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ID this rock
Posted by: Sanderling
Date: March 08, 2015 06:57PM
Found this rock lying in the grass in St. Augustine, Florida. Looked out of place for that area. Thinking it might be chert. Anyone know?




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Re: ID this rock
Posted by: KinTN
Date: March 11, 2015 09:25AM
Some form of microcrystalline quartz, so I agree with chert until more info comes in.
Nice quality photo, btw.



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Re: ID this rock
Posted by: Sanderling
Date: March 12, 2015 09:17AM
Thanks KinTn. Using the green cloth backround really helps with the quality of the photos. I had sent this to a local college to the director of the rock and mineral museum, but she never responded. I did learn that chert comes in different forms with different appearances. Appreciate the feedback.

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Re: ID this rock
Posted by: KinTN
Date: March 12, 2015 07:52PM
Keep an eye open for gem and mineral shows in your area. They almost always have a table that will ID your stuff for you for free. ID'ing rocks with just a pic is pretty iffy.



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Re: ID this rock
Posted by: Explorer
Date: May 30, 2015 03:36PM
Looks like chert to me! Quickly strike its thin edge across a hard metal file and it should throw sparks. Simple way to verify chert and its associate minerals.



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Re: ID this rock
Posted by: Dustinscottt
Date: August 13, 2016 10:55PM
Piece of Flint, been napped on the bottom edges. More than likely used as a scraper.

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