<P> Conchoidal fracture describes the way that brittle materials break or fracture when they do not follow any natural planes of separation . Materials that break in this way include quartz , flint , quartzite , jasper , and other fine - grained or amorphous materials with a composition of pure silica , such as obsidian and window glass . </P>
<P> Conchoidal fracture describes the way that brittle materials break or fracture when they do not follow any natural planes of separation . Materials that break in this way include quartz , flint , quartzite , jasper , and other fine - grained or amorphous materials with a composition of pure silica , such as obsidian and window glass . </P>
made out of brittle breaking rock materials such as flint chert and obsidian
made out of brittle breaking rock materials such as flint chert and obsidian
Conchoidal fracture
Conchoidal fracture