It’s a geode. You can sess that, the way the rock around…

““It’s a geode. You can sess that, the way the rock around you abruptly changes to something else. The pebble in the stream, the warp in the weft; countless aeons ago a bubble formed in a flow of molten mineral within Father Earth. Within that pocket, nurtured by incomprehensible pressures and bathed in water and fire, crystals grew. This one’s the size of a city. Which is probably why someone built a city in this one. You stand before a vast, vaulted cavern that is full of glowing crystal shafts the size of tree trunks. Big tree trunks. Or buildings. Big buildings. They jut forth from the walls in an utterly haphazard jumble: different lengths, different circumferences, some white and translucent and a few smoky or tinged with purple. Some are stubby, their pointed tips ending only a few feet away from the walls that grew them—but many stretch from one side of the vast cavern into the indistinct distance. They form struts and roads too steep to climb, going in directions that make no sense. It is as if someone found an architect, made her build a city out of the most beautiful materials available, then threw all those buildings into a box and jumbled them up for laughs. And they’re definitely living in it. As you stare, you notice narrow rope bridges and wooden platforms everywhere. There are dangling lines strung with electric lanterns, ropes and pulleys carrying small lifts from one platform to another. In the distance a man walks down a wooden stairway built around a titanic slanted column of white; two children play on the ground far below, in between stubby crystals the size of houses. Actually, some of the crystals are houses. They have holes cut in them—doors and windows. You can see people moving around inside some of them. Smoke curls from chimney holes cut in pointed crystal tips.””

— N.K. Jemisin