when did deepslate get added to minecraft

Deepslate was added to Minecraft in the Caves & Cliffs era and became part of the game in the 1.17 update. Mojang also highlighted it in a “Block of the Week” post in May 2022, describing it as a relatively new block first shown during Minecraft Live 2020.

Quick Scoop

• First shown: Minecraft Live 2020.

• Added to the game: Minecraft 1.17 / Caves & Cliffs Part 1.

• Official spotlight: May 18, 2022 in Mojang’s block feature article.

Extra context

Deepslate appears deep underground and replaces stone in the lower layers of the Overworld, which is why players usually notice it when mining far below the surface. If you meant the reinforced deepslate variant, that was tied to the Wild Update and began spawning in June 2022.

TL;DR: Deepslate landed with Minecraft 1.17, released in 2021.