Crystal

Were you looking for:
 * Apexis Crystal (item) from Blade's Edge Mountains?
 * Arcane Crystal used for crafting, especially transmuting Arcanite?
 * Crystals for enchanting?
 * Jagged Blue Crystal and Jagged Red Crystal for making a Cache of the Legion Key?
 * Power crystals from Un'Goro Crater?
 * Resulting consumables: Crystal Charge, Crystal Force, Crystal Restore, Crystal Spire, Crystal Ward, or Crystal Yield.
 * The Qiraji resonating crystals that summon Qiraji battle tank mounts?
 * Shadow Crystal or Sun Crystal for jewelcrafting?
 * Consumable items: Crystal of Ferocity, Crystal of Insight, Crystal of Vitality, Mystic Crystal, Sanctified Crystal, or Violet Scrying Crystal?
 * Junk items: Crystal Fragments, Runic Crystal, or Strange Crystal?
 * Off-hand items: Abjurer's Crystal, Coldarra Crystal, Consortium Crystal, Divining Crystal, Ice Crystal, Imbued Draenethyst Crystal, or Umbral Crystal?
 * Quest items: Ara Access Crystal, Arklon Crystal Artifact, Astromancer's Crystal, Ata'mal Crystal, Attuned Crystal Cores, Axxarien Crystal Sample, B'naar Access Crystal, Banishing Crystal, Blight Crystal, Charged Vekh'nir Crystal, Corrupted Crystal, Coruu Access Crystal, Cracked Necrotic Crystal, Crimson Crystal Shard, Crystal of Deep Shadows, Crystal of Unstable Energy, Crystal of Zin-Malor, Crystal of the Frozen Grip, Crystal of the Violent Storm, Dormant Polished Crystal, Draenethyst Crystal, Draenethyst Mine Crystal, Duro Access Crystal, Earth Crystal, Enchanted Nethervine Crystal, Enchanted Resonite Crystal, Energized Polished Crystal, Engine-Core Crystal, Etherlithium Matrix Crystal, Faint Necrotic Crystal, Faintly Glowing Crystal, Flawless Crystal Shard, Glowing Sanctified Crystal, Harvested Blight Crystal, Impact Site Crystal Sample, Infused Crystal, Infused Vekh'nir Crystal, Inoculating Crystal, Irradiated Crystal Shard, Jaloot's Favorite Crystal, Ley Line Attunement Crystal, Mo'grosh Crystal, Nethervine Crystal, Oracle Crystal, Oshu'gun Crystal Fragment, Resonite Crystal, Sin'dorei Scrying Crystal, Singing Blue Crystal, Singing Crystal Shard, Skyreach Crystal Cluster, Skyreach Crystal Clusters, Storm Crystal, Survey Data Crystal, Tainted Crystal, Tumbled Crystal, Unstable Mana Crystal, Vekh'nir Crystal, or Zeppit's Crystal
 * Trinkets: Hibernation Crystal, Natural Alignment Crystal, or Timbal's Focusing Crystal?