What is this heavy dark rock

oldbattleaxe

Sr. Member
May 26, 2010
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I had purchased a large box of petrified wood, geodes, and some small unusual rocks. This rock had caught my attention since it was very heavy for its size. A large magnet will not stick to it. I dangled a small magnet near it and it barely moves to the rock. There looks to be specs of iron or nickel all over it. I used a file on a small edge and it will not do much to it.
 

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Terry Soloman

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May 28, 2010
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Not a meteorite. Looks like Petrified wood.
 

Terry Soloman

Gold Member
May 28, 2010
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White Plains, New York
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Primary Interest:
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Petrified wood would not attract a magnet, correct?

" A large magnet will not stick to it. I dangled a small magnet near it and it barely moves to the rock."

You can magnetize almost any rock enough to "barely" move a small magnet. Could be shale with some mica in it. It is terrestrial though.
 

BloodMoon

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Mar 7, 2019
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Have you done a streak test? Scratch it vigorously on the unglazed side of a tile or you can even sometimes do it underneath your toilet seat. Does it leave any streak at all?

I had purchased a large box of petrified wood, geodes, and some small unusual rocks. This rock had caught my attention since it was very heavy for its size. A large magnet will not stick to it. I dangled a small magnet near it and it barely moves to the rock. There looks to be specs of iron or nickel all over it. I used a file on a small edge and it will not do much to it.
 

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oldbattleaxe

oldbattleaxe

Sr. Member
May 26, 2010
382
232
If it left a black streak, it’s most likely magnetite. In fact from the looks of it as well I think there’s a 99.9% chance it is. It dormant seem to be slag. Not a meteorite though.
Thanks for all of the help forum. SOLVED
 

Al D

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If you measure the angles of your specimen, you will see that it has a cubic structure, you can do this with any terrestrial rock if it has an angle resulting from a break.
meteorites usually do not exhibit any geometric structure, so a specimen which exhibits nice angles is not a meteorite.
but, as the disclaimer goes, there are some which came from Mars which could have such a structure since Mars formed similar to Earth. There seems to be an exception with everything, keep looking, they are out there. :icon_thumright:
 

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