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Can you identify this?

by Nicole
(Plainfield, IL)

I was previously told, it was 477G of natural green chalcedony grape agate. Is this true ir is it something else. Very interesting looking. I have seen shades of purple and green grape agate, but not like this and the 'grapes" are so large.

Thanks!

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Nov 23, 2020
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Grape Agate
by: Douglas

Nicole,

It does look like grape agate. A really nice piece too. Chalcedony is a term that applies to all agates. It just means that it is microcrystalline quartz. Your piece has a boytrodial crystalline structure. That refers to the bubbly appearance, (like grapes).

Here are some ways to test the id of your specimen.

Look at a geology map of the area where you found your specimen.

Learn about reading a geology map here:

https://www.rocksandminerals4u.com/geology-maps.html

Try testing for hardness. Agate (quartz) is a 7 on the mohs scale Learn how here: Test in an inconspicuous place, this is too nice to scratch up!

https://www.rocksandminerals4u.com/properties_of_minerals.html

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