They would be freebase DMT crystals most likely.
The pKa of DMT is 8.68. At that pH it’s 50% freebase, and 50% salt.
Freebase is what you get when you basify DMT with lye, lime, soda ash, etc. If the last step in the extraction has a high pH, you have freebase DMT. Basically taking the pH 2 points above 8.68 makes DMT a free molecule, unpaired with anything else. It’s just DMT.
DMT fumarate, or DMT acetate, are DMT paried with an acid. When DMT is mixed with an acid at a pH 2 points below 8.68, it pairs with it forming a salt. So if the last step in your extraction has a pH of 6 or so, then you have DMT as a salt, such as DMT fumarate, or DMT acetate, depending on the acid you added.