Obsidian does have a conchoidal fracture.
Conchoidal is a type of rock fracture indicative of certain rocks and minerals.
The Answer Is Conchoidal
conchoidal
conchoidal fracturing
conchoidal or uneven
conchoidal to uneven
A minerals fracture.
conchoidal or splintery
I think it is a type of fracture
Yes
The fracture of dolomite is conchoidal