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Home School Life Journal ................................................................................................................painting by Katie Bergenholtz

Thunderegg

In the Pay It Forward package that received from Makita of Academia Celestia there was a Thunderegg. This morning we decided to crack it open. 

 It was very hard and took quite a bit of hammering to get it to crack.

See how solid they are!
I had always thought that Thunderegg was just another term for a geodes. After researching a little, however, I found out that, geodes are hollow or near-hollow, crystal-lined cavities found in igneous and sedimentary rocks. Thundereggs,on the other hand, are solid or near-solid nodules formed by magmatic and volcanic processes and are found only in volcanic rocks Thundereggs are also known as spherulites, which are radial crystals extending from the center. The minerals forming the crystals in Thundereggs could have come from hot water moving through cracks in the cooling lava rock, or later when mineralized groundwater oozed through. Either way, quartz and other minerals precipitated out of the water into the thunderegg cavity. The crystals began to grow.


Indians found solid nodules near Mt. Jefferson and Mt. Hood in Oregon and thought that when the gods or spirits who inhabited the mountains became angry with one another they would hurl nodules at each other with accompanying thunder and lightning. Hence they called these nodules thundereggs.


 We also decided to make our own geodes, loosely following the directions from Those Northern Skies. 
I had a hard time, however, gathering enough eggshells, so I decided to try them with plastic eggs.
If you would like to see more about this, click here.
 

Science Sunday

5 comments:

  1. I'm curious to see how this turns out!

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  2. I hope the plastic eggs work!

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  3. Thanks for the info about the thundereggs...very neat! I'll be curious to see how the egg geodes turn out, too.

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  4. Makita is one of my good friends in Central Oregon - what a beautiful package she sent! We would travel to the Richardson Rec Ranch in Madris, Oregon and dig them up. They were so much like a quarter? per pound. A 5 gallon bucket full of them, and a few cut at a dollarish per inch, cost us $18.00 and took us all day. Great outing. I think you can google Richardson Rec or Recreation Ranch. ;)

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