Cracked Crystal

Cracked Crystal is a Crafting Material that can be used to craft the following items:

A cracked, impure, degraded, and altogether unremarkable crystal. Material used for crafting items Widely found in crystal tunnels.

Can be collected from crystal tunnels.
Can be found in Altus Tunnel
Found at Sealed Tunnel.
One can be looted off a Miner enemy on the left side of the small shack in Morne Tunnel.
Can be purchased from Twin Maiden Husks at the Roundtable Hold for 300 Runes assuming you have given the Somberstone Miner’s Bell Bearing [2].