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It's white power,light hygroscopic,able to absorb moisture and crbon dioxide from air.Its magnetism is much stronger than iron(III) oxide.Soluble in acid and ethanol.Mainly used in atomic energy i

It is mainly used in raw material of niobium, also used in optical glass and electronics industry.

It is mainly used in raw material of tantalum, as the catalyst in chemical industry, also used in the electronics industry. 

It's sepia powder, insoluble in water, soluble in acids.It's for making metal terbium, magneto optical glass, phosphor, magneto optical storage, chemical additives etc.

It's white powder, insoluble in water, soluble in organic acid.It's mainly used to make metal Gadolinium , Gd-Fe alloy , memory storage units , optical glasses ,solid state magnetic refrigerat