Apejuwe: Okuta folkano ti a mọ nigbagbogbo bi okuta pumice, okuta basalt, tabi apata lava, 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, ohun alumọni, kalisiomu, titanium, manganese, iron, nickel, cobalt ati molybdenum ati bẹbẹ lọ.eyiti a lo pupọ si ọgba, ilẹ, odi, ọgbin, ile-iṣẹ acqurium. .

Iwọn okuta folkano: 3-6mm, 6-8mm,8-10mm,1-3cm,3-6cm,6-8cm,8-10cm,10-50cm le ṣe adani.
oninaokutaawọ: pupa, dudu.
oninaokutaAra: odidi, patiku, lulú, dì