Apejuwe: Okuta folkano ti a mọ nigbagbogbo bi pumice tabi basalt la kọja, o jẹ iru iṣẹ ṣiṣe ati ohun elo ayika.O ni awọn dosinni ti awọn ohun alumọni ati awọn microelements, gẹgẹbi iṣuu soda, iṣuu magnẹsia, aluminiomu, silikoni, kalisiomu, titanium, manganese, irin, nickel, cobalt ati molybdenum ati bẹbẹ lọ.
Akoko ifiweranṣẹ: Oṣu Kẹta-10-2022