phoenix1647
starting to spend too much on rocks
Member since March 2013
Posts: 186
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Post by phoenix1647 on Oct 21, 2005 11:37:47 GMT -5
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chassroc
Cave Dweller 
Rocks are abundant when you have rocktumblinghobby pals
Member since January 2005
Posts: 3,586
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Post by chassroc on Oct 21, 2005 12:28:03 GMT -5
Awesome material;
My Momma always said "geodes are like a box of chocolates, you never know what you will get". I
s that a new saw in action?
csroc
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stefan
Cave Dweller
Member since January 2005
Posts: 14,113
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Post by stefan on Oct 21, 2005 12:39:35 GMT -5
Awesome!
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Post by creativeminded on Oct 21, 2005 13:29:10 GMT -5
Those are beautiful.
Tami
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Post by rockyraccoon on Oct 21, 2005 14:08:05 GMT -5
now you have to get that vibrating lap fixed! those are so cool tom!
kim
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Post by LCARS on Oct 21, 2005 14:24:44 GMT -5
neato!
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Post by Alice on Oct 21, 2005 15:18:15 GMT -5
That's great stuff!
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Post by Cher on Oct 21, 2005 16:24:58 GMT -5
I thought all geodes were hollow in the center with various types of crystals inside?? Those are sure nice looking slabs pho, what you going to do with them?
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phoenix1647
starting to spend too much on rocks
Member since March 2013
Posts: 186
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Post by phoenix1647 on Oct 21, 2005 16:53:28 GMT -5
Not sure what to do with them yet Cher...just gonna hold on to them until something slaps me up side the head.....
If they were bigger I would have tried for bookends....
Pho
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Post by krazydiamond on Oct 21, 2005 17:43:12 GMT -5
ok, i got the stupid question flag in my hand...........i thought geodes were holow inside too, like those last two photos. so what is the difference between geodes, thunder eggs and nodules (like the brazilian agate).
inquiring rockhounds need to know.
KD
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phoenix1647
starting to spend too much on rocks
Member since March 2013
Posts: 186
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Post by phoenix1647 on Oct 21, 2005 17:51:26 GMT -5
I have always thought all were the same...just a different name. Some are solid and some are hollow and some are inbetween. I think next time I am on campus I will stop in and ask the experts as Texas A and M University Geology Department.
Pho
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ArkieRockhound
freely admits to licking rocks
Member since February 2005
Posts: 870
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Post by ArkieRockhound on Oct 21, 2005 17:51:25 GMT -5
Those look great Pho. Glad you finally got your saw. We missed you in Mt. Ida last weekend.
Trish
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phoenix1647
starting to spend too much on rocks
Member since March 2013
Posts: 186
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Post by phoenix1647 on Oct 21, 2005 17:52:46 GMT -5
Sure wish I could have been there Trish....not sure when we will get another chance to go again. Got too many irons in the fire right now...looking like maybe next spring now.
PHo
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Iowahound
having dreams about rocks
Member since December 2004
Posts: 72
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Post by Iowahound on Oct 21, 2005 19:42:47 GMT -5
Geodes are named for the type of rock formation, some will be hollow and some will be solid. geodes' formation started some 300+ million years ago, in the Mississippian Age. River sediments trapped organic material in layers of mud. This organic material, released carbon dioxide and methane gas as it decayed. This gas "pooled" in the layers of compressed mud (shale), forming various-sized gas pockets. A concentrated solution of dissolved minerals invaded the pockets, creating the proper environment for crystal growth.
Just a FYI from Iowa, our state rock is the geode.
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Post by joe on Oct 22, 2005 0:20:29 GMT -5
Too cool Pho! Looks like you could be makin' a lot of wind chimes. Have fun.
joe
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Post by Cher on Oct 22, 2005 0:34:11 GMT -5
Dictionary.com says ....
geode
n : (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals
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cuervo73
starting to spend too much on rocks
Member since April 2005
Posts: 185
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Post by cuervo73 on Oct 23, 2005 17:00:51 GMT -5
Here are a pair of definitions from my Glossary of Geology:
Geode. Hollow, globular bodies, varying in size from an inch to a foot or more in size and characteristic of certain limestome beds, while rarely found in shales. Significant features are (1) subspherical shape, (2) a hollow interior, (3) a clay film between the geode wall and the enclosing limestone matrix, (4) an outer chalcedonic layer, (5) an interior drusy lining of inward projecting crystals and (6) evidence of expansion or growth. (After Pettijohn, Sed. Rocks, pp. 151-152, 1949)
Thunder egg: Geode-like body commonly containing opal, agate or chalcedony weathered out of welded tuff or lava; Brown, Smiths.Rept. 1956, 329 ; cf. lithophysa.
ed/cuervo
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Post by sandsman1 on Oct 23, 2005 22:10:32 GMT -5
if im thinkin right thunder eggs are mostly solid with Jasper or agate centers and geodes are mostly hollow with crystals but both can be hollow or solid and have a mix of things inside --- i got some from the lucky strike mine and they have both jasper and agate centers some mixed
but i could be off about this hahaha
anyway hey pho some very nice centers you got there
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