zalvi -zal- gismu

x₁ [individual or mass of hard surfaces] grinds/pulverizes/crushes x₂ into powder x₃.

May need mosra tanru. See also daspo, purmo, marxa, pulce, canre, molki.

In notes:

canre: x₁ is a quantity of/contains/is made of sand/grit from source x₂ of composition including x₃.
daspo: x₁ (event) destroys/ruins/wrecks/despoils x₂; x₁ is destructive.
marxa: x₁ [force] mashes/crushes/squashes/smashes x₂ into pulp/mash/crumbs/deformed mass x₃.
molki: x₁ is a mill/foundry/industrial plant/[assembly line] performing process x₂.
pulce: x₁ is dust/precipitate [suspensible solid] from x₂ in medium/on surface x₃.
purmo: x₁ is a powder of material x₂.