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Ternesite

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Big Photo

Lapanouse-de-Sévérac (slag locality), Aveyron, Midi-Pyrénées, France
© JM . Johannet

Show Ternesite Photos (9)



Formula:
Ca
 
5
(SiO
 
4
)
 
2
(SO
 
4
)
System:OrthorhombicColour:pale blue, brown, light ...
Lustre:VitreousHardness:4½ - 5
Name:
For the collector Bernd Ternes of Mayen, Germany, who found the mineral and provided specimens for study. Mr. Ternes is a specialist on the minerals of the Eifel area in Germany.


Isotypic with "silicocarnotite."

Classification of Ternesite

IMA status:Approved 1995
Strunz 8th edition ID:8/B.22-65
Nickel-Strunz 10th (pending) edition ID:9.AH.20

9 : SILICATES (Germanates)
A : Nesosilicates
H : Nesosilicates with CO3, SO4, PO4, etc.
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Type Occurrence of Ternesite

Type Locality:Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany

Physical Properties of Ternesite

Lustre:Vitreous
Colour:pale blue, brown, light green, colourless
Streak:white
Hardness (Mohs):4½ - 5
Cleavage:None Observed

Crystallography of Ternesite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pnma {P21/n 21/m 21/a}
Cell Parameters:a = 6.863Å, b = 15.387Å, c = 10.181Å
Ratio:a:b:c = 0.446 : 1 : 0.662
Unit Cell Volume:V 1,075.12 ų (Calculated from Unit Cell)
Comment:

Optical Data of Ternesite

Type:Biaxial (-)
RI values: nα = 1.630 nβ = 1.637 nγ = 1.640
Maximum Birefringence:δ = 0.010

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

Chemical Properties of Ternesite

Formula:
Ca
 
5
(SiO
 
4
)
 
2
(SO
 
4
)
Essential elements:Ca, O, S, Si
All elements listed in formula:Ca, O, S, Si

Relationship of Ternesite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AH.05Iimoriite-(Y)
Y
 
2
[SiO
 
4
][CO
 
3
]
9.AH.10Tundrite-(Ce)
Na
 
2
Ce
 
2
Ti(SiO
 
4
)(CO
 
3
)
 
2
O
 
2
9.AH.10Tundrite-(Nd)
Na
 
3
(Nd,La)
 
4
(Ti,Nb)
 
2
(SiO
 
4
)
 
2
(CO
 
3
)
 
3
O
 
4
(OH) · 2H
 
2
O
9.AH.15Spurrite
Ca
 
5
(SiO
 
4
)
 
2
(CO
 
3
)
9.AH.25Britholite-(Ce)
Ca
 
2
(Ce,Ca)
 
3
(SiO
 
4
,PO
 
4
)
 
3
(OH,F)
9.AH.25Britholite-(Y)
Ca
 
2
(Y,Ca)
 
3
(SiO
 
4
,PO
 
4
)
 
3
(OH,F)
9.AH.25Ellestadite-(Cl)
Ca
 
10
(SiO
 
4
)
 
3
(SO
 
4
)
 
3
Cl
 
2
9.AH.25Fluorbritholite-(Ce)
Ca
 
2
(Ce,Ca)
 
3
(SiO
 
4
,PO
 
4
)
 
3
(F,OH)
9.AH.25Fluorellestadite
Ca
 
5
(SiO
 
4
)
 
1.5
(SO
 
4
)
 
1.5
F
9.AH.25Hydroxylellestadite
Ca
 
5
(SiO
 
4
)
 
1.5
(SO
 
4
)
 
1.5
(OH)
9.AH.25Mattheddleite
Pb
 
5
(SiO
 
4
)
 
1.5
(SO
 
4
)
 
1.5
(Cl,OH)
9.AH.25Tritomite-(Ce)
(Ce,La,Y,Th)
 
5
(Si,B)
 
3
(O,OH,F)
 
13
9.AH.25Tritomite-(Y)
(Y,Ca,La,Fe)
 
5
(Si,B,Al)
 
3
(O,OH,F)
 
13
9.AH.25Fluorcalciobritholite
(Ca,Ce)
 
5
 (SiO
 
4
,PO
 
4
)
 
3
F
9.AH.25Fluorbritholite-(Y)
Ca
 
2
(Y,Ca,Ln)
 
3
(SiO
 
4
,PO
 
4
)
 
3
(F,OH)

Other Names for Ternesite

Synonyms:
IMA1995-015
Other Languages:
German:Ternesit
Russian:Тернесит
Spanish:Ternesita

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 Ternesite

Reference List:

- +
Irran, E. (1995): Ternesit, Ca5(SiO4)2SO4, ein neues Mineral vom Bellerberg. Diplomarbeit, Universität Wien, Formal- und Naturwissenschaftliche Fakultät, xx pp.

Irran, E., Tillmanns, E. and Hentschel, G. (1997): Ternesite, Ca5(SiO4)2SO4, a new mineral from the Ettringer Bellerberg/Eifel, Germany. Mineralogy and Petrology 60, 121-132.

Internet Links for Ternesite

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    • Localities for Ternesite

    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.
    France
     
    • Midi-Pyrénées
      • Aveyron
    		Eytier J.R. & Ch., Favreau G., Devouard B., Vigier J. (2004), Minéraux de pyrométamorphisme de Lapanouse-de Sévérac (Aveyron), Cahier des Micromonteurs, n°85, pp: 3-58
    Germany
     
    • Rhineland-Palatinate
      • Eifel
        • Mayen
          • Ettringen
            • Bellerberg volcano
    		Mineralogy and Petrolology 60 (1997), 121; MR 5 (1998), 477; AM 83 (1998), 187
    Irran, E.; Tillmanns, E. and Hentschel, G., (1997): Ternesite, Ca5(SiO4)2SO4, a new mineral from the Ettringer Bellerberg/Eifel, Germany Mineralogy and Petrology: 60, 121-132.
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