Phosphorous is the most common element in road flares. A woman who was reportedly burned from rocks collected at San Onofre State Beach also reported that she went to the pool after the beach. The combination of phosphorous and chlorine may have created the problem.
Phosphorus trichloride is a chemical compound of phosphorus and chlorine, having chemical formula PCl3 and is classified as very toxic and corrosive. It is possible that the burning was due to corrosives and not flame.
I have license as an engineering geologist in California. I actually went to Trestles this weekend in search of the “dangerous” rocks. I am convinced that this is an isolated incident. Please follow me and I welcome your comments.
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