gritstone

The old mill was built with local gritstone, which has weathered beautifully.

用法提示：gritstone作为名词，指建筑用的粗砂岩。

Gritstone is often used for sharpening tools because of its abrasive texture.

用法提示：gritstone作为不可数名词，表示材料。

These gritstones from the quarry are perfect for paving the garden path.

用法提示：gritstones作为复数形式，指多块粗砂岩。