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SAN ONOFRE, Calif. -- 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.
Has anyone heard of this before? I wondering if they were hot or even warm when they were picked up?
(covered here at SkepDic)
Some alleged cases of SHC are cases of spontaneous combustion but they are explicable by natural means. For example, a chemical reaction on or in a person's clothing can result in spontaneous combustion. The National Geographic special, mentioned above, investigated a case of a woman whose clothes suddenly caught fire and burned the skin on her thigh. The most likely explanation is that she put a shell in her pocket that was covered in sodium from a fireworks show that had taken place on the beach where she had retrieved the shell. Later, she stuck a wet handkerchief in her pocket with the shell. The sodium may have reacted with the water, releasing hydrogen that self-ignited,* causing her burns. In any case, she did not burn from the inside, as is claimed happens to SHC victims.
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.
The rocks were smooth and some were the size of a hamburger patty, while others were small enough to fit in a coffee cup, according to news reports.
"There is phosphorous that naturally occurs on the sand at the beach, but no one has ever heard of pants catching fire," Stone told the Orange County Register
Originally posted by isyeye
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.
The rocks were smooth and some were the size of a hamburger patty, while others were small enough to fit in a coffee cup, according to news reports.
"There is phosphorous that naturally occurs on the sand at the beach, but no one has ever heard of pants catching fire," Stone told the Orange County Register
It doesn't take too much to ignite phosphorus. The friction of the "rocks" inside the woman's pocket probably causes a spark igniting the phosphorus, and then caught her pants on fire. Nothing too mysterious or strange....but that had to be a frightening feeling.
Phosphorus when it is under water is quite safe, i saw a physics teacher accidentally drop a piece after taking it from a jar of water, within 3-5 seconds of the air acting on it, it caught fire, exposure to air will have it burning fully in a very short space of time, it does not need a source of ignition in its purest form, oxygen lights it.
Originally posted by Bob Sholtz
are you sure you're not thinking of potassium, and the teacher had it stored in a jar of oil? phosphorus will faintly glow when exposed to air, but i don't believe it can ignite. potassium on the other hand...breaks down water into hydrogen and oxygen while releasing heat, which then ignites the released gasses.
Originally posted by woogleuk
I remember a couple of years back some loose change in my pocket suddenly became red hot for no reason, I felt it getting suddenly hot against my leg and when I pulled it out quick it burnt my fingers. Still haven't found an explanation for that to this day.
Strange things huh.