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Author Topic: Orbicular, oolitic or pisolitic??  (Read 141 times)

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AgateLicker

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Orbicular, oolitic or pisolitic??
« on: March 25, 2019, 10:50:44 AM »

Self-collected a few miles away. Site is near in-situ location but majority picked within immediate vicinity of Sinaguan ruins. Probably cast-off from tool making as majority is run through with quartz or calcite veins, fractures and inconsistencies that would make knapping a nightmare. High quality material with a nice, subtle pattern. Most is cloudy but about 10% has this orbicular-esque deal going on.

What would YOU classify it as?
P.S. Someday I'll figure out this image hosting game. In the mean time, sorry for the thumbnails.





A bonus pic of a sweet quartz finger in some seriously fractured stuff.

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irockhound

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Re: Orbicular, oolitic or pisolitic??
« Reply #1 on: March 25, 2019, 12:11:06 PM »

The material I have collected or bought that has had the Oolitic or Orbicular tags has always been circular or close to it and somewhat consistent in the shapes in that they don't vary that far from the circular.  In the pieces you have the patterns are mostly circular on one piece and some nothing near close to circular on another mixed with a couple circles so I am not sure what to call it.  Maybe "speckled" Lol.

Okay I looked up the definitions.  I am not sure your inclusions are Ooides, really that is the def. of Oolite is having Oolides.   Orbicular definitely says circular inclusions and because they are not .  I think I would still think out of the box it would be Oolitic since Oolitic can also be in chert form.     I don't know if there has ever been a classification that had limits to the term.  How cracked and healed does a piece have to be to warrant "Brecciated".
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AgateLicker

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Re: Orbicular, oolitic or pisolitic??
« Reply #2 on: March 25, 2019, 02:20:35 PM »

Irockhound, I will attempt a crisper shot of the consistent one. It appears to have definite centers to each speckle and as you've stated, majority of oolitic out there tends to be largely ovoid or circular with a smaller margin for abnormal shapes, as this piece does.

The assortment of variations between the two examples pictured runs the gamut. I'll exhume the bucket and see what I can scratch up in regards to intermediate chunks.

I appreciate your input as I'm stumped.
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rocks2dust

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Re: Orbicular, oolitic or pisolitic??
« Reply #3 on: March 25, 2019, 02:22:13 PM »

Looks oolitic to me, too. At least some of the dots seem to have cores, and oolites build up in shallow lakes or seas from whatever starter piece rolling around and accumulating an outer shell. Hope you find slices thick enough to cab or carve - should be very attractive.
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r2d

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AgateLicker

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Re: Orbicular, oolitic or pisolitic??
« Reply #4 on: March 25, 2019, 02:49:50 PM »

Thanks,  rocks2dust. I'm looking forward to seeing it cut as well. Will share post-op photos,  for sure. Not enough light gets shed on less fancy Jaspers and I'd like to change that.
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