greensand (olive-green sandstone)
Geological term for a specific type of sandstone containing glauconite, giving it a greenish color.
The greensand in this region contains a lot of iron.
green sand; molding sand
Foundry term for sand used in casting molds, often mixed with clay and water.
The foundry reuses the green sand.
Compound of 生 (raw, unprocessed) and 砂 (sand). The reading きずな is irregular and its origin is uncertain.