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Trimounsite-(Y)

Formula:
Y
 
2
Ti
 
2
[O
 
5
|SiO
 
4
]
System:MonoclinicColour:Light brown
Hardness:7
Name:Named after its discovery locality, Trimouns talc deposit, near Luzenac, Ariege, France.
This page provides mineralogical data about Trimounsite-(Y).

Classification of Trimounsite-(Y)

IMA status:Approved 1989
Strunz 8th edition ID:8/B.12-30
Nickel-Strunz 10th (pending) edition ID:9.AG.25

9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
Dana 8th edition ID:52.4.8.1

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.:14.9.21

14 : Silicates not Containing Aluminum
9 : Silicates of Ti
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Type Occurrence of Trimounsite-(Y)

Type Locality:Trimouns Talc Mine, Luzenac, Ariège, Midi-Pyrénées, France

Physical Properties of Trimounsite-(Y)

Lustre:Adamantine
Diaphaneity (Transparency):Transparent, Translucent
Colour:Light brown
Hardness (Mohs):7

Crystallography of Trimounsite-(Y)

Crystal System:Monoclinic

Optical Data of Trimounsite-(Y)

Type:Biaxial (-)
RI values: nα = 2.100
Maximum Birefringence:δ = 2.100

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

Chemical Properties of Trimounsite-(Y)

Formula:
Y
 
2
Ti
 
2
[O
 
5
|SiO
 
4
]
Essential elements:O, Si, Ti, Y
All elements listed in formula:O, Si, Ti, Y

Relationship of Trimounsite-(Y) to other Species

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.05Braunite-II
CaMn
3+
14
SiO
 
24
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.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.40aNatisite
Na
 
2
Ti[O|SiO
 
4
]
9.AG.40bParanatisite
Na
 
2
Ti[O|SiO
 
4
]
9.AG.45Törnebohmite-(Ce)
(Ce,La)
 
2
Al(SiO
 
4
)
 
2
OH
9.AG.45Törnebohmite-(La)
(La,Ce)
 
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:

- +
14.9.1Natisite
Na
 
2
Ti[O|SiO
 
4
]
14.9.2Lorenzenite
Na
 
2
Ti
 
2
[O
 
3
|Si
 
2
O
 
6
]
14.9.3Lintisite
LiNa
 
3
Ti
 
2
[O|Si
 
2
O
 
6
]
 
2
 · 2H
 
2
O
14.9.4Davanite
K
 
2
TiSi
 
6
O
 
15
14.9.5Kazakovite
Na
 
6
Ti[Si
 
6
O
 
16
(OH)
 
2
]
14.9.6Titanite
CaTi[O|SiO
 
4
]
14.9.7Ohmilite
Sr
 
3
(Ti,Fe
3+
 
)[(O,OH)|(Si
 
2
O
 
6
)
 
2
] · 2-3H
 
2
O
14.9.8Lamprophyllite
(Sr,K,Ba)
 
2
(Na,Ti,Mn
2+
 
,Fe
3+
 
)
 
4
Ti
 
2
[O|(O,OH,F)|Si
 
2
O
 
7
]
 
2
14.9.9Benitoite
BaTi[Si
 
3
O
 
9
]
14.9.10Batisite
Na
 
2
BaTi
 
2
[O|Si
 
2
O
 
6
]
 
2
14.9.11Fresnoite
Ba
 
2
Ti[O|Si
 
2
O
 
7
]
14.9.12Joaquinite-(Ce)
Ba
 
2
NaCe
 
2
FeTi
 
2
Si
 
8
O
 
26
(OH,F) · H
 
2
O
14.9.13Orthojoaquinite-(Ce)
Ba
 
2
NaCe
 
2
FeTi
 
2
Si
 
8
O
 
26
(O,OH) · H
 
2
O
14.9.14Strontiojoaquinite
Sr
 
2
Ba
 
2
(Na,Fe)
 
2
Ti
 
2
Si
 
8
O
 
24
(O,OH)
 
2
·H
 
2
O
14.9.15Bario-orthojoaquinite
(Ba,Sr)
 
4
Fe
 
2
Ti
 
2
Si
 
8
O
 
26
·H
 
2
O
14.9.16Strontio-orthojoaquinite
Sr
 
2
Ba
 
2
(Na,Fe)
 
2
Ti
 
2
Si
 
8
O
 
24
(O,OH)
 
2
·H
 
2
O
14.9.17Bafertisite
Ba(Fe
3+
 
,Mn
2+
 
)
 
2
Ti[O|(O,OH)
 
2
|Si
 
2
O
 
7
]
14.9.18Hejtmanite
Ba(Mn
2+
 
,Fe
2+
 
)
 
2
Ti[O|(OH,F)
 
2
|Si
 
2
O
 
7
]
14.9.19Delindeite
(Na,K)
 
2.7
(Ba,Ca)
 
4
(Ti,Fe,Al)
 
6
Si
 
8
O
 
26
(OH)
 
14
14.9.20Barytolamprophyllite
(Ba,Na)
 
2
(Na,Ti,Fe
3+
 
)
 
4
Ti
 
2
[O|(OH,F)|Si
 
2
O
 
7
]
 
2
14.9.22Perrierite-(Ce)
(Ce,Ca,Th)
 
4
(Mg,Fe
2+
 
)
 
2
(Ti,Fe
3+
 
)
 
3
[O
 
4
|Si
 
2
O
 
7
]
 
2
14.9.23Chevkinite
(Ca,Ce,Th)
 
4
(Fe,Mn)
 
2
(Ti,Fe)
 
3
Si
 
4
O
 
22
14.9.24Strontiochevkinite
(Sr,La,Ce,Ca)
 
4
Fe
3+
 
(Ti,Zr)
 
2
Ti
 
2
[O
 
4
|Si
 
2
O
 
7
]
 
2
14.9.25Tisinalite
Na
 
3
H
 
3
(Mn,Ca,Fe)TiSi
 
6
(O,OH)
 
18
·2H
 
2
O
14.9.26Neptunite
Na
 
2
KLi(Fe
2+
 
,Mn
2+
 
)
 
2
Ti
 
2
[Si
 
8
O
 
24
]
14.9.27Manganoneptunite
Na
 
2
KLi(Mn
2+
 
,Fe
2+
 
)
 
2
Ti
 
2
[Si
 
8
O
 
24
]
14.9.28Kupletskite
(K,Na)
 
3
(Mn,Fe)
 
7
Ti
 
2
Si
 
8
O
 
26
(OH)
 
4
F
14.9.29Astrophyllite
(K,Na)
 
3
(Fe,Mn)
 
7
Ti
 
2
Si
 
8
O
 
24
(O,OH)
 
7
14.9.30Hydroastrophyllite
(H
 
3
O,K,Ca)
 
3
(Fe,Mn)
 
5-65
Ti
 
2
Si
 
8
(O,OH)
 
31
14.9.31Magnesioastrophyllite
(Na,K)
 
4
Mg
 
2
(Fe,Fe,Mn)
 
5
Ti
 
2
Si
 
8
O
 
24
(O,OH,F)
 
7
14.9.32Baratovite
KCa
 
7
(Ti,Zr)
 
2
Li
 
3
Si
 
12
O
 
36
F
 
2
14.9.34Aenigmatite
Na
 
2
Fe
2+
5
TiO
 
2
]Si
 
6
O
 
18
]
14.9.35Schorlomite
Ca
 
3
(Ti,Fe
3+
 
)
 
2
[(Si,Fe
3+
 
,Fe
2+
 
)O
 
4
]
 
3
14.9.36Tinaksite
K
 
2
Na(Ca,Mn
2+
 
)
 
2
Ti[O|Si
 
7
O
 
18
(OH)]
14.9.37Janhaugite
(Na,Ca)
 
3
(Mn,Fe)
 
3
(Ti,Zr,Nb)
 
2
Si
 
4
O
 
15
(OH,F,O)
 
3
14.9.38Koashvite
Na
 
6
(Ca,Mn)(Ti,Fe)Si
 
6
O
 
18
·H
 
2
O

Other Names for Trimounsite-(Y)

Synonyms:
IMA1989-042
Other Languages:
German:Trimounsit-(Y)
Russian:Тримунсит-(Y)

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 Trimounsite-(Y)

Reference List:Piret, P., Deliens, M. & Pinet, M. (1990): La trimounsite-(Y), nouveau silicotitanate de terres rares de Trimouns, Ariège, France: (TR)2Ti2SiO9. European Journal of Mineralogy: 2: 725-729. (in French).

U. Kolitsch (2001): The crystal structure of trimounsite-(Y), (Y,REE)2Ti2SiO9. Eur. J. Mineral. 13, 761-768.

New Minerals (1997), New Minerals 1990-1994.

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    Localities for Trimounsite-(Y)

    (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
      • Ariège
        • Luzenac
    		Piret, P., Deliens, M., Pinet, M. (1990): La trimounsite-(Y), nouveau silicotitanate de terres rares de Trimouns, Ariège, France: (TR)2Ti2SiO9. Eur. J. Mineral., 2, 725-729; Le Cahier des Micromonteurs 1990, 4, p.3,8-12]
    Mineral and/or Locality
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