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Third time lucky!

0 votes

Thank you, I don't know why I couldn't work that out!  I don't know where this was found as it was in a box if stuff left in a house I bought but I live in Cornwall UK if that helps.

related to an answer for: Thanks, however....
asked Aug 22, 2017 by Newbie (160 points)

2 Answers

0 votes
It looks to be sedimentary. It looks like shale or coal. If you could answer a few questions, is it magnetic? Is it heavy compared to other rocks of comparable size. Maybe tin.

So, I typed in raw tin and found a specimen like yours. It is weakly attracted to a magnet, paramagnetic as opposed to ferromagnetic. Tin production in Cornwall is ancient..
answered Aug 22, 2017 by Weasel (58,360 points)
edited Aug 22, 2017 by Weasel
0 votes
Can you post some better pictures? That will give us some better cues. It could be anything such as goethite, hematite, manganese-oxide minerals, etc.
answered Oct 27, 2017 by hershel (52,700 points)