Yeah, it's normal. You can clean it out with isopropyl alcohol, and collect the "dirty" alcohol and let it evaporate, and it should leave you with some dark crystals after the evaporation is complete and you can scrape them up. I don't know why, but I've always found them to be significantly stronger than regular crystals for some reason and they add some color to the experience. The first full blown white light encounter with the godhead I had came from smoking a marginal amount of the stuff while peaking on ayahuasca.
"Science without religion is lame. Religion without science is blind" - Albert Einstein
"The Mighty One appears, the horizon shines. Atum appears on the smell of his censing, the Sunshine- god has risen in the sky, the Mansion of the pyramidion is in joy and all its inmates are assembled, a voice calls out within the shrine, shouting reverberates around the Netherworld." - Egyptian Book of the Dead
"Man fears time, but time fears the Pyramids" - 9th century Arab proverb