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