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|Colour:||Dark green-black, ...||Hardness:||3½ - 6½|
|Britholite Group > Apatite Supergroup|
|Name:||From Greek "tria", three, plus "tome", cut, alluding to the trihedral cavities that its acute rhomohedra left imprinted on its accompanying gangue minerals.|
The mineral was described as a new species by Frondel (1961) and named spencite after Hugh S. Spence, a Canadian mineralogist who first found the mineral in 1934. The name was changed to tritomite-(Y) and spencite became a synonym, owing to the implementation of the new nomenclature for rare-earth minerals (Levinson 1966, Nickel & Mandarino 1987). Spencite was the Y-analogue of the tritomite-(Ce), and the tritomite name had priority (Horváth 2003).
Classification of Tritomite-(Y)
|Strunz 8th edition ID:||8/B.33-30|
|Nickel-Strunz 10th (pending) edition ID:||9.AH.25|
9 : SILICATES (Germanates)
A : Nesosilicates
H : Nesosilicates with CO3, SO4, PO4, etc.
|Dana 8th edition ID:||220.127.116.11|
54 : NESOSILICATES Borosilicates and Some Beryllosilicates
2 : Borosilicates and Some Beryllosilicates with B in  coordination
|Hey's CIM Ref.:||17.5.23|
17 : Silicates Containing other Anions
5 : Borosilicates
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Type Occurrence of Tritomite-(Y)
|Type Locality:||Unnamed prospect pit, Cardiff Township, Haliburton Co., Ontario, Canada|
Physical Properties of Tritomite-(Y)
|Colour:||Dark green-black, red-brown, nearly black|
|Hardness (Mohs):||3½ - 6½|
Chemical Properties of Tritomite-(Y)
|Essential elements:||O, Si, Y|
|All elements listed in formula:||Al, B, Ca, F, Fe, H, La, O, Si, Y|
Relationship of Tritomite-(Y) to other Species
|Member of:||Britholite Group > Apatite Supergroup|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Tritomite-(Y)
|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 Tritomite-(Y)
FRONDEL, C. (1961): Two yttrium minerals: spencite and rowlandite. Canadian Mineralogist 6, 576-581. Abstracted in: American Mineralogist (1961): 46: 1204.
JAFFE, H.W. & MOLINSKY, V.J. (1962): Spencite, the yttrium analogue of tritomite from Sussex Co., New Jersey. American Mineralogist 47, 9-25.
JOENSUU, O.I. & INGAMELLS, C.O. (1966): Additional data on the composition of spencite. Canadian Mineralogist 8, 647-649.
LEVINSON, A.A. (1966): A system of nomenclature for rare-earth minerals. American Mineralogist 51, 152-158.
NICKEL, E.H. & MANDARINO, J.A. (1987): Procedures involving the IMA Commission on New Minerals and Mineral Names, and guidelines on mineral nomenclature. Canadian Mineralogist 25, 353-377.
Internet Links for Tritomite-(Y)
Localities for Tritomite-(Y)
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.
(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.