also: じねんせき
noun
fieldstone; natural stone
Refers to stone in its natural, unprocessed state, as opposed to artificial stone (人造石). Often used in landscaping, construction, or decorative contexts.
See also: 人造石
庭に自然石を敷いて歩道を作った。
I laid natural stones in the garden to make a path.
この壁は自然石
This wall is built by stacking natural stones.
人造石 is artificial or manufactured stone, while 自然石 is natural, unprocessed stone.
Compound of 自然 (natural) and 石 (stone). The reading しぜんせき is the standard on'yomi combination; じねんせき uses an older reading for 自然.