 
2
(OH)
Colour:Green, olive-greenHardness:4½
Name:Named after Alfred Elis Törnebohm (1838-1911), geologist, a pioneer in the study of the Archean rocks of central Sweden.


Törnebohmite-(Ce)-Törnebohmite-(La) Series.

Classification of Törnebohmite-(La)

IMA status:Approved
Strunz 8th edition ID:8/B.19-30
Nickel-Strunz 10th (pending) edition ID:9.AG.45

9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
Dana 8th edition ID:52.4.5.2

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Hey's CIM Ref.:16.13.3

16 : Silicates Containing Aluminum and other Metals
13 : Aluminosilicates of the rare earths
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Type Occurrence of Törnebohmite-(La)

Type Locality:Mochalin Log (Motchaline-log), Kyshtym (Kychtym; Kishtim), Chelyabinsk Oblast', Southern Urals, Urals Region, Russia

Physical Properties of Törnebohmite-(La)

Lustre:Waxy
Diaphaneity (Transparency):Translucent
Colour:Green, olive-green
Hardness (Mohs):4½

Optical Data of Törnebohmite-(La)

Type:Biaxial (+)
RI values: nα = 1.808 nβ = 1.812 nγ = 1.838
Maximum Birefringence:δ = 0.030

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

Chemical Properties of Törnebohmite-(La)

Formula:
(La,Ce)
 
2
Al(SiO
 
4
)
 
2
(OH)
Essential elements:Al, H, La, O, Si
All elements listed in formula:Al, Ce, H, La, O, Si

Relationship of Törnebohmite-(La) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AG.05Abswurmbachite
CuMn
3+
6
(SiO
 
4
)O
 
8
9.AG.05Braunite
Mn
2+
 
Mn
3+
6
(SiO
 
4
)O
 
8
9.AG.05Neltnerite
CaMn
3+
6
(SiO
 
4
)O
 
8
9.AG.05Braunite-II
CaMn
3+
14
(SiO
 
4
)O
 
20
9.AG.10Långbanite
(Mn
2+
 
,Ca)
 
4
(Mn
3+
 
,Fe
3+
 
)
 
9
Sb
5+
 
(SiO
 
4
)
 
2
O
 
16
9.AG.15Malayaite
CaSn(SiO
 
4
)O
9.AG.15Titanite
CaTi(SiO
 
4
)O
9.AG.15Vanadomalayaite
CaV
4+
 
(SiO
 
4
)O
9.AG.15Natrotitanite
(Na
 
0.5
Y
 
0.5
)Ti(SiO
 
4
)O
9.AG.20Cerite-(Ce)
(Ce,Ca)
 
9
(Mg,Fe)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
9.AG.20Cerite-(La)
(La,Ce,Ca)
 
9
(Fe,Ca,Mg)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
9.AG.20Aluminocerite-(Ce)
(Ce,La,Ca)
 
9
(Al,Fe
3+
 
)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
9.AG.25Trimounsite-(Y)
Y
 
2
Ti
 
2
(SiO
 
4
)O
 
5
9.AG.25Yftisite-(Y)
(Y,Dy,Er)
 
4
(Ti,Sn)(SiO
 
4
)
 
2
O(F,OH)
 
6
9.AG.30Sitinakite
KNa
 
2
Ti
 
4
(SiO
 
4
)
 
2
O
 
5
(OH) · 4H
 
2
O
9.AG.35Kittatinnyite
Ca
 
2
Mn
 
2
Mn(SiO
 
4
)
 
2
(OH)
 
4
 · 9H
 
2
O
9.AG.40aNatisite
Na
 
2
Ti(SiO
 
4
)O
9.AG.40bParanatisite
Na
 
2
Ti(SiO
 
4
)O
9.AG.45Törnebohmite-(Ce)
(Ce,La)
 
2
Al(SiO
 
4
)
 
2
(OH)
9.AG.50Kuliokite-(Y)
Y
 
4
Al(SiO
 
4
)
 
2
(OH)
 
2
F
 
5
9.AG.55Chantalite
CaAl
 
2
(SiO
 
4
)(OH)
 
4
9.AG.60Mozartite
CaMn
3+
 
(SiO
 
4
)(OH)
9.AG.60Vuagnatite
CaAl(SiO
 
4
)(OH)
9.AG.65Hatrurite
Ca
 
3
(SiO
 
4
)O
9.AG.70Jasmundite
Ca
 
11
(SiO
 
4
)
 
4
O
 
2
S
9.AG.75Afwillite
Ca
 
3
(HSiO
 
4
)
 
2
 · 2H
 
2
O
9.AG.80Bultfonteinite
Ca
 
2
(HSiO
 
4
)F · H
 
2
O
9.AG.85Zoltaiite
BaV
4+
2
V
3+
12
(SiO
 
4
)
 
2
O
 
19
9.AG.90Tranquillityite
(Fe
2+
 
,Ca)
 
8
(Zr,Y)
 
2
Ti
 
3
(SiO
 
4
)
 
3
O
 
4
Related Minerals - Hey's Index Grouping:

- +
16.13.1Vyuntspakhkite-(Y)
(Y,Yb)
 
4
Al
 
2.5-1.5
(Si,Al)
 
1.5-2.5
(SiO
 
4
)
 
4
O(OH)
 
7
16.13.2Törnebohmite-(Ce)
(Ce,La)
 
2
Al(SiO
 
4
)
 
2
(OH)
16.13.4Allanite-(Y)
{CaY}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
16.13.5Allanite-(Ce)
{CaCe}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
16.13.6Dollaseite-(Ce)
{CaCe}{MgAlMg}(Si
 
2
O
 
7
)(SiO
 
4
)(OH)F
16.13.8Dissakisite-(Ce)
{CaCe}{Al
 
2
Mg}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)

Other Names for Törnebohmite-(La)

Other Languages:
German:Törnebohmit-(La)
Russian:Торнебомит-(La)

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 Törnebohmite-(La)

Reference List:

- +
Mineralogical Magazine (1921): 19: 351.

American Mineralogist (1982): 67: 1021-1028.

Canadian Mineralogist (1988): 25: 376.

Internet Links for Törnebohmite-(La)

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Törnebohmite-(La) details from Handbook of Mineralogy (PDF)
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    • Localities for Törnebohmite-(La)

    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.
    Australia
     
    • South Australia
      • Olary Province
        • Yunta
    		The Paratoo, iron oxide, copper and REE deposit near Yunta, South Australia. Joel Brugger, Allan Pring and Jason Tilley, South Australian Museum. (Talk prepared and given to the 26th annual conference of the State’s Mineralogical Societies, Australia. June 2003
    Russia
     
    • Urals Region
      • Southern Urals
        • Chelyabinsk Oblast'
          • Kyshtym (Kychtym; Kishtim)
    		N.V. Svyazhin Tornebohmite from alkaline province of Ural, - Zapiski VMO,1962,91,N1, 97-99.
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