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Törnebohmite-(La)

Big Photo

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

Series:Forms a series with Törnebohmite-(Ce) (see here)
Related Minerals - Nickel-Strunz Grouping):
9.AG.05Abswurmbachite
CuMn
3+
6
O
 
8
(SiO
 
4
)
9.AG.05Braunite
Mn
2+
 
Mn
3+
6
[O
 
8
|SiO
 
4
]
9.AG.05Neltnerite
CaMn
3+
6
[O
 
8
|SiO
 
4
]
9.AG.10Långbanite
(Mn
2+
 
,Ca)
 
4
(Mn
3+
 
,Fe
3+
 
)
 
9
Sb
5+
 
[O
 
8
|SiO
 
4
]
 
2
9.AG.15Malayaite
CaSn[O|SiO
 
4
]
9.AG.15Titanite
CaTi[O|SiO
 
4
]
9.AG.15Vanadomalayaite
CaV
4+
 
[O|SiO
 
4
]
9.AG.20Cerite-(Ce)
(Ce,Ca)
 
9
(Mg,Fe)Si
 
7
(O,OH,F)
 
28
9.AG.20Cerite-(La)
(La,Ce,Ca)
 
9
(Fe,Ca,Mg)(SiO
 
4
)
 
3
[SiO
 
3
(OH)]
 
4
(OH)
 
3
9.AG.25Trimounsite-(Y)
Y
 
2
Ti
 
2
[O
 
5
|SiO
 
4
]
9.AG.25Yftisite-(Y)
(Y,Dy,Er)
 
4
(Ti,Sn)O(SiO
 
4
)
 
2
(F,OH)
 
6
9.AG.30Sitinakite
KNa
 
2
Ti
 
4
Si
 
2
O
 
13
(OH)·2H
 
2
O
9.AG.35Kittatinnyite
Ca
 
2
Mn
 
2
Mn(SiO
 
4
)
 
2
(OH)
 
4
·9H
 
2
O
9.AG.40Natisite
Na
 
2
Ti[O|SiO
 
4
]
9.AG.40Paranatisite
Na
 
2
Ti[O|SiO
 
4
]
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
[(OH)
 
4
|SiO
 
4
]
9.AG.60Mozartite
CaMn
3+
 
[OH|SiO
 
4
]
9.AG.60Vuagnatite
CaAl[OH|SiO
 
4
]
9.AG.65Hatrurite
Ca
 
3
[O|SiO
 
4
]
9.AG.70Jasmundite
Ca
 
11
[O
 
2
|S|(SiO
 
4
)
 
4
]
9.AG.75Afwillite
Ca
 
3
[HSiO
 
4
]
 
2
 · 2H
 
2
O
9.AG.80Bultfonteinite
Ca
 
2
[F|HSiO
 
4
] · H
 
2
O
9.AG.85Zoltaiite
BaV
4+
2
V
3+
12
Si
 
2
O
 
27
9.AG.90Tranquillityite
(Fe
2+
 
,Ca)
 
8
(Zr,Y)
 
2
Ti
 
3
[O
 
4
|SiO
 
4
]
 
3
Related Minerals - Hey's Index Grouping:
16.13.1Vyuntspakhkite-(Y)
Y
 
4
Al
 
3
Si
 
5
O
 
18
(OH)
 
5
16.13.2Törnebohmite-(Ce)
(Ce,La)
 
2
Al(SiO
 
4
)
 
2
OH
16.13.4Allanite-(Y)
{CaY}{Al
 
2
Fe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
16.13.5Allanite-(Ce)
{CaCe}{Al
 
2
Fe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
16.13.6Dollaseite-(Ce)
{CaCe}{MgAlMg}[F|OH|SiO
 
4
|Si
 
2
O
 
7
]
16.13.8Dissakisite-(Ce)
{CaCe}{Al
 
2
Mg}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]

Other Names for Törnebohmite-(La)

German names:
Törnebohmit-(La)
Russian names:
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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    Localities for Törnebohmite-(La)

    (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
     
    • Urals Region
      • Chelyabinsk Oblast'
        • Kyshtym (Kychtym; Kishtim)
    		N.V. Svyazhin Tornebohmite from alkaline province of Ural, - Zapiski VMO,1962,91,N1, 97-99.
    Mineral and/or Locality
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