dioptase /dī-opˈtās/ (mineralogy)

An emerald-green acid copper silicate

• knock together
• knock under
• knock up
• knock-up
• knock-ups
• knock wood
• knockwurst
• knockwursts
• knoll
• knolls
• knop
• knops
• knosp
• knosps
• knot
• Knotenschiefer
• knot garden
• knot gardens
• knotgrass
• knotgrasses
• knothole
• knotholes
• knotless
• knots
• knotted