Monazite is a phosphate mineral primarily valued as an ore for rare earth elements like cerium and lanthanum. It is commonly found as small, reddish-brown, wedge-shaped crystals in pegmatites or as rounded grains in heavy mineral sand deposits.
Is this monazite?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch monazite with a known reference. Monazite sits at Mohs 5-5.5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Monazite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Monazite typically shows a resinous luster.
- 4Match the color rangeCompare against the expected color range: reddish-brown, yellowish-brown, brown, tan, greenish.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: tabular, prismatic, or granular.
Often confused with
Monazite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Zircon is the harder of the two (Mohs 7.5 vs. 5-5.5); luster reads resinous on Monazite and adamantine on Zircon.
How to tell apart: Luster reads resinous on Monazite and adamantine on Titanite.
How to tell apart: Luster reads resinous on Monazite and vitreous on Xenotime.
Often found alongside monazite
Minerals reported to co-occur with monazite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- (Ce,La,Nd,Th)PO₄
- Mohs hardness
- 5-5.5
- Density
- 4.6-5.7 g/cm³
- Streak
- White
- Luster
- Resinous
- Transparency
- Translucent
- Crystal system
- Monoclinic
- Crystal habit
- Tabular, Prismatic, Or Granular
- Cleavage
- Distinct
- Rarity
- Common
- Uses
- Collector, Ore of Rare Earth Elements
- Host rock
- Granite, Pegmatites, And Heavy Mineral Sands
- Typical price
- $10-150 per specimen
Where rockhounds find monazite
9 mapped spotsClassic worldwide localities
- Brazil
- Madagascar
- USA
- Australia
- India
Field-hunting tip
Look in granite, pegmatites, and heavy mineral sands country — that is the host setting where monazite typically forms. If you start seeing quartz, zircon, ilmenite in float, you are in the right ground. Field specimens usually show a tabular, prismatic, or granular habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Utah, North Carolina, Idaho — start trip planning there.
Common questions
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Find monazite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
