Crystal Geode

From Doom Wiki

Crystal Geodes are the large ammo type used to power Heretic's Elven Wand. They are not as common as Wand Crystals, and provide the player with 50 shots (75 on skills 1 and 5).

Heretic ammo
Wand Crystal	Ethereal Arrows	Claw Orb	Lesser Runes	Flame Orb	Mace Spheres
Crystal Geode	Quiver of Ethereal Arrows	Energy Orb	Greater Runes	Inferno Orb	Pile of Mace Spheres