Volcanic rock: minerals, ores and what a city can dig

Lava and ash cooled at or near the surface: basalt flows, tuff and pumice. Weathered, they make some of the richest soils. Under a city, Volcanic rock holds 52 minerals of the Crystal encyclopedia and the ores of iron, copper, mercury.

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Metals and their ores

• Iron from Magnetite
• Copper from Copper, Chalcopyrite, Bornite
• Mercury from Cinnabar

What a city can dig

Iron, Copper and bronze, Building stone, Gemstones, Clay and bricks, Sulphur

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

Minerals

Amethyst, Ruby, Sapphire, Obsidian, Magnetite, Copper, Topaz, Opal, Labradorite, Peridot, Spinel, Carnelian, Chalcopyrite, Sulfur, Sodalite, Chalcedony, Prehnite, Chlorite, Spessartine, Larimar, Sunstone, Bloodstone, Cinnabar, Pyrrhotite, Stilbite, Apophyllite, Analcime, Enstatite, Hauyne, Heulandite, Joaquinite, Natrolite, Nepheline, Neptunite, Pectolite, Pentlandite, Olivine, Diopside, Ilmenite, Realgar, Orpiment, Agate, Onyx, Jasper, Orthoclase, Bornite, Gibbsite, Nickeline, Manganite, Sperrylite, Cooperite, Bauxite

Offered first on: plateau, island, volcanic field

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