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Post by fernwood on Dec 25, 2020 6:08:50 GMT -5
If Rainforest Jasper is "technically" baby T-eggs in matrix, would amygdaloidal basalt be considered the same? Just wondering.
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Post by stephan on Dec 25, 2020 16:14:21 GMT -5
If Rainforest Jasper is "technically" baby T-eggs in matrix, would amygdaloidal basalt be considered the same? Just wondering. I believe one of the requirements to qualify as thundereggs is a rhyolite matrix. I haven’t heard of basaltic ones. Rhyolitic lava is much more silica rich than basaltic. |
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Post by 1dave on Dec 26, 2020 0:06:46 GMT -5
If Rainforest Jasper is "technically" baby T-eggs in matrix, would amygdaloidal basalt be considered the same? Just wondering. I believe one of the requirements to qualify as thundereggs is a rhyolite matrix. I haven’t heard of basaltic ones. Rhyolitic lava is much more silica rich than basaltic. Right. named for the Amygdala "Almond shaped" refers to "geodes" that began as gas bubbles in basalt or andesite. Thundereggs - Lithophysae - began as cristobalite needle spherolires in rhyolite or obsidian.  ' |
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Post by 1dave on Dec 26, 2020 11:41:39 GMT -5
I edited Wikipedia. It now reads:
"A lithophysa (plural lithophysae, from Greek lithos "stone" + physan "to blow")[1] is a felsic volcanic rock with a Spherulitic structure and interior cavity with concentric chambers. Its outer shape is spherical or lenticular. They vary in size from very small up to twelve feet in diameter depending on the age of the magma chamber. These rocks are usually found within obsidian or rhyolite lava flows. Magmas low in feldspar minerals may produce a version known as "snowflake obsidian.'[2]"
Now I'll try to add some images.
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gemfeller
Cave Dweller 
Member since June 2011
Posts: 4,067 
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Post by gemfeller on Dec 26, 2020 13:54:22 GMT -5
1dave, just for the sake of clarity, you define Amygdala as"geodes. But I've found agates with no interior cavity that formed in almond shapes in vesicular basalt. Does the term relate to a single shape of vesicle or material contained in all shapes (non-almond shapes included?) Precious opal is found in basaltic vesicles at the Whangdoodle Mine in western Idaho as well as other locations. They're not always almond-shaped. Would they be called amygdules as well or is there a more appropriate name?
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Post by 1dave on Dec 26, 2020 14:22:06 GMT -5
1dave, just for the sake of clarity, you define Amygdala as"geodes. But I've found agates with no interior cavity that formed in almond shapes in vesicular basalt. Does the term relate to a single shape of vesicle or material contained in all shapes (non-almond shapes included?) Precious opal is found in basaltic vesicles at the Whangdoodle Mine in western Idaho as well as other locations. They're not always almond-shaped. Would they be called amygdules as well or is there a more appropriate name? Not to my knowledge. Science is as Science does. They form as gas bubbles. What do gas bubbles do? Some form as teardrops, spheres, flat bottoms, collect in bunches, . . . Smooth exteriors in basalt, but as the silica content increases with melting the overhead crust rocks, basalt magma changes to andesite, becoming lumpier. The bubbles have to conform. Whoever named them was probably a man studying the brain. en.wikipedia.org/wiki/Amygdule |
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Post by 1dave on Dec 26, 2020 15:57:39 GMT -5
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Post by 1dave on Dec 26, 2020 19:48:29 GMT -5
Some thundereggs record their history.  |
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Post by 1dave on Dec 28, 2020 18:10:56 GMT -5
I crowded a lot of info into this.  |
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rockngranny
off to a rocking start
Member since August 2020
Posts: 13
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Post by rockngranny on Dec 28, 2020 18:49:40 GMT -5
I crowded a lot of info into this. |
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Post by jasoninsd on Dec 31, 2020 2:42:05 GMT -5
This was acquired from a member on the forum. I've talked with Stephan via messages and the original caretaker of this beauty...and we can't figure out what it is. So, I'm hoping Thor will send a lightening bolt down to spark a lightbulb over someone's head who might have a clue...   |
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Post by 1dave on Dec 31, 2020 6:38:22 GMT -5
This was acquired from a member on the forum. I've talked with Stephan via messages and the original caretaker of this beauty...and we can't figure out what it is. So, I'm hoping Thor will send a lightening bolt down to spark a lightbulb over someone's head who might have a clue... I would classify it as a lithophysa - a blown rock. They take many shapes depending on the elements present. excess calcite takes them one way, magnesium, sodium, potassium, etc. takes them to other shell shapes. |
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Post by fernwood on Dec 31, 2020 6:38:53 GMT -5
1dave This is a resource I am keeping. Copied and saved to my T-egg computer folder.
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Post by 1dave on Dec 31, 2020 6:42:35 GMT -5
a Mexican "Coconut" formed in magma with a lot of calcite -  Smoky Quartz -  Coconut Exteriors:  For sale at the South Entrance to the Petrified Forest in Arizona.  Treasures of the earth post:  From one of the notes the Geode Kid sent me.  |
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Post by fernwood on Dec 31, 2020 9:23:58 GMT -5
Now I am wondering.
Found what I think is a geode on my land. Was told by many that geodes or T-eggs could not be found here.
My land was at the ending of the Green Bay Lobe of the most recent glacier in WI. Also where glacial Lake Wisconsin ended. There is an old volcanic range located about 30 miles from me. The Miladore Volcanic range. The volcanic residue ended up in Lake Wisconsin. This was a huge lake in what is now Central Wisconsin.
I know what I am finding. Many have said that someone distributed many fossil and rock collections from elsewhere over 80 acres does not make sense to me. The 80 acres includes my land and that of my next door neighbor. Most of the land is wooded. I have 15 acres of agricultural land. Most of my finds have been in the ag land when it is plowed, but some along the ancient creek beds, ridges and what appears to be an ancient lake bed.
Glacial lobes and lakes can distribute many interesting things. Ancient volcanos can do the same.
I am at somewhat of a loss. Keep finding things that should not be here, according to "experts".
Would appreciate any guidance on this, as it is really frustrating to me.
Thank you.
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Post by jasoninsd on Dec 31, 2020 9:38:37 GMT -5
This was acquired from a member on the forum. I've talked with Stephan via messages and the original caretaker of this beauty...and we can't figure out what it is. So, I'm hoping Thor will send a lightening bolt down to spark a lightbulb over someone's head who might have a clue... I would classify it as a lithophysa - a blown rock. They take many shapes depending on the elements present. excess calcite takes them one way, magnesium, sodium, potassium, etc. takes them to other shell shapes. Thank you so much Dave! I figured a brighter mind would prevail!  a Mexican "Coconut" formed in magma with a lot of calcite - Smoky Quartz - Coconut Exteriors: For sale at the South Entrance to the Petrified Forest in Arizona. Treasures of the earth post: From one of the notes the Geode Kid sent me. If I'm reading all this correctly, if this is a Mexican Coconut, it's one of the more rare ones with an agatized interior rather than a geode interior. Sweet! I might not like Piña Coladas, but I'm lovin' this rock! |
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Post by stephan on Dec 31, 2020 10:44:44 GMT -5
This was acquired from a member on the forum. I've talked with Stephan via messages and the original caretaker of this beauty...and we can't figure out what it is. So, I'm hoping Thor will send a lightening bolt down to spark a lightbulb over someone's head who might have a clue... I would classify it as a lithophysa - a blown rock. They take many shapes depending on the elements present. excess calcite takes them one way, magnesium, sodium, potassium, etc. takes them to other shell shapes. OK! T-egg confirmed! Any thoughts on where it was birthed? To me the black agate screams some locations that don't match the matrix. |
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Post by woodman on Dec 31, 2020 10:45:26 GMT -5
 Richardson Rock Ranch moss bed. |
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Post by stephan on Dec 31, 2020 10:48:07 GMT -5
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Post by 1dave on Dec 31, 2020 11:53:32 GMT -5
I would classify it as a lithophysa - a blown rock. They take many shapes depending on the elements present. excess calcite takes them one way, magnesium, sodium, potassium, etc. takes them to other shell shapes. Thank you so much Dave! I figured a brighter mind would prevail! I don't think it is a coconut. Not enough calcite. I'm not sure where it came from. The iron stain seems to be where the water table usually was for a long period. |
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