Ultramafic rock (peridotite, serpentinite): minerals, ores and what a city can dig

Under a city, Ultramafic rock (peridotite, serpentinite) holds 28 minerals of the Crystal encyclopedia and the ores of no metal worked before the industrial age.

What a city can dig

Building stone, Gemstones, Clay and bricks

Minerals

Diamond, Garnet, Jade, Peridot, Spinel, Talc, Serpentine, Demantoid, Enstatite, Joaquinite, Neptunite, Pectolite, Pentlandite, Olivine, Tremolite, Uvarovite, Chromite, Benitoite, Nephrite, Garnierite, Nickeline, Heterogenite, Magnesite, Platinum, Cooperite, Osmiridium, Osmium, Iridium

Orders of magnitude for play: sourced figures and Hearth estimates together. Every source, and every figure still waiting for one, is listed in the builder under Sources.

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