(Ce, La, Nd, Th, Y)PO 4.It appears in a small amount as an accessory mineral in many igneous, metamorphic and sedimentary rocks. Its interference colors commonly seem anomalously bright compared to pyroxenes, possibly a result of the high dispersion of the 2V. Monazite is a rare phosphate mineral with a chemical composition of (Ce,La,Nd,Th)(PO 4,SiO 4).It usually occurs in small isolated grains, as an accessory mineral in igneous and metamorphic rocks such as granite, pegmatite, schist, and gneiss.These grains are resistant to weathering and become concentrated in soils and sediments downslope from the host rock. Partly metamict monazite has been reported, however, with a low birefringence and n 1.79. Monazite-(Ce) (Ce,La,Nd,Th)PO4 c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Monoclinic; metamict if thorium-rich. What is Monazite? The thin sections have been observed using polarization microscopy and two different types of monazite were discovered. Fig. 3 (A) shows that with the exception of one reversely discordant analysis, the remaining data points are either concordant or near-concordant. Monazite is a rare-earth-element phosphate mineral, with the chemical formula e.g. The first type appears as small Crystals typically tabular on {100}, may be prismatic, equant or wedge-shaped, to 27 cm; granular, massive. Twinning: Common, {100} as twin and composition plane, as contact twins. Thin sections 3c and 3b repre-sent a migmatite gneiss with two different phases, mesosome and leucosome. In most flood plains, gravel forms a thin veneer on saprolitic bedrock and is overlain by 10-20 feet of the other sedi­ The refractive indices are high and are increased by the entry of Th. In situ petrographic thin section U–Pb dating of zircon, monazite, and titanite using laser ablation–MC–ICP-MS Monazite is typically light yellow or yellowish brown in thin section or in grains, but rarely shows any appreciable pleochroism. sjöstrand and thin sections have been made from rock samples to study the mineral. Point Group: 2/m. With a section on Mineral Analyses By JEROME STONE GEOLOGICAL SURVEY PROFESSIONAL PAPER 568 ... Monazite in crystalline rocks._____ 24 ... cent gravel. ... or monazite (no halos visible here). Monazite grain #1 from thin section #1 yielded an upper intercept 207 Pb/ 206 Pb age of 1801.4 ± 8.4 Ma (2σ), which falls within the range of monazite ID-TIMS dates reported for this sample . Although commonly light yellow-green in thin section, it may be colorless. Tabular on { 100 }, may be prismatic, equant or wedge-shaped, to 27 cm granular! Chemical formula e.g polarization microscopy and two different types of monazite were discovered increased the! 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