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A reddish-brown phosphate mineral containing several rare-earth elements, (Ce, La, Nd, Y, Th)PO4, important as a source of cerium and thorium.

[Greek monazein, to live alone; see monastery + -ite.]


(Minerals) a yellow to reddish-brown mineral consisting of a phosphate of thorium, cerium, and lanthanum in monoclinic crystalline form
[C19: from German, from Greek monazein to live alone, so called because of its rarity]


(ˈmɒn əˌzaɪt)

a reddish brown mineral, a phosphate of cerium, lanthanum, and thorium, (Ce, La, Th)PO4: the principal ore of thorium.
[< German Monazit (1829)]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.monazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium
atomic number 58, Ce, cerium - a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group
atomic number 63, Eu, europium - a bivalent and trivalent metallic element of the rare earth group
atomic number 60, Nd, neodymium - a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium
atomic number 59, Pr, praseodymium - a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process
atomic number 62, samarium, Sm - a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite
atomic number 65, Tb, terbium - a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite
atomic number 90, thorium, Th - a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
atomic number 69, thulium, Tm - a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime
atomic number 70, Yb, ytterbium - a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
References in periodicals archive ?
On the south shore are extensive black-sand deposits with ilmenite, zircon, and monazite, with lesser amounts of other heavy minerals.
Police discovered two boxes containing some 40 kilograms of monazite, a radioactive material, in a man's home in Hanyu, Saitama Prefecture, in the course of investigations into the mailing of the substance to 10 government offices earlier this month, police said.
These reserves are estimated at 60 Mt, containing 60% ilmenite, 3% zirconium, 3% rutile and 1% monazite, and possible production is put at 750,000 t/y from sites near Toalagnaro, Petriky and Mandena.
Tenders are invited for Expression of interest for technical audit of Monazite Processing Plant at Oscom unit Odisha Annexure A and Mining and Mineral Separation Division of Oscom unit Odisha Annexure B and High Pure Rare Earth Plant at Rare Earths Division Udyogamandal Kerala Annexure C
Thermobarometry and in-situ U-Th-Pb monazite geochronology of metamorphic rocks from the dome, the Leo Pargil shear zone, and the immediate hanging wall were combined with U-Th-Pb monazite geochronology of the leucogranite injection complex within the dome to evaluate the relationship between metamorphism, crustal melting, and the onset of exhumation.
Preliminary U-Th-Pb geochronologic analyses indicate monazite growth in the Greater Himalayan sequence during the early and middle Miocene in kyanite and sillimanite grade rocks, and during the late Miocene in staurolite grade rocks.
It is the type locality for five mineral species (vauxite, metavauxite, paravauxite, sigloite and jeanbandyite) and has also produced some of the world's best specimens of stannite, cylindrite, monazite, bismoclite, and other species.
In both rock types, biotite contains inclusions of apatite, zircon, monazite, and titanite.
Heavy minerals like ilmenite, rutile, zircon, monazite, bentonite, diatomite, and coal are found in the younger sediments.