Words to Describe allotrope

How allotrope often is described ("________ allotrope")

• third
• gaseous
• red
• triatomic
• solid
• white
• temperature
• only
• common
• black
• yellow
• particular
• metallic
• second
• gray
• stable
• cubic
• unstable
• new
• monoclinic
• grey
• crystalline
• amorphous