Garden stones, broken stones, rock garden

I had trouble disposing of a garden stone, so I broke it into pieces, and these are the resulting sizes.
I'm not knowledgeable about stone types, so I'm not sure, but some of them are bluish with some white parts.
Please refer to the second photo for the size.

I believe there are many potential uses, such as for rock gardens, as a focal point in landscaping, or for placement in a biotope tub.
Since these are broken pieces, the edges will be rough and not rounded.
Photos 1 through 4 show the stones when dry, and photos 5 onwards show them when wet. When wet, they become a deeper greenish-blue color.