Rainbow Beach, Queensland, Australia, 15 km long beach famous for the rainbow-coloured sand dunes. The colors stem from the rich content of minerals in the sand, such as rutile, ilmenite, zircon, and monazite. Astrogeo pos for fl 2: fire sign Sagittarius sign of arcs, rainbows, full & semi-circles, style, design fashion, composition. 2nd coord. in air sign Gemini - sign of sign-posts, opposites.