"orbicular" is just a geologic term that has a similar meaning to spherical. As with most things that go unregulated by some kind of scientific body, the use with jaspers has been claimed to mean one thing by some and another to others.
Five jaspers were originally identified at the "five fine jaspers", they were bruneau, willow creek, imperial, morrisonite, and blue mountain. They were described with other terms too, they were all "porcelain jaspers" (meaning they were very fine grained) and took a "porcelain-like polish. They went on to say that to be a "fine jasper," a jasper needed to also produce the "egg-like" pattern common in each of these original five. These became (due to slang) known as orbicular jasper. Unfortunately orbicular does not limit itself to "egg-like" structures, but means any spherical or globular like structure.
The various types of orbicular rhyolites are certainly not "orbicular jaspers" as they are rhyolite, a totally different species. So there is no danger here is miss-interpreting. BUT, there are many jaspers that contain spherical structures than can easily be labeled as "orbicular", Kambamby (not kambaba) is a jasper found near the original Ocean Jasper mines, and is a fairly pure jasper with spherical structures, as are many of the true poppy jaspers.
Kambamby Jasper
Kambaba Jasper
By the way Kambaba jasper is actually a fossil material (petrified stromatolite) as is Mary Elllen Jasper.
I leave Ocean Jasper kind of by itself, but much of it is not a true jasper but more strongly related to true agate. Another miss-named material is rain forest jasper, which is another rhyolite with agate filling in the open areas.
Lilypad Jasper (another actual rhyolite)
Now we have the interesting case of a jasper that is named porcelain jasper (of course it is also called SciFi, Exotica, SanteFe, etc. etc. depending on who you ask.), and does take a porcelain-like finish and may have orbicular patterns, but does not (as far as I have seen) have the "egg-like" patterns in the "five fine jaspers."
Porcelain Jasper
Another potential claim to being a "fine jasper" is carrasite, but then it may be a first cousin of morrisonite anyway. And I have seen the "egg-like" orbs in it. Apparently from the photos earlier in the post the bat/rim jasper would be another true candidate.
So the use of the word orbicular is far more reaching and can be used with regard to jasper even if there are no "egg-like" shapes.
There are orbicular granites as well. There is also something relatively new being called "fish-eye" (I have seen both agate and jasper used with the it) that could be termed orbicular.
Fisheyes Jasper/agate
I have a couple of examples of the same type of material shown by MS SCARLETT and I still have no idea what they are. But since her post I now have a lead, and will look more closely at the bottom-back of my refrigerator!
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