silka -sik- gismu

x₁ is a quantity of/contains/is made of silk produced by x₂.

See also curnu, bukpu, cilta.

jbovlaste

In notes:

bukpu: x₁ is an amount of cloth/fabric of type/material x₂.
cilta: x₁ is a thread/filament/wire [shape/form] of material x₂.
curnu: x₁ is a worm/invertebrate animal of species/breed x₂.
bukcilta: c₁ is a thread of fabric material c₂=b₂.