Yes
Obsidian does have a conchoidal fracture.
The fracture is conchoidal, a very useful property to stone tool makers.
The fracture of dolomite is conchoidal
This has been answered before but there was no explanation given for the curve. Materials that do not have fracture planes such as glass and obsidian (a natural glass-like mineral) do not follow any particular structural arrangement when fracturing. The curve results from the distribution of stresses radiating from the fracture start point. The fracture pattern is called conchoidal.
The Answer Is Conchoidal
conchoidal
The fracture of feldspar is conchoidal or brittle.
The fracture of feldspar is conchoidal or brittle.
Quartz does not have cleavage. However, it does have fracture. Its fracture is conchoidal.
conchoidal fracturing
conchoidal to uneven