http://www.10news.com/news/31076377/detail.html Rocks Found At Trestles Beach Ignite In Woman's Pocket Woman Put Rocks In Pocket After Her Children Picked Them Up From Beach How rocks collected from a southern Orange County beach caught fire in the pocket of a San Clemente woman's cargo shorts, landing her in a hospital with third-degree burns, remained a mystery Thursday. The 43-year old woman's children picked up the seven orange and green rocks on Saturday at San Onofre State Beach, which is popular with surfers and known locally as Trestles. The rocks combusted and set the woman's shorts on fire and continued to burn the wood floor of her Avenida Estrella house, according Capt. Marc Stone of the Orange County Fire Authority. Two of the rocks were found to contain phosphorous, which can burn like a road flare when ignited, but the other five were cross-contaminated while in the woman's pocket, according to ABC7.