Black Chalk like nasal mucous

Over the past few weeks I have had black chalk like nasal mucous, I am not a smoker, and never have been, I also stay as far away from smokers as possible. I am not sick, no cough or congestion, just black mucous, and it's not dried blood, it looks like I rubbed charcoal up my nose, it even stains my skin a bit, does anyone have any idea what this could possibly be?
Thanks

[National Jewish Health]

This is most unusual.  The most likely cause is the inhalation of an irritant, which has black particles.  It would be wise to make a careful review of all recent occupational and home exposures.  Black mold has been described as a cause of infection and lung damage in infants, but I could find no reports of it causing nasal symptoms in adults.

My suggestion would be to have this black mucous examined microscopically and cultured for fungi.