land pebble phosphate

land pebble phosphate

[′land ¦peb·əl ′fäs‚fāt]
(geology)
A pebble phosphate in a clay or sand bed below the ground surface; a small amount of uranium is often present and is recovered as a by-product; used as a source of phosphate fertilizer. Also known as land pebble; land rock; matrix rock.