How do hollow rocks form?

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Offline jrobi

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How do hollow rocks form?
« on: 02/11/2012 20:46:24 »
What is this?
« Last Edit: 19/12/2012 15:13:25 by chris »

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Offline RD

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Re: What is it?
« Reply #1 on: 02/11/2012 22:18:36 »
Dunno, but here it is with tweaked contrast / brightness / sharpness ...

[attachment=17226]
« Last Edit: 02/11/2012 22:20:51 by RD »

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Offline Bill S

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Re: What is it?
« Reply #2 on: 02/11/2012 22:39:25 »
Wild guess! Limonite/goethite/hematite which formed as the lining of a cavity.

Scratch a broken surface to see what colour the streak is.