Animal Vegetable or Mineral?

Animal Vegetable or Mineral?

Observation - Animal Vegetable or Mineral? - UK and Ireland. Description: Milky appearance of pools on causeway to Worms Head, Gower, at low tide and white 'filaments' around the edge of some pools.

Milky appearance of pools on causeway to Worms Head, Gower, at low tide and white 'filaments' around the edge of some pools.