Yellowish to reddish-brown color, vitre-ous to resinous luster, white streak.
物理的性質
Habit: crystalline, tabular, prismatic. Color: black, gray, brown, red, yellow, green, or
orange. Diaphaneity: transparent to opaque. Luster: adamantine, resinous (Th rich). Streak: grayish white. Cleavage: (001) distinct, (100) indistinct. Twinning: {100} common. Fracture: uneven, subconchoidal. Chemical: slightly soluble in hot conc. H2SO4. When
wetted by H2SO4, color the Bunsen flame in blue-green. Unfusible. Deposits: granodiorites,
syenites, granitic pegmatites, heavy mineral sands.
使用
Source of thorium, cerium, and other rare-earthmetals and compounds.
定義
A natural phosphate of the rare-earthmetals, principally the cerium and lanthanide met-als, usually with some thorium. Yttrium, calcium,iron, and silica are frequently present. Monazitesand is the crude natural material and is usuallypurified from other minerals before entering com-merce.
