Monazite

Also called: Monazite sands · Topic: Mineral Resources of India: Distribution and Conservation · NCERT: Class 10, Ch 5 "Minerals and Energy Resources"; Class 12, Ch 5 "Mineral and Energy Resources"

Meaning

Monazite is a heavy, phosphate mineral found mostly in beach sands. It is the main source of thorium and rare earth elements (REEs).

It matters because India has little uranium but a lot of thorium, and nearly all of that thorium is locked in monazite. Monazite also holds most of India's rare earth reserves. Rare earths are needed for the magnets used in electric vehicles (EVs), wind turbines and defence equipment.

Explanation

What monazite contains

• Monazite is a phosphate mineral, so its chemical base is phosphate.
• It holds about 55–60% total rare earth oxides and about 9–10% thorium oxide [3].
• Thorium is radioactive, so monazite sand is mildly radioactive too.
• Thorium is a prescribed substance, which means only the Department of Atomic Energy (DAE) may handle it [3].
• Because of this, monazite counts as an atomic mineral (a mineral that holds elements used for nuclear energy).
• The Atomic Minerals Directorate for Exploration and Research (AMD), a DAE unit, finds and measures deposits of thorium and of the rare earths that contain uranium and thorium [5].

How monazite sands form (cause → process → result)

• Cause: rivers wear down the old crystalline rocks of the Peninsula and carry the broken grains to the sea.
• Process: waves and currents wash the beach again and again.
• Light quartz sand gets carried away.

• Heavy grains such as monazite, ilmenite and zircon stay behind.

• Result: a placer deposit forms. This is a layer of sand rich in heavy minerals (minerals denser than ordinary quartz sand).

• So monazite is a beach-sand mineral. It occurs alongside:
• ilmenite and rutile, which give titanium
• zircon, which gives zirconium
• garnet, which is used to grind and polish (an abrasive)
• sillimanite, which is used to make heat-proof bricks (refractories)

Why thorium and rare earths from monazite matter

• Thorium → nuclear energy:
• Thorium is meant to fuel Stage 3 of India's three-stage nuclear programme.

• IREL makes nuclear-grade thorium oxide and sends it to BARC and the Nuclear Fuel Complex, where thorium fuel is being developed [3].

• Rare earths → magnets:

• REEs are 17 metals: the 15 lanthanides (lanthanum to lutetium) plus scandium and yttrium.
• They are used in neodymium-iron-boron (NdFeB) permanent magnets for EV motors, wind turbines, electronics and defence. Magnets are the biggest use of rare earths worldwide [6].

Who may mine and process it

• Since 2019, only government bodies may mine beach sands that contain monazite. In practice this mostly means IREL (India) Ltd. The rule comes under the Atomic Minerals Concession Rules, 2016.
• IREL is fully owned by the DAE. It is the only company in India that processes monazite into rare earth compounds and thorium [3].

Where it occurs

India: resource size

• India has about 13.15 million tonnes of monazite, holding about 7.23 million tonnes of REO (rare earth oxide) equivalent [3].
• In 2023, India held about 6% of the world's rare earth reserves, mostly in monazite sands [4].

NCERT locations

• NCERT says the world's richest monazite deposits are in:
• Palakkad and Kollam (Kerala)
• the area near Visakhapatnam (Andhra Pradesh)

• the Mahanadi delta (Odisha)

• Correction: Kerala's monazite belt is really the Chavara–Neendakara coast of Kollam and Alappuzha. Palakkad is inland and is not part of this coastal belt. Still, give the NCERT pairing ("Palakkad and Kollam") if an exam question uses it.

Types of deposit [3]

• Coastal beach sands and teri (red sand dunes) in Kerala, Tamil Nadu, Odisha, Andhra Pradesh, Maharashtra and Gujarat.
• Inland alluvium (sand and silt left by rivers) in Jharkhand, West Bengal and Tamil Nadu.

Main beach-sand mining centres

• Chavara: Kerala
• Manavalakurichi: Kanniyakumari district, Tamil Nadu
• Chhatrapur: Ganjam district, Odisha, where IREL runs the Odisha Sands Complex (OSCOM)
• In 2015, an OSCOM report put the monazite reserves at its own operations at 2,56,000 tonnes [6].

Processing plants

• IREL has plants at Aluva (Kerala) and Chatrapur (Odisha) [4].
• Kerala Minerals & Metals Ltd also makes heavy-mineral concentrates [4].

World context

• India mined 2,900 tonnes REO in 2025, out of a world total of 3,90,000 tonnes [6].
• China mined 2,70,000 tonnes in 2025, about 69% of world output [6].
• China holds 44 million tonnes of the world's more than 75 million tonnes of reserves (USGS 2026) [6].

Don't confuse with

• Ilmenite and rutile: these beach-sand minerals give titanium, not thorium. Monazite is the beach-sand mineral that gives thorium + REEs.
• Uranium ore: in India, uranium comes from hard Dharwar rocks (for example Jaduguda in Jharkhand and Tummalapalle in Andhra Pradesh). Monazite comes from loose placer sands on the coast.
• Thorium vs rare earth elements: monazite contains both, but thorium is not an REE. Neither is uranium. The 17 REEs are the 15 lanthanides plus scandium and yttrium.
• Zircon: another beach-sand mineral with a nuclear use. It gives zirconium for the zircaloy tubes that hold nuclear fuel, not the fuel itself. Monazite gives the fuel material (thorium).

Prelims Hooks

• Monazite is a phosphate mineral. It holds about 9–10% ThO₂ and about 55–60% REO [3].
• NCERT's richest deposits: Palakkad and Kollam (Kerala), near Visakhapatnam (AP), and the Mahanadi delta (Odisha). The real Kerala belt is Chavara–Neendakara (Kollam–Alappuzha coast).
• Place–state pairs: Chavara → Kerala; Manavalakurichi → Tamil Nadu; Chhatrapur → Odisha.
• Only monazite processor in India: IREL, a DAE company, with plants at Aluva and Chatrapur [3][4].
• Trap: thorium is a prescribed substance under the DAE [3], but it is not a rare earth element.
• Ownership rule: since 2019, only government bodies may mine monazite-bearing beach sands (Atomic Minerals Concession Rules, 2016).

Mains Points

• Thorium paradox (GS-III, energy):
• India has huge thorium reserves in monazite but little uranium. This is why the three-stage nuclear programme was designed.

• Stage 3, which runs on thorium, is still far away. So thorium stays mostly unused while India imports uranium.

• Strategic dependence on rare earths (GS-III):

• India holds about 6% of world rare earth reserves, mostly in monazite [4], but does almost no refining or magnet-making.
• China controls about 69% of world mining [6] and even more of the processing. Its 2025 export curbs left Indian EV makers short of magnets.

• India's response: IREL's monazite processing, more exploration, and the ₹7,280 crore REPM scheme for rare earth magnets [2].

• Coastal placer mining and the environment (GS-I/III):

• Beach-sand mining in Kerala, Tamil Nadu and Odisha can cause coastal erosion and radiation exposure, and it affects fishing communities.
• State-only mining since 2019 cuts illegal mining, but it may slow investment in the sector.

Related concepts

• Jaduguda uranium mine
• Beach sand minerals
• Rare earth elements
• Rare earth permanent magnet scheme

Read more

• Atomic and beach-sand minerals, and rare earths