сангин

Ин девори сангин мебошад.
This is a stone wall.
Бибии ман дар хонаи сангин зиндагӣ мекунанд.
My grandmother lives in a stone house.

Bonus:
дили сангин: stone heart, heart of stone
асри сангин: Stone Age (аср: century)

You can add the suffix ин to some nouns to make them into adjectives –
санг – сангин: stone – stone (adj.), stony
ранг – рангин: colour – colourful
чирк – чиркин: dirt – dirty
чӯб – чӯбин: wood – wooden
мармар – мармарин: marble – marble (adj.), made of marble

If the noun ends in a vowel then the suffix is гин
нуқра – нуқрагин: silver – silver (adj.), made of silver
тилло – тиллогин: gold – golden, made of gold