Words to Describe chalks

How chalks often is described ("________ chalks")

• upper
• argillaceous
• blackboard
• red
• fractured
• powdered
• dense
• prepared
• colored
• white
• coloured
• softest
• nodular
• hard
• porous
• pink
• turonian
• harder
• allochthonous
• natural
• fluorescent
• danian
• massive
• few
• black
• pastel
• yellow
• clayey
• pale
• gigantic
• pelagic
• gray
• pointed
• tinted
• cenomanian
• marine
• delicate
• thick
• one
• promiscuous
• thin
• marly
• calcareous
• softer
• glauconitic
• long
• fabricated
• sea
• lacustrine
• siliceous
• lithographic
• bright
• phosphatic
• porosity
• pure
• different
• cretaceous
• magnesian
• french
• grey
• soft