Antimony is toxic but as long as grim did not eat it, or scape it and inhale it, or sleep with it, no problem.
If allergic to cats, you'll break out in hives more so than if you pick it up for a minute and then wash your hands.
From http://www.sciencelab.com/xMSDS-Antimony-9927438:
Potential Acute Health Effects:
Very hazardous in case of ingestion. Hazardous in case of skin contact (irritant), of eye contact (irritant), of inhalation. Slightly hazardous in case of skin contact (permeator).
