[0_____0]

So does fiberglass. I would dislike working with the aforementioned basalt fiber, I suspect it's like fiberglass or carbon fibers in that you'll end up itchy later, unless you do a really good job with your PPE e.g. taping gloves to your sleeves.

[p0w3n3d]

Hmm I have fiberglass mittens for oven... Should I be scared?

[0_____0]

Are you itchy after you use them? If not then you're good. If they're reeeeally old then you should make sure they aren't asbestos.