Formula: (Ce,La,Ca)9(Mg,Fe3+)(SiO4)3(SiO3OH)4(OH)3
Nesosilicate (insular SiO4 groups), cerite group
Specific gravity: 4.86
Hardness: 5½
Streak: Greyish white
Colour: Brown, cherry red, grey
Solubility: Gelatinises with acids

Hydrothermal environments

Minerals associated with cerite-(Ce) include bastnäsite, allanite, epidote, monazite-(Ce), törnebohmite, fluorite, uraninite, baryte, quartz and galena (HOM).


At the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, cerite-(Ce) occurs in a pegmatite (Dana).

At the Lovozero Massif, Murmansk Oblast, Russia, cerite-(Ce) occurs in natrolite veins (Dana).

At the Sangilen Upland, Tuva, Russia, cerite-(Ce) in natrolite veins (Dana).

The type locality is the St Görans Mine, Bastnäs Mines, Riddarhyttan, Skinnskatteberg, Västmanland County, Sweden. At the Bastnäs mines, cerite-(Ce) was found embedded in bismuthinite, together with allanite. Other associated minerals include amphiboles, bastnäsite and törnebohmite. Cerite-(Ce) may be replaced by allanite-(Ce), bastnäsite and more rarely lanthanite-(Ce) (MinRec 35.3.195).

At the Gölcük Maar Crater, Gölcük District, Isparta Province, Turkey, the mineralogical assemblages of skarn samples collected from the volcanoclastic products predominantly consist of clinopyroxene, garnet, vesuvianite, plagioclase, wollastonite, esseneite (or olivine), calcite and dolomite, with accessory ferriallanite-(Ce), phlogopite, amphibole, quartz, apatite, spinel, cerite-(Ce) and monazite-(Ce) (CM 40.1177-1184).

At the Mountain Pass Mine, Mountain Pass, Mountain Pass District, Clark Mts, San Bernardino county, California, USA, cerite-(Ce) occurs in rare-earth-bearing hydrothermal quartz-baryte-carbonatite veins in shonkinite in an area of metamorphic rocks (HOM). Associated minerals include bastnäsite, baryte, quartz, chalcedony, calcite, galena and altered aegirine (AM 43.460-475).

At the Longs Peak - St Vrain batholith near Jamestown, Jamestown District, Boulder county, Colorado, USA, centimetre to decimetre sized mineralised pods and veins consist of zoned mineral assemblages dominated by fluorbritholite-(Ce) in a core 10 cm thick, with monazite-(Ce), fluorite and minor quartz, uraninite and sulphides. The core is surrounded by a typically millimetre thick rim of allanite-(Ce), with minor monazite-(Ce) in the inner part of the rim. Bastnäsite-(Ce), törnebohmite-(Ce) and cerite-(Ce) appear in an intermediate zone between core and rim, often just a few hundreds of microns wide (R&M 96.3.252-253).

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