Words to Describe magnetites

How magnetites often is described ("________ magnetites")

• certain
• mixed
• many
• bacterial
• scandinavian
• swedish
• canadian
• higher
• normal
• natural
• titaniferous
• synthetic
• artificial
• eastern
• american
• bearing
• stress
• granulite
• micron
• siliceous
• doubtful
• pure
• rich
• impure