Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits. India, Madagascar, and South Africa have large deposits of monazite sands. The deposits in India are particularly rich in monazite.
Is monazite an igneous rock?
The mineral monazite, a uranium- and thorium-rich phosphate of a rare-earth element (REE), is a common accessory mineral in a variety of felsic igneous rocks and is a common trace constituent in many metamorphic rocks, particularly metapelites.
What is monazite used in?
Monazite is a primary ore of several rare earth metals most notably thorium, cerium and lanthanum. All these metals have various industrial uses and are considered quite valuable. Thorium is a highly radioactive metal and could be used as a replacement for uranium in nuclear power generation.
Is monazite a metamorphic rock?
Metamorphism. … Monazite is commonly found in many metamorphic rocks, especially in those formed from pelites and sandstones. The zonation in monazite reflects the successive monazite forming events.
What type of rock is monazite found in?
What is Monazite? Monazite is a rare phosphate mineral with a chemical composition of (Ce,La,Nd,Th)(PO4,SiO4). It usually occurs in small isolated grains, as an accessory mineral in igneous and metamorphic rocks such as granite, pegmatite, schist, and gneiss.
Is monazite radioactive?
Monazite is a naturally occurring radioactive material that is processed for use in a variety of domestic applications. At present, there is little information available on potential radiation doses experienced by people working with monazite.
In which state monazite sand is found?
Monazite sands occur on east and west coasts and in some places in Bihar. But the largest concentration of monazite sand is on the Kerala coast. Over 15,200 tonnes of uranium is estimated to be contained in monazite. Some uranium is found in the copper mines of Udaipur in Rajasthan.
How are lanthanides extracted from monazite sand?
The anhydrous fluorides and chlorides are heated under an atmosphere of argon in presence of calcium at 1270K to get individual lanthanum metal. The pure metals are obtained by heating the trifluorides of lanthanides in the presence of calcium and lithium.
Which element is rich in the monazite sands of Kerala?
so the correct answer is C. Due to the alpha decay of thorium and uranium, monazite contains a significant amount of helium, which can be extracted by heating. Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits.
Is monzonite a rock?
Monzonite is an intermediate igneous intrusive rock composed of approximately equal amounts of K–feldspars and Na–plagioclase with minor amount of quartz (<5%) and ferromagnesian minerals (hornblende, biotite and pyroxene).
How can sedimentary rocks become igneous rocks?
Explanation: When Sedimentary rocks are heated with tremendous heat and pressure, it will melt and be back again to magma. After some time it will cool and harden and will become Igneous rocks.
How do you get monazite?
Monazite is a rare Mineral Commodity that can be mined from Hotspots in metal rich or rocky Planetary Ring Systems.
Which mineral is found in monazite?
The thorium mineral sand is contained in the monazite sand.
How is monazite processed?
3. Processing of monazite concentrate. As the monazite contains rare earth metals along with other metallic values, their recovery is carried out from such materials by pyro/hydrometallurgical processes consisting of heat treatment followed by leaching, precipitation, solvent extraction, etc.
Where is uranium mostly found in India?
India has uranium reserves in Rajasthan, Jharkhand, Chhattisgarh, Meghalaya, Telangana, Andhra Pradesh and Karnataka. It is currently operating mines in Jharkhand and Andhra Pradesh.
Which state is the largest producer of monazite?
Kerala is a state in south India on the Malabar Coast and is the twenty-fifth largest state having an area of 38,863 sq. km. The soil in Kerala is acidic, having high phosphate capacity and low water holding capacity, and has the largest reserves of monazite in India.
Which sand in Kerala is rich in thorium?
Monazite sands comprise of phosphate minerals of elements such as cerium which occur as small brown crystals in the Kerala sands (these monazite sands are mined for both cerium and radioactive thorium oxide).
Why are there no thorium reactors?
Thorium cannot in itself power a reactor; unlike natural uranium, it does not contain enough fissile material to initiate a nuclear chain reaction. As a result it must first be bombarded with neutrons to produce the highly radioactive isotope uranium-233 – ‘so these are really U-233 reactors,’ says Karamoskos.
What is monazite crystal structure?
Description of the monazite structure
The monazite-type compounds crystallize in a monoclinic lattice with space group P21/n (Z = 4). This structure was first reported by Mooney in the framework of the Manhattan Project and latter published in 1948.
How do you pronounce Cleveite?
- Phonetic spelling of cleveite. c-le-v-eite. …
- Examples of in a sentence. …
- Translations of cleveite.
What is a monazite sand?
: a yellow to red or brown mineral that is a phosphate of thorium and various rare earth elements and occurs especially in sand and gravel deposits.
Is pitchblende a mineral?
Pitchblende, amorphous, black, pitchy form of the crystalline uranium oxide mineral uraninite (q.v.); it is one of the primary mineral ores of uranium, containing 50–80 percent of that element.