If you use the creation spell to create gunpowder/black powder (assuming you have seen it), how long would it last? What material/materials would it fall under?
The Duration depends on the object's material. If the object is composed of multiple materials, use the shortest Duration.
- Material - Duration:
- Vegetable matter - 1 day
- Stone/crystal - 12 hours
- Precious metals - 1 hour
- Gems - 10 minutes
- Adamantine/Mithral - 1 minute
Gunpowder, or black powder,
consists of a fuel (charcoal), an oxidizer (saltpeter or niter), and a stabilizer (sulfur) to allow for a constant reaction.
- Charcoal is vegetable matter (wood); 1 day
- Saltpeter, aka potassium nitrate or nitre, is a mineral. As neither a precious metal nor a gem, it would last 12 hours
- Sulfur is also a non-precious-metal, non-gem mineral; 12 hours
The shortest duration of these three is 12 hours, so by Creation's description, their mixture would also last 12 hours