chunk of jasper ?

[rockette]

found in Arkansas...

 

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[Eu_citzen]

Well, it sure looks like chalcedony. Jasper is opaque, I doubt this one is.

 

[jackiedanger]

Petrified wood...?

 

[rockette]

thanks for replies - a friend suggested the jasper, but she knows less than I do lol

 

[StoneWhisper]

Very thick/dense brownish red agate.. wonder sample for clean, crisp facets and cabochons..

 

[gunsil]

Like EU says, chalcedony. Translucent chalcedony is agate, opaque chalcedony is jasper. Yours looks like it might be nice sliced up, and made into slabs or cabochons.

 

[DDancer]

Looks more like a fine grained quartz specimen. Fracture patterns and the sandy appearance lend to that belief. It almost has the appearance of an agate like material. As suggested if you cut stones I feel it would make some nice polished material Good Jaspers will have a glassy appearance and fracture much like glass.

 

[Eu_citzen]

For anyone that wants a good read on quartz:
The Quartz Page

Agate is mostly just defined as banded chalcedony.

 

[DDancer]

Mostly just defined?.... quartz derived materials are essentially graded and sorted by their name. Its kind of important to know that name as it implies the character of the material to other people. That character also helps to define how, where and what may have formed the material. Just calling agate a banded Chalcedony may be correct however there are several variations and those variations can occur in very different geologies.