paragenesis /par-ə-jenˈi-sis/ or paragenesia /par-ə-jin-ēˈzi-ə/ (geology)

1. The order in which minerals have developed in a given mass of rock
2. The development of minerals in such close contact that their formation is affected and they become a joined mass

paragenetˈic adjective

• headshake
• headshakes
• headsheets
• headship
• headships
• headshot
• headshots
• headshrinker
• headshrinkers
• headsman
• headsmen
• heads of state
• headsquare
• headsquares
• headstall
• headstalls
• head start
• head starts
• head-station
• head-stations
• headstick
• headsticks
• headstock
• headstocks
• headstone