| /turf/closed/mineral | Mineral deposits |
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| /turf/closed/mineral/snowmountain/do_not_chasm | Near exact same subtype as parent, just used in ruins to prevent other ruins/chasms from spawning on top of it. |
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| /turf/closed/mineral/volcanic/lava_land_surface/biome_replace | Rock type which replaces itself with whichever rock would've been generated by the biome underneath |
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| /turf/closed/mineral/ash_rock | Wall piece |
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| /turf/closed/mineral/snowmountain/icemoon/unscrapeable | This snowy mountain will never be scraped away for any reason what so ever. |
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