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Extremely heavy brown beach rock
  
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Gill Ferguson




Joined: 19 Mar 2021
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Location: Northumberland

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PostPosted: Mar 20, 2021 04:20    Post subject: Extremely heavy brown beach rock  
It was found on a Northumberland beach 2 years ago amongst the brown clay mixed in but this is a rock. Extremely heavy, smooth, brown, some pits in it. Not magnetic, impossible to chip any off. Does not look like any rock and I've scanned many databases. Measures 17cm long (see pics) just want to know what it is and why so heavy!

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James Catmur
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PostPosted: Mar 20, 2021 05:41    Post subject: Re: Extremely heavy brown beach rock  
Gill

Probably an ironstone goethite nodule - I find them in Fife, Could you check the streak and hardness?

Tests 7 and 8 on this page and the results I expect you to get are:

Streak: yellowish-brown, orange-yellow, ocher-yellow
Hardness: 5 - 5½ on the Mohs scale

https://www.mineral-forum.com/message-board/viewtopic.php?p=19487#19487

James
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alfredo
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PostPosted: Mar 20, 2021 19:47    Post subject: Re: Extremely heavy brown beach rock  
I agree with James. It does look a lot like an ironstone nodule.
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