Lithium is relatively rare in Earth's crust. Its abundance is estimated to be around 0.0021% by weight.

To put that in perspective:

* Silicon: The most abundant element in Earth's crust is silicon, with an abundance of 27.7%.

* Oxygen: The second most abundant element is oxygen, with an abundance of 46.6%.

* Lithium: Lithium is roughly 13,000 times less abundant than silicon and about 22,000 times less abundant than oxygen.

Despite its rarity, lithium is a crucial element for many modern technologies, including batteries, ceramics, and pharmaceuticals.