Obsidian ____________.
A) is volcanic glass
B) possesses conchoidal fracture
C) typically is felsic in composition
D) all of the above

Question

Quizplus · Accepted Answer

Obsidian is a volcanic glass that possesses conchoidal fracture, meaning that it breaks in smooth, curved surfaces that resemble the shape of a clamshell. It can have a variety of compositions, but it typically contains high amounts of silicon and oxygen, making it felsic in nature. Therefore, all of the given choices are correct.