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

Rock of the Earth's mantle pushed up into the crust: peridotite and serpentine. Poor, toxic soils, but chromium, nickel and talc. 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.

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What a city can dig

Building stone, Gemstones, Clay and bricks

No coal lies in this rock: a city on it burns wood, or buys its fuel.

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

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