Celestite is one of the stones we import directly from Madagascar.  It's pretty luscious and beautiful.  It's a cousin of angelite, but more like angelite and quartz had a baby.  It usually forms in geodes with all these awesome sparkly sky blue crystals within it. 

I use celestite in the same way I would use angelite, specifically, any instance where I want angelic, spiritual, or Divine assistance, intervention, or enhanced interdimensional communication.  I like both angelite and celestite, but celestite has the added benefit of forming in points, like quartz.  Point and cluster formations have value added in energy work, crystal grids, or directing energy in some way.  It corresponds to the throat chakra, which deals with communication, in general.

Celestite plays well with:
Ocean Jasper
Polychrome Jasper
Labradorite
Rose Quartz
Smoky Quartz
Elestial Quartz
Citrine
Angelite
Selenite
Moldavite
Tektites