Multiple small, striated perfect metallic gray bournonite crystals in association with a host of other minerals
Dimensions (millimeters): 80 x 50 x 45
Dimensions (inches): 3.1 x 2 x 1.8
Well crystallized bournonite crystals are not common. Bournonite is known as "cogwheel ore" due to its twinning habit where crystals form in a rough cruciform form with pitted, deeply striated edges. Bournonite is a sulfosalt with the formula: CuPbSbS3
from Naica, Chihuahua, Mexico, mined in the 1980s
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