Bournonite crystals belong to the orthorhombic form of short columnar and plate, brittle, with metallic luster, often Chenggang grey to dark grey.
车轮矿晶体，属斜方晶系，呈短柱状和板状，性脆，具有金属光泽，常呈钢灰色至暗铅灰色。
2
Ductile and brittle materials behave differently in compression test as well. The compression test is conducted on short cylindrical specimens placed between parallel plates.
塑性和脆性材料在压缩试验中表现的特性是不相同的。压缩试验是把短圆柱形试件放在两平行平板之间进行的。
3
Short columns can induced brittle failure, strengthen it with additional stirrups, which shearing capacity can meet the seismic requirements.