curtis
Registered

I think it's closer to something like this: Black Basalt Aggregate 1- 3 MM - Available in 25 kg bags, or pallet quantities. Bulk Bags please call for details and availability.
Essentially, basalt gravel so I'd say solid as opposed to soft like perlite. My terrible German says the literal translation "split fungus" is correct but the manifestation is different. I defer to a native German speak or resident to correct me though.
EDIT: I was wrong, 'Fugen' isn't fungus in this, it's the plural of Fuge meaning gap. It's essentially the filter used between paving slabs.
Essentially, basalt gravel so I'd say solid as opposed to soft like perlite. My terrible German says the literal translation "split fungus" is correct but the manifestation is different. I defer to a native German speak or resident to correct me though.
EDIT: I was wrong, 'Fugen' isn't fungus in this, it's the plural of Fuge meaning gap. It's essentially the filter used between paving slabs.