Crystal

Crystals are one of the items that can be collected in The Sims 4. They can be found while exploring rocks, and will provide the energized emotion.

Crystals can be sent to the Geo Council to be broken down into elements for §20. One of the possible elements that the crystal can be broken down into will arrive in the mail the following day.

In Get to Work, scientists can analyze crystals and metals themselves. In Jungle Adventure, Sims can extract elements from crystals at the archaeology table. Crystals can also be refined and later be used to make relics.

Celestial Crystal Crown
The Sims 4: Get Famous introduces the Celestial Crystal Crown. Sims can mount a crystal onto the crown while they are wearing it, which will provide a special bonus to the Sim. Rare crystals can also be used to remove a fame quirk.