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Post by MyNewHobby on Jan 25, 2009 0:45:11 GMT -5
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Post by Jack, lapidaryrough on Jan 25, 2009 1:44:58 GMT -5
I`m leaning towards Hydrated silicates,
Though the hardness is the, # 4 look like Quartz pebble.
Jack
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Post by akansan on Jan 27, 2009 13:13:00 GMT -5
If the outside is softer than the inside (the dark part), I'd guess flint/flint nodule for the inner section.  You should be able to see cell structure in bone, either agatized or not. If not agatized, there's also a possibility all you would be able to see would be the cells... |
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earthdog
Cave Dweller 
Don't eat yellow snow
Member since June 2006
Posts: 2,731
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Post by earthdog on Jan 27, 2009 22:40:36 GMT -5
Looks like those dog treats I give to the dogs every evening...
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Post by MyNewHobby on Jan 27, 2009 23:20:00 GMT -5
EarthDog .... I know .... looks like meaty snacks for dogs.
However ......... this thing is hard, as hard as a geode.
I have tried to crack or split this open and cannot.
Mind you .... I do not have all the tools I need to crack this baby open.
But .... it is very hard ....
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Post by sitnwrap on Jan 28, 2009 17:13:22 GMT -5
I wonder if it is a limbcast. My sister bought me two and they look much like yours where the outer part is white and there is a very round darker center. I'm probably all wrong but offering my :2cents: |
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Post by Jack, lapidaryrough on Jan 28, 2009 18:04:18 GMT -5
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Post by MyNewHobby on Jan 28, 2009 21:43:02 GMT -5
Lapidaryrough .......
What a gorgeous face that pooch has ....
Chow / Chow mix?
Julie
ps ... my dog is cuter than yours!
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Post by MyNewHobby on Jan 28, 2009 21:45:20 GMT -5
Sitnwrap Limbcast? ... sounds a bit macabre .... rooted in Sweeney Todd? Julie |
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Post by sitnwrap on Jan 28, 2009 22:29:39 GMT -5
lol. Not rooted in Sweeny Todd but it does or shall I say did have roots. Basically it's a petrified limb of a tree (I think) ;D
Where did you find or purchase this. Because it does look a lot like what I have but more smoothed down as if tumbled in a creek.
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Post by MyNewHobby on Jan 28, 2009 23:23:47 GMT -5
This was given to me by my neighbor from her bucket O rocks ...
Her bucket I am finding out is a treasure trove ....
Julie
I tried to break break it up with chisel and hammer ......... and No go!
Julie
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DeanW
has rocks in the head
Member since December 2007
Posts: 721
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Post by DeanW on Jan 29, 2009 10:13:13 GMT -5
A limbcast is generally a form of fossilized wood. Technically it is where a limb/root/trunk was deposited, then rotted away leaving a cavity which was later filled with agate forming a cast of wood. Typically limb casts will show definition of the bark structure but no interior cell structure whereas true fossil wood will show cell structure. This piece does not look to me like a limbcast. Although the pictures are not too clear, it also does not look like bone to me. The inner part of bone, where marrow is at, is definitely separate like your piece but not usually as large as yours appears as far as I know. Also, does the outer portion show any cell structure? Typically bone, even fossilized, will show a porous look. To me it looks more like a form of concretion. Dean |
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