amethyst color colorful colors colour colourful colours crystal crystalline decorative esoteric gem glitter Mineral ore pastel purple rocks shiny solid stone stones translucent algae beach cliff coastline eroded erosion Great Britain hillside natural nature Pembrokeshire sand sea seaweed shore united kingdom view wales water welsh blue coastal danger edge island rock summer surf wild calm canada canoe canoeists clear fun lake landscape leisure moraine mountains paddle peaceful pleasure Rockies sport tranquil chemical dock harbour industrial industry Jetty machinery manufacture mountain norway norwegian ocean process produce production quay refinery silo wharf Body of water Ecoregion Fluvial landforms of streams highland milford sound Natural landscape new zealand vegetation water resources waterfall Balearic Islands boulders dangerous harsh majorca mediterranean rough rugged Spain spanish spray spume waves white Athabasca boulder current deluge drop falls fierce flow plunge pour river Rocky Mountains torrent turmoil