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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
(first | last) View (previous 50 | next 50) (20 | 50 | 100 | 250 | 500)- Xenon (3 members)
- Xylene (3 members)
- Ytterbium (3 members)
- Yttrium (3 members)
- Zeolite (4 members)
- Ziegler-Natta (4 members)
- Zinc (7 members)
- Zinc Ingot (2 members)
- Zinc Nitrate (1 member)
- Zirconium (3 members)