what is a subconchoidal fracture? I am familiar with
conchoidal, like in obsidian or glass. Can you tell me how
Conchoidal is the most common type of fracture. It is a type of
fracture that gives smooth curved surfaces resembling a shell.
Broken glass and quartz are good examples of conchoidal
fractures. Subconchoidal is also a common type of fracture.
Similar to conchoidal, still smooth but not just as curved.
Andalusite will show this type of fracture.