Bastnaesite
Chemical Formula	(Ce,La,Y)CO3F
Species	Carbonates
Crystal System	Hexagonal
Mohs Scale	4-5
Specific Gravity	4.95-5.0
Color	Honey-yellow, reddish brown
Streak	White
Luster	Vitreous, greasy, pearly on basal partings
Refractive Index	nω = 1.717–1.722nε = 1.818–1.823
Diaphaneity	Transparent to translucent
Cleavage	Imperfect to indistinct on , parting on
Fracture	Uneven
Crystal Habit：Tabular to equant striated crystals, also granular, massive