Question

Which of them is a mineral of lanthanum?
A) Monazite
B) Xenotime
C) Euxenite
D) All of the above

Answer 1

Lanthanum is a chemical detail with the image La and atomic quantity$57$. It is soft, ductile, silvery-white steel that tarnishes slowly whilst uncovered to air. It is the collection of $15$ comparable factors among lanthanum and lutetium inside the periodic table, of which lanthanum is the primary and the prototype. Lanthanum is historically counted a number of the uncommon earth factors.

Complete answer:
Monazite is a more often than not reddish-brown phosphate mineral that carries uncommon-earth factors. Due to variability in composition, monazite is taken into consideration a collection of minerals. The maximum not unusual place species of the organization is monazite-($Ce$), that is, the cerium-dominant member of the organization. It happens generally in small remote crystals. It has a hardness of $5.0$ to $5.5$ at the Mohs scale of mineral hardness and is notably dense, approximately $4.6$ to $5.7$ g/cm3.
Monazite is an essential ore for thorium, lanthanum, and cerium. It is regularly located in placer deposits. India, Madagascar, and South Africa have huge deposits of monazite sands. The deposits in India are specifically wealthy in monazite.
Monazite is radioactive because of the presence of thorium and, much less commonly, uranium. The radiogenic decay of uranium and thorium to steer permits monazite to be dated thru monazite geochronology. These domain names may be dated to benefit perception into the geologic records of its host rocks because, in their excessive density, monazite minerals listen in alluvial sands whilst launched via way of means of the weathering of pegmatites.

Note:
These so-referred to as placer deposits are regularly seaside or fossil seaside sands and comprise different heavy minerals of business hobby consisting of zircon and ilmenite. Monazite may be remoted as an almost natural listen via way of means of using gravity, magnetic, and electrostatic separation.