Jet is a non-economic dark gray stone found in large clusters in sedimentary layers. It is not magma safe, and may only be used where any other stone would suffice, aside from one remarkable property.
Jet is the most lightweight stone besides raw adamantine and lignite, so it is preferable for making large pots and other commonly-hauled items, and absolutely inappropriate for stone-fall traps and catapults. Likewise, jet crafts are even more lightweight than normal crafts; this can be very helpful for maximizing caravan output.
In real life, jet is actually derived from decaying wood under extreme pressure and is an extremely low grade of lignite. However, jet is useless as a fuel, although historically it has been a popular source of jewelry and crafts.
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Jet is not to be mistaken with Fallout lore. Melting this rock in magma and trying to inhale the vapors will not make your dwarves behave differently. Even with furious testing with multiple dwarves they acted no differently to repeated dump jet tasks; and thus the only reasonable explanation is that melted jet is not intoxicating nor does it produce an addiction. Although I might need to add that some dwarves had much Fun with magma, I assume this was due to carelessness rather than intoxication. More research is needed.
[INORGANIC:JET] [USE_MATERIAL_TEMPLATE:STONE_TEMPLATE] [STATE_NAME_ADJ:ALL_SOLID:jet][DISPLAY_COLOR:0:7:1][TILE:176] [ENVIRONMENT:SEDIMENTARY:CLUSTER:100] [IS_STONE] [SOLID_DENSITY:1320]