Monazite is found worldwide, but large crystals in good form are not common. Large, sharp prismatic
crystals come from several localities at Iveland, Aust-Agder, Norway. Large brown crystals resembling Zircon
have been found in the Ambatofotsikely pegmatite, Fidirana, Antananarivo Province, Madagascar.
A remarkable find of Monazite is at the Siglo Veinte Mine, Llallagua, Potosí, Bolivia, where sherry colored Monazite crystals form in aesthetic formations with Quartz
crystals. Exceptional twinned
crystals, in X-shaped twins, were found in Buenópolis and Diamantina, Minas Gerais, Brazil.
In the U.S., brown rounded Monazite has come from Trout Creek Pass, Chaffee Co., Colorado; and large crystals in loose soil from the Cactus Jack Pegmatite, Burnet Co., Texas. Sharp crystals have come from the Standpipe Hill Area, Topsham, Sagadahoc Co., Maine; and brown tabular
crystals from Portland, Middlesex Co., Connecticut, at the Andrews (Hale), Case, and Strickland Quarries. Stubby crystals are found in the dumps of the Morefield Mine, Amelia Court House, Amelia Co., Virginia.
The above occurrences are primarily Monazite-(Ce), the most prevalent member of this group. Monazite-(La) has come from the Lovozero Massif, Murmanskaya Oblast', Northern Region, Russia; and Monazite-(Nd) from Monte Giove, Ossola Valley area, Piedmont, Italy.