Coal or Jet Stone????? Please help

MeganL

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May 22, 2018
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Primary Interest:
All Treasure Hunting
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Found on beach in south Florida, large and light weight. Streaks brown on white paper. Very curious as to what this is, anything helps!
 

I was going to say bitumenous coal, but the streak should be black, not sure if it makes a difference if the streak is on paper or porcelain. Someone else might know.
 

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Jet does leave a dark brown streak.Jet is also porous,put a drop of water on it see if it soaks in.You can also touch a red hot needle to it and see if it smokes.
 

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