What's the difference of this chemical formula?

[Jimin Lee]

Homework Statement

I found out that Bauxite has 2 formula,
which one is 2Al(OH)₃,
and the other one is Al₂Si₂O₅(OH)₄⋅2H₂O.

What's the difference of these formula?

Homework Equations

The Attempt at a Solution

 

[Borek]

Exact composition of bauxite depends on the deposit it is taken from.