Free Worldwide Shipping on Orders Over $38 USD · Trusted by 2,000+ Collectors · ★ Top-Rated Etsy Seller

Monazite

Crystal system · Monoclinic

Monazite is a phosphate mineral prized by collectors for its exceptional color range, with several world-class Chinese localities.

About Monaziteextended article

China-iconic

China is a defining locality for Monazite · 独居石. See the Chinese collector page →

Market availability: Rare
Sought after; limited supply. Major shows and specialist dealers only.
Collector tier: Micromount / Niche
Best appreciated at thumbnail or smaller scale — often dull-colored, sub-millimeter, or radioactive. Specialist appeal.
Geological setting
CarbonatitePlacer
Diagnostic properties
Mildly radioactive
Crystal system
Monoclinic

Monazite is a light-REE phosphate and one of the two principal sources of cerium-group rare earths (alongside bastnäsite). It is mildly radioactive and serves as a key target mineral for U-Th-Pb geochronology.

Occurrence in China

Monazite occurs at Bayan Obo (Inner Mongolia) intergrown with bastnäsite, and at Maoniuping (Sichuan) as carbonatite-hosted crystals. Coastal placer deposits in Guangdong and Hainan historically supplied monazite-rich heavy mineral sand. Globally also at Madagascar, Brazil and India.

Identification

Yellow-brown wedge-shaped monoclinic crystals, high density (~5 g/cm³), and weak radioactivity distinguish monazite from xenotime (tetragonal, lower density) and zircon (tetragonal, much harder).

Collector Notes

Madagascar produces the largest gemmy monazite crystals, but Maoniuping yields jewel-like stubby crystals on matrix. Often paired with bastnäsite and aegirine in displays.

Export:BibTeXRIS
External research links for Monazite
Published: May 6, 2026 · Last reviewed: May 6, 2026
Editorial standards & sources →

About Monazite

Monazite is a phosphate mineral in the monazite group and has the chemical formula (Ce,La,Nd,Th)PO4. It crystallizes in the monoclinic system and is one of the most visually varied minerals in the collector market. Its combination of structural character and global distribution make it a recognized species in both systematic and aesthetic collections.

Identification & care

Crystals commonly develop as tabular to prismatic crystals; typically small rounded or prismatic grains in granites and pegmatites; also as detrital grains in placer sands. Its color range is broad, including yellow-brown, reddish-brown, pale yellow, honey-brown, dark brown, and rarely colorless. The luster is resinous, waxy, vitreous, the streak is white to pale yellow, and specimens range from translucent to opaque. The cleavage is distinct {100}, imperfect {010}. The fracture is subconchoidal to uneven, which aids identification.

Collector context

How it forms

Monazite forms in granites, granitic pegmatites, carbonatites; also in metamorphic rocks (gneisses, schists); extremely resistant to weathering — concentrates in heavy mineral placers; most important lree ore mineral. It is commonly found in association with zircon, xenotime, thorite, apatite, ilmenite, rutile, allanite.

Classic Chinese localities

Documented Chinese occurrences are recorded at Shangbao Mine, Xianghualing Sn-polymetallic ore field and Dachang ore field, among others.

Why collectors care

Collectors pursue Monazite for the clarity of its crystal form and, in good material, saturated color that reads instantly across a display case. A well-terminated monazite on clean matrix photographs well, identifies quickly, and anchors a cabinet piece. Top Chinese specimens over the last two decades have reset the bar for what monazite looks like at collector grade.

What affects value

Value in Monazite is assessed, in typical order of weight, against: (1) locality provenance; (2) size relative to the species norm; (3) crystal form and termination sharpness; (4) color saturation and zoning; (5) transparency and internal clarity; (6) matrix quality and aesthetic balance; (7) condition (absence of damage, chips, or repair). Cleaning quality and verified locality documentation act as multipliers across the above.

Naming history

The name Monazite has a specific etymological and historical context — see Mindat's reference entry for provenance details. We have retained naming data at the record level; published prose is paraphrased from factual fields rather than copied from source.