Colorless prismatic crystals to about 0.75mm in Cuprobismutite with some Quartz. Cannonite is a rare mineral that can be found as an alteration product in copper-bismuth-gold sulfide deposits. The type locality is at the Tunnel Extension No. 1, Marysvale, Piute Co., Utah.
Cannonite is named in honor of the late "Bart" Cannon V (1950-2019), mineral collector and microprobe operator. The microprobe was in his basement along with many other analytical machines.