Aventurine Compatability

[Bradley Howes]

Hello All,

My friend has been developing an aventurine recipe and has been getting some pretty good results. Not as good as some that I've seen from Dino Rosin but better than commercial aventurine. I've now got a cracked crucible who's days are numbered. When its time to kill it, I plan to fill it with aventurine batch with my friend. Before we commit to that however, I'd like to run a compatibility test to see if it's compatible with regular studio glass. Is there a test you guys would recommend doing? I'm mostly familiar with stringer tests and cylinder tests, one glass cased around the other and a section is scored to see how it expands or contracts. There's a possibility we could get access to a dilatometer and run some tests but I don't know how accurate that would be with the aventurine. Any insight or direction would be greatly appreciated!

[Pete VanderLaan]

Us the tests in Glassnotes IV. The ring and the Hagy seal are the reliable ones.
Do take note of the work Dan Schoewer did at Bullseye regarding the importance of viscosity.

Dilatometry will tell you what a glass expansion is at that moment. It's a moving target to a great extent. I find it useful when I know absolutely nothing about a glass but if I want to make things, I rely on the ring test.

[Josh Bernbaum]

This has me wondering if you can even get accurate results for the test until you go through that process of letting the avventurine cool to room temp in the pot first. Then reheating chunks and testing.

[Pete VanderLaan]

As I suggested: "A moving target."

[Tom Fuhrman]

I'm curious, is there a big difference between creating aventurine with chrome and copper? I've used lots of rolled sheet green aventurine made with chrome but the gold aventurine seems to be a totally different animal. Why does thew viscosity of these 2 "animals" seem to be so so different? Is the green a true aventurine or does it have a different classification? I've also used some blue aventurine that always gave me compatibility problems.

[Pete VanderLaan]

I think the odd ones are really done with Micah.

Chrome is far easier to make compared to copper aventurines