general/sandstone

Stones used to scrub wooden ships' decks

Stones used to scrub wooden ships' decks

Sedimentary sandstone conglomerate formed during the Cretaceous period

Type of sedimentary rock

Sandstone with angular grains in a clay-fine matrix

Stones used to scrub wooden ships' decks

Stones used to scrub wooden ships' decks

Stones used to scrub wooden ships' decks

Hard, fine-grained quartzose sandstone, or orthoquartzite

Sand or sandstone which has a greenish color