砕石

1. Origins, structure, and basic meaning

• Structure: Written 砕石 and read さいせき, it is stone mechanically crushed and graded for construction or surfacing.
• Basic usage: It is unloaded as building material and spread finely along a model path.

2. Common pitfalls and similar expressions

• Crushed stone rather than natural gravel
  • It is deliberately broken and often angular, unlike pebbles rounded by natural wear.