Saturday/ hematite pebbles

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Hematite is the mineral form of iron (III) oxide (Fe2O3) and exhibits permanent magnetic properties.

I checked out these little hematite pebbles (ground into rhomboid shapes) at a little gem and jewelry store at Sea-Tac airport when I came in on Thursday.  Once you start playing with them, they are hard to put down (and so I had to buy a few!).   The pebbles are magnetic, and immediately stick to each other if they get within a range of two inches or so.  Electro-magnetism is one of the four forces between particles in our physical universe : electromagnetism, gravitational, weak nuclear and strong nuclear.

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