Congrats to SWIY!
This is how mescaline fumarate is supposed to look like, at least according to SWIM's experience. It is very powdery material and soft like chalk (or white sand). It also weight much less that it seems. What may seem as 1 gram it can actually be 0.2-0.3 grams.
It is however no fun to snort it. SWIM did it with 125mg mescaline fumarate and yes, it does have effect, not very strong (for SWIM's taste), and he got slight visuals.
But sorting 125mg is quite a task. Whereas 150mg dmt fumarate sounds already too much, 125mg mesc-fumarate is a much bigger quantity because it is much less dense. Disgusting feeling, not burning but just uncomfortably offputting.