conchoidal ( synonym found)
Definition of conchoidal:

°Describing a type of irregular fracture that occurs in materials with no natural plane of separation, such as flint.
°(of the fracture of minerals and rocks) having smooth shell-shaped convex and concave surfaces.
Definition of conchoidal:

°Describing a type of irregular fracture that occurs in materials with no natural plane of separation, such as flint.
°(of the fracture of minerals and rocks) having smooth shell-shaped convex and concave surfaces.
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