Anyone know the more common name for this type of rock?
www.olibetta.uk
The site is Austrian so I'm not sure if something is being lost in translation. It calls them "sand drawing rock", but a Google for that doesn't come up with anything that I can find. I love the look of them but want to do a bit more digging into inertness and potentially find some a bit more local.
Thanks.

SAND DRAWING ROCK 120er
Natural Stone Decor for Aquascaping. Price: £25.50. Sizes: 60er - 120er. Free delivery from £42.90.

The site is Austrian so I'm not sure if something is being lost in translation. It calls them "sand drawing rock", but a Google for that doesn't come up with anything that I can find. I love the look of them but want to do a bit more digging into inertness and potentially find some a bit more local.
Thanks.