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Author Topic: Chert?  (Read 2323 times)

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Sifu

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Chert?
« on: May 12, 2016, 12:45:56 PM »
Frost heaved out of the ground in Eastern Oregon. Fracture pattern reminds me of chert, but it doesn't seem as silicaceous (is that a word?) as other chert I've seen west of the Cascades.
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lithicbeads

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Re: Chert?
« Reply #1 on: May 12, 2016, 12:50:24 PM »
I would say yes but  maybe it fits best in the sub category of flint. These are subjective categories to a degree. I have seen and cut low grade Biggs that looks like that and is low silica and Biggs is a chert, sedimentary jasper.
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Sifu

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Re: Chert?
« Reply #2 on: May 12, 2016, 12:56:13 PM »
Here is a photo of a different one. I get that flint and chert are like two flavors of vanilla ice cream - maybe one is French vanilla and the other is vanilla bean? I will mess around with cutting and polishing this stuff and see what happens. Appreciate the added perspective - thanks.
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