Onomatopoeia:
* Crash
* Shatter
* Crack
* Smash
* Splinter
* Clink (for smaller, quieter breaks)
Descriptive words:
* A sharp, piercing sound
* A loud, resounding clang
* A series of cracking, splintering noises
* A tinkling, ringing sound
You can also combine these options to create more vivid descriptions:
* A loud crash followed by a shower of tinkling shards
* A sharp crack, then a sudden shattering of glass
Ultimately, the best way to describe the sound of breaking glass depends on the specific context and your desired effect.