What color is Obelisk (Netherlands) ?

Source Crayola® CSS3 CSS4
#9294a5
 
#979aaa
manatee
#a9a9a9
dark gray
#a9a9a9
darkgrey
#535a7f
 
#4a646c
deep space sparkle
#483d8b
dark slate blue
#483d8b
darkslateblue