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Author Topic: Similar to Sonora Dendritic jasper ???  (Read 104 times)

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55fossil

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Similar to Sonora Dendritic jasper ???
« on: October 27, 2021, 09:16:30 AM »

    Beautiful dendritic jasper. This material is super soft, almost like cutting chalk. Just wondered if this is a variety of Sonora jasper or something else. Picture of two cabochons I cut.
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irockhound

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Re: Similar to Sonora Dendritic jasper ???
« Reply #1 on: October 28, 2021, 11:25:05 AM »

Beautiful colors and material, too bad about the softness and great job working with something that soft.  Stating the obvious, but if it is that soft it wouldn't be jasper.
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peruano

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Re: Similar to Sonora Dendritic jasper ???
« Reply #2 on: October 28, 2021, 02:02:38 PM »

As in might it be a form of dendritic opal. Awfully brown to be the types of opal that I expect dendritic patterns in but . . .  what do I know.?
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R.U. Sirius

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Re: Similar to Sonora Dendritic jasper ???
« Reply #3 on: October 29, 2021, 06:42:13 AM »

It could be a form of rhyolite, or it could be common opal, but my first guess would be dolomite.

If you are comfortable handling chemicals, try a small amount of hydrochloric acid. Or dry grind on sandpaper to collect powder, then stir it into a small volume of cleaning vinegar (10%) in the bottom of a shot glass.
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55fossil

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Re: Similar to Sonora Dendritic jasper ???
« Reply #4 on: October 29, 2021, 04:13:41 PM »

    Definitely not a "jasper" as we know. It is too pretty to toss out but nothing I would buy on purpose.  Thanks for the input.
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R.U. Sirius

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Re: Similar to Sonora Dendritic jasper ???
« Reply #5 on: October 29, 2021, 04:32:21 PM »

If you have any rough left, it'd be interesting to see a picture here. Seeing a fractured surface would help us guess between opal and rhyolite or dolomite.
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55fossil

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Re: Similar to Sonora Dendritic jasper ???
« Reply #6 on: October 30, 2021, 06:14:34 AM »

Sorry, no rough or even slabs left.. that I know of.  I am just dif=gging through buckets and boxes of old material looking for the Prettys' to cut into cabs.
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