Alan

That is a Pelt pattern.

Pelt with an air bubble pop.

Impact damage.

I've never understood that agate makers specifically chose raw agate with much specificity beyond fissure-free to avoid fracturing during grinding.

x2

What do you mean by "type"?

It is an agate (not glass).

Its just a cold shear on a machine made. It looks more like modern glass, lacking any other identifying traits.

I too have not heard of a "Green Jewel".

You have it in hand and I don't, but trace the seam gap around. A flopover ingot happens when the single glass ingot is sheared and folds over on itself as it enters the rollers. Not an uncommon occurrence.

That looks like Pelt glass to me.

Looks like a flopover single ingot. Not a Moonie. The seam doesn't appear to go completely around the circumference of the marble.

I thought that I would continue my earlier thoughts on Jabo with a focus on investor runs after a fairly long discussion with a person who was a regular on the Tribute runs and reasonably knowledgeable about the Joker runs. Bear with my train of writing because the conversation was far-ranging and I kept tugging it back to the OP's original point and my notes follow that conversation serpentine flow. The basic characteristic of the Joker runs was that the investors had specific ideas of what they wanted the result to (roughly) look like and they specified that to Dave M. The ran a black aventurine experiment that went well. "They did their own thing". Some use of dark colors made the run go somewhat dark with results being satisfactory and some less so. The Tribute runs were different. The investors gave Dave M. leeway to choose glass. Dave started with showing color samples with two prior visits with some of the investors well before the run. The discussions in total took up many hours. (Most of those discussion have been recorded and I am trying to get access to those to transcribe them. They are already partially transcribed and I understand that the editing is very slow and, very time-consuming (even automated)). All of those discussion were about glass, glass choices, glass color palette (color wheel) and I understand that drawings exist from those discussions. Also, tank rebuild process photos. The Tribute runs chose (in some cases) a white base glass of Fenton "Hobnail White". Some of the in-the-moment choices for glass by investor individuals were added. The red glass was "fussy" and could easily be problematic ("It does what it wants to"). Sometimes they had to change the red out. (MK sometimes had problems with that red glass and the problem was not easily corrected despite considerable time, effort and consultation with other glass makers). The Tribute run used roughly $10-20,000. of glass in a 24 hour period. There was a lot of breakage in the Tribute runs. That breakage was trash. To your question of consistency in the run and the ability to ID: If the run kept the same base glass, the progression in the run can be seen if you look at a large enough sample set. Hope this builds insight. Alan

I don't see the definitive clear (of which there should be quite a lot) and the whispy white.

Most vintage marble manufacturers had product lines. Those product lines were documented in sales brochures for retailers to order from. They were also represented in Salesman's Boxes that were used for retailers to see and order from. Retailers knew what sold and what they wanted to offer buyers. Manufacturer production aligned with orders (mostly). Jabo and SMM didn't run that way. Lets focus on Jabo investor runs, since they are what you likely have most of. Investor runs. Those run participants decided what dollar amount they wanted to spend on glass and in most cases, what "experiments" they wanted to do (usually more costly glass additives). Of all conversations I have had, I don't know of investor run intentions of producing marbles of a specific appearance, although goals of oxblood, transparent colors etc existed and glass was ordered by Dave M. to that preference. Keep in mind that dialing in the glass pot to specific intended colors at the rollers is a tricky thing subject to several variables, weather and glass pot age and condition not being the least of them. Dave M was a skilled and experienced guy to make those adjustments based on what he was seeing. I consider variation in an investor run to be the norm. I've never heard it said that they wanted or expected to get consistency in the multi-day run. Variation was a plus. I'll note that there is a term that was used at the time of Jabo investor production known as a "tank wash". While the concept is real in the business, the reason for its use in investor run really has nothing to do with clearing a glass pot for a new batch. Shifting: Jabo "Classics" (5/8") pre-dated investor runs IIRC. See this link for more on the valued work that Michael Warnelis did for the hobby piecing together like Classics into incredible and well-priced Jabo Classics boxes. Thank you Mike. https://marbleconnection.com/topic/23863-michael-warnelis/ Jabo investor runs represented a first opportunity for collectors to have a hand in making marble towards their appearance goals. I'll defer to others that may want to post details on SMM. I say: "Collect what you like". I wouldn't think too much about whether marbles from a 24-hour run are consistent. They won't be. But the variation is their strength, not their weakness. It may make us research more, look at the glass more closely and think about the diversity. Those are good things.

Don't think of a glass pot as a perfect, singular and constant source. Marble making was/is an incredibly cheap, mass production process. Variations always occur.

Annealing fractures in each photo. I'd walk away.

Mica can be found in small (and occasionally, large) flakes embedded in minerals. Large flakes in other minerals are hard to find, at least where I hike. More often, its found in flat, relatively thin multi-layered flakes. Most often silvery, its uncommonly found (by me) in dark, almost black form. Due to its very thin layers, it is usually fragile when found alone. Mica in thin layers:

That isn't mica. Mica comes in very thin sheets, most often layered. Sometime silvery, sometime nearly black (which wouldn't be used in marbles). I have quite a lot of it from hiking in the mountains. I'll take pics for you tomorrow in the sun.

Yes

I'm referring to commercial batch product. Like Spruce Pine. If anyone has evidence to the contrary, I'm ready to learn.

A "Chalkie" is just marbles run with slaggy scum in the glass. A batch defect that would normally have been corrected. Somehow folks started to think they were a type of their own at some point. I see your point about the reflection. I'd like to see it with less light at the termination point, if possible. I *think* it might be something older (or not).

Thats oven brick particles. It can't be batch, because vintage makers didn't use batch. Mica looks quite different.

Not Akro for me.