K
I have two sacks like this in the garage but I have no idea what's in them! Can anyone shed some light on this? (the second image shows the contents)

A white Sibelco bag placed on a concrete floor in a garage, surrounded by a bike and metal grating. Close-up of loose gray granular material inside a sack, possibly sand or gravel.
 
It is blasting media, i.e. slag used as blasting sand.
 
It is a blasting medium, likely fajalite. Iron silicate.
 
K
Thank you!!!
 
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