Builders vermiculite

I recently removed an old fire place. It was insulated with vermiculite so I’ve got a few bags of it. It was below the flue so it’s not covered in soot.
Do you think it’s safe to use in the garden for veg in pots etc?
Thanks in advance
Do you think it’s safe to use in the garden for veg in pots etc?
Thanks in advance
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I used it every year as a child when sowing seeds - it worked fine.
The insulation was pretty depleted by the time I left home aged 30 😁
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.