Rock identification from Jamaica

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Offline mpunt

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Rock identification from Jamaica
« on: 25/08/2014 18:50:53 »
My parents brought home some rocks for my daughter from Jamaica.  If anyone could let me know what they are, I'd appreciate it.  I think the top two are different from the bottom two.  The white lines on the upper two turn blue when wet as evidenced by the upper right rock.  The bottom two do not change color. 
Thanks

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Offline RD

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Re: Rock identification from Jamaica
« Reply #1 on: 03/09/2014 19:29:16 »
Maybe try a forum specific to mineralogy , e.g. ... http://www.mindat.org/msgboard-9.html

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Offline RD

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Re: Rock identification from Jamaica
« Reply #2 on: 04/09/2014 06:55:46 »
If you are trying to identify what type of rocks they are from their appearance a mineralogy forum may be able help ...

Quote from: wikipedia.org
Mineralogy is a subject of geology specializing in the scientific study of chemistry, crystal structure, and physical (including optical) properties of minerals.
http://en.wikipedia.org/wiki/Mineralogy

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Offline mpunt

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Re: Rock identification from Jamaica
« Reply #3 on: 04/09/2014 15:01:31 »
Ok thanks for the info.