Obsidian wands contain one or more obsidians: a large one for the wand's end cap, a small one at the wand's tip, or small ones along the wand's length.

Obsidian

Strictly speaking, obsidian is not a crystal but rather a naturally occurring volcanic glass that forms when molten lava cools too fast for large crystals to form. It is most often black, but it is sometimes brown or green.

Obsidian is hard and brittle. Obsidian therefore fractures with extremely sharp edges, which ...