|image=FileXen turret brush.jpg|150px
|rate of fire=Slow to fast
|counterpart=Other CategorySentry weapons|sentry weapons
'''Violet Crystals''',''Half-Life Prima Guide'' also known as '''Flowers''',env_laser's entity name are hostile alien organisms featured in ''Half-Life''.
Violet Crystals are stationary alien organisms seen in the alien world Xen. They consist of a triangular purple body attached to a stem from the ceiling. When the player is nearby, they act like a gun turret and fire purple laser beams at the player. They don't pose as big of a threat as other alien creatures. The player is able to destroy them, or simply avoid them. When destroyed, they explode in a blast of purple smoke and leave flesh gibs behind.
Violet Crystals only appear in the floating island featured in the chapter ''Xen (chapter)|Xen''. There are only four present in the entire game.
==Behind the scenes==
Violet Crystals are made out of http//developer.valvesoftware.com/wiki/Brush brush based entities, including a func_tanklaser tied to an env_laser, which fires laser beams, and a func_breakable as its body. When the body is destroyed, it disables the beams. The laser is configured to shoot at the player only and ignores everything else.
FileXen turret fire1.jpg|Firing at the player.
FileXen turret fire2.jpg|Ditto.
==List of appearances==
CategoryHalf-LifeCategoryXen weaponsCategoryWeaponsCategoryXen sentry weaponsCategoryXen flora and mineralsCategoryBrush entities