Could a beach have green or blue sand due to a nearby copper deposit? How poisonous would such a beach be? [closed]








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I am in the midst of a world building project and am wondering about green sand from copper oxide/patina material. The material could either be washed into the water from a nearby land deposit or be coming from an exposed deposit on the lakebed or seafloor. Would it be possible to have vibrant blue or green, or would the particles break down onto something of more boring color? How poisonous would such a beach be with a high copper concentration? How would the salinity of the water affect the situation?
Any answers would be much appreciated. I haven't been able to find any real-world examples of this happening.


