Formula: CaCe(Al2Fe2+)[Si2O7][SiO4]O(OH)
Sorosilicate (Si2O7 groups), allanite group of the epidote supergroup, cerium-bearing mineral
Specific gravity: 3.4 to 4.2
Hardness: 5 to 6½
Streak: Light brown
Colour: Light brown to black
Solubility: Gelatinises with hydrochloric acid (Dana)

Plutonic igneous environments
Metamorphic environments

Allanite-(Ce) is an accessory mineral in some granites and granite pegmatites and syenites, and more rarely in gabbroic pegmatites; it occurs rarely in schist, gneiss and some contact metamorphosed limestones, and it can be a detrital mineral (Dana, HOM). Associated minerals include epidote, muscovite and fluorite (HOM, Mindat).


At lots 10 and 11 of concession 1, Bathurst Township, Lanark County, Ontario, Canada (DeWitts corner), the deposit is located in the Grenville Geological Province, which consists mostly of marble, gneiss, and quartzite. Syenite-migmatite was also reported in the area where the vein-dikes are located. Characteristic features of the vein-dikes include the fact that perfectly formed euhedral crystals of different minerals can often be found floating in calcite with no points of contact with the walls. Sometimes these crystals have inclusions of calcite, irregular or rounded in shape. It has been argued that at least some of the vein-dikes were formed as a result of melting of Grenville marble.
Allanite-(Ce) is a rare mineral at DeWitts Corners that occurs as brown semitransparent patches to 4 mm on dark green to nearly black diopside crystals (R&M 97.6.556-564).

The type locality is Qáqarssuatsiaq, Aluk Island, Kujalleq, Greenland, Denmark.

At the Trimouns quarry, Ariège, France, allanite-(Ce) is found in dolomite and talc, and may be associated with bastnäsite, synchysite, parisite, quartz, calcite, and very rarely hingganite (R&M 35.3.232, R&M 86.5.451).

At the Bastnas mines, Vastmanland, Sweden, allanite-(Ce) occurs within amphibole skarn and as compact masses with cerite-(CeCa). Associated minerals include chalcopyrite, bismuthinite, bastnäsite and rarely linnaeite (R&M 35.3.193-194).

At Pacoima Canyon, Los Angeles County, California, USA, allanite occurs with zircon and apatite in a pegmatite (AM 56.447).

At the Tiro Estrella mine, Lincoln County, New Mexico, USA, allanite-(Ce) occurs in quartz veins with feldspar.

At the Dafoe Property, Pierrepont, St Lawrence county, New York, USA, allanite-(Ce) occurs as dark brown-to-black, acicular crystals that occur in sprays to 0.5 cm. They are best preserved as inclusions in transparent quartz and calcite. These can usually be seen on the walls of molds of quartz after tourmaline or unidentified species (likely baryte or anhydrite). Allanite-(Ce) more commonly occurs as mats and fillings between, and sometimes on, calcite and quartz. Not all these crystals contain enough cerium to be classified as allanite-(Ce), but rather some are cerium-rich epidote R&M 97.3.247).

At Power's Farm, Pierrepont, St. Lawrence county, New York, USA, allanite-(Ce) occurs as a late-stage mineral associated with microcline, quartz, and chamosite (R&M 85.2.162).

At the danburite occurrence near Russell, St. Lawrence county, New York, USA, allanite-(Ce) forms crystals on tremolite (R&M 90.3.217).

At the Selleck Road Locality, West Pierrepont, St. Lawrence county, New York, USA, allanite-(Ce), or a closely related species, occurs on the surfaces of microcline crystals (R&M 91.2.121).

In New York city, New York, USA, an allanite-(Ce) crystal has been found at the southeast corner of 56th and Broadway embedded in albite pegmatite, and another allanite-(Ce) crystal has been found embedded in quartz from the Brooklyn-Battery Tunnel (R&M 84.3.221-222).

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