Mineral description : Allanite-(Ce)

Allanite from Bastnäs. Allanite as a vein in cerite from Bastnäs.

Mineral class Silicates : Soro silicates : Epidote - Vesuvian group

Chemical formula (Ce,Ca,Y)₂Fe₂Al₂(O/OH/SiO₄/Si₂O₇)

Crystal system Monoclinic

Habitus As long thin prismatic crystals. Also as grainy and massive aggregates.

Cleavage Imperfect along [001] and [100], fracture conchoidal.

Hardness 5.5

Density 3.3-4.2

Color Black to brown. Translucent to opaque.

Streak Grayish brown.

Luster Vitreous, greasy.

Description

Occurance

Associates

Notes Sometimes radioactive.
Easy to ignite.
Soluble in hydrochloric acid.

Locations A number of localities exists in Sweden.

Åskagen quartz quarry, Värmland. As big prisms.
Skillnabo quartz quarry, Västergötland. As big prisms.
Kårarvet and Finnbo quartz quarries, Falun. As radiating bundles.
Ytterby feldspar quarry, Resarö, Stockholm. As radiating crystals.
Slättåkra, Alsheda, Småland. Up to fist sized aggregates in a pegmatite.
Östra Gyttorpsgruvan, Nora. The largest locality in Sweden. Over 20 tons have been mined and aggregates of up to 100 kg have been found.
Bastnäs, Riddarhyttan, Västmanland. As platy individes with cerite.
If anyone knows if the allanite from the above localities are radioactive or not, send me an email so I could include it here. Thanks.

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Last changed : 1998-08-01

Mineral class	Silicates : Soro silicates : Epidote - Vesuvian group
Chemical formula	(Ce,Ca,Y)₂Fe₂Al₂(O/OH/SiO₄/Si₂O₇)
Crystal system	Monoclinic
Habitus	As long thin prismatic crystals. Also as grainy and massive aggregates.
Cleavage	Imperfect along [001] and [100], fracture conchoidal.
Hardness	5.5
Density	3.3-4.2
Color	Black to brown. Translucent to opaque.
Streak	Grayish brown.
Luster	Vitreous, greasy.
Description
Occurance
Associates
Notes	Sometimes radioactive. Easy to ignite. Soluble in hydrochloric acid.
Locations	A number of localities exists in Sweden. Åskagen quartz quarry, Värmland. As big prisms. Skillnabo quartz quarry, Västergötland. As big prisms. Kårarvet and Finnbo quartz quarries, Falun. As radiating bundles. Ytterby feldspar quarry, Resarö, Stockholm. As radiating crystals. Slättåkra, Alsheda, Småland. Up to fist sized aggregates in a pegmatite. Östra Gyttorpsgruvan, Nora. The largest locality in Sweden. Over 20 tons have been mined and aggregates of up to 100 kg have been found. Bastnäs, Riddarhyttan, Västmanland. As platy individes with cerite. If anyone knows if the allanite from the above localities are radioactive or not, send me an email so I could include it here. Thanks.