gravelgrazer
noticing nice landscape pebbles
Member since June 2012
Posts: 76
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Post by gravelgrazer on Oct 7, 2012 12:25:54 GMT -5
I polished up this limb cast I bought at an estate sale. I live in central Oregon and definately think this is a local specimen. I haven't seen one that has a center core like this. Is it selenite? Any ideas would be greatly appreciated, thanks! Attachments:
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Post by gingerkid on Oct 15, 2012 15:49:51 GMT -5
Nice limb cast, gravelgrazer, and welcome to the forum!! Not sure if it is selenite that has formed in it, but wondered if it might be opal?
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Oct 15, 2012 16:18:23 GMT -5
South Fork Limb Cast (from an area near the Crooked River southeast of Prineville). Very nice example. Chalcedony/agate interiors with green plumey areas and sometimes black dendrites.
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jason12x12
freely admits to licking rocks
Member since October 2011
Posts: 798
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Post by jason12x12 on Oct 15, 2012 20:49:41 GMT -5
nice polish on that one
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Post by gingerkid on Oct 16, 2012 11:30:30 GMT -5
South Fork Limb Cast (from an area near the Crooked River southeast of Prineville). Very nice example. Chalcedony/agate interiors with green plumey areas and sometimes black dendrites. ROFL, there you go, gravelgrazer. ;D
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gravelgrazer
noticing nice landscape pebbles
Member since June 2012
Posts: 76
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Post by gravelgrazer on Oct 18, 2012 1:36:59 GMT -5
Thanks!
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,681
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Post by Fossilman on Oct 18, 2012 15:02:08 GMT -5
Awesome Limb Cast................
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pezzottait
off to a rocking start
Member since March 2011
Posts: 23
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Post by pezzottait on Nov 13, 2012 15:36:59 GMT -5
I have a question to the word "limb cast"; I could not find it in my dictionaries. What is "limb cast" in German, please. Or can somebody give a good description.
Regards from Austria
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Nov 13, 2012 17:05:07 GMT -5
Limb casts are formed when a buried tree or shrub (trunk or branch) is buried and decays, leaving a void. Opal, agate and/or other material eventually fills this void, preserving the shape and features of the original plant material. Unlike petrified wood, a limb cast may or may not preserve internal features such as wood grain.
In my region, the limb casts are trees that were buried in volcanic material (usually ash or pyroclastic flows), which is also the source of the agate and opal that leeches into the void left by the tree.
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pezzottait
off to a rocking start
Member since March 2011
Posts: 23
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Post by pezzottait on Nov 27, 2012 15:16:30 GMT -5
Many thanks for your explanation!
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