OP says thin long crystals = n-iso, and small crusty ones = good stuff
it looks to me like long thin crystals with some small crusty ones hanging around the edges. Hoping I'm wrong here because if thats all the meth around the corners, this shits cut like the dickens.
heres pics
black surface https://anonimage.net/db/full/Vml7ZT605D.png
glass surface https://anonimage.net/db/full/RueE0vfBtv.png
mason lid and plastic surface https://anonimage.net/db/full/GVXW3oM58x.png
crystal on a plate https://anonimage.net/db/full/IHRkOXKbqC.png
Edit: that is not a dinner plate btw. tiny plate
Edit 2: Wait a minute. That's not a plate at all. That's the other side of the mason jar lid. Good lord
Dude to be honest, no one seems to definitively know shit about meth crystallization—or there are no hard and fast rules that will tell you. I say this after asking a rather straightforward question anoit crystalization of d-meth vs racemic. Take a look at how the /r/drugnerds crowd was pretty much unable to answer a rather basic question (for a sub about drug science) relating to the chemistry of a pretty well researched drug like meth:
https://www.reddit.com/r/DrugNerds/comments/7k41vi/clarification_requested_re_crystal_methamphetamine
Edit: My point is that it seems like everyone on the internet has enough info to know how to make meth, but good luck finding someone who understands the chemistry of cutting it and is willing to talk about it. I mean, it seems like actual researchers can’t even agree on what is/isn’t possible. So don’t expect such simple tests to provide anything definitive.