Java Edition 21w07a

21w07a is the tenth snapshot for Java Edition 1.17, released on February 17, 2021, which adds Grimstone and tweaks ore and cave generation.

Blocks

 * Grimstone
 * A new type of stone.
 * Generates below y = 0.
 * Functions identical to cobblestone and blackstone in that grimstone can be used to craft basic tools, furnaces and brewing stands.
 * Can be used as a decorative block.
 * It can be crafted into many different variants.
 * Has a hardness value greater than that of stone but can be mined with any pickaxe.

General

 * Data Packs
 * Added to.

Blocks

 * Blackstone, polished blackstone bricks, and cracked polished blackstone bricks
 * Slightly changed the texture.


 * Ores
 * The textures of coal ore, diamond ore, gold ore, iron ore, and redstone ore have been changed. All ores except diamond had the shape of the "ore pattern" in the stone changed to make them visually distinct.

World Generation

 * Caves
 * Noise caves and aquifers appear less often.


 * Mineral distribution
 * Changed ore generation of all ores making them have a spread value like lapis lazuli ore. Some still retain a linear generation alongside a spread generation.
 * Coal ore, emerald ore, and copper ore no longer generate below y = 0.
 * Copper ore generates between the altitudes of 0 - 96 and like all other ores, uses spread. It peaks at y = 48.
 * Emerald ore generates between y = 32 - 480 as a spread, peaking at y = 256 and decreasing in quantity as the altitude decreases.
 * Coal ore attempts to generate twice: once, evenly between an altitude of y = 136 - 256; and as a spread, peaking at an altitude of 96 and generating between an altitude of y = 0 - 192.
 * Other ores also generate differently.
 * Iron ore attempts to generate twice: once as a spread peaking at an altitude of y = 256, generating between y = 128 - 384; and another as a spread peaking at y = 32 and generating with a minimum height of -16 and a maximum height of 80.
 * Gold ore generates between the altitudes of y = -64 - 32, peaking at y = -16. The extra gold that generates in the badlands biome is untouched.
 * Lapis lazuli ore attempts to generate twice: once, as a spread between the altitudes of y = 32 - -32, peaking at an altitude of 0; and evenly between an altitude of y = 64 - -64, generating buried like ancient debris.
 * Redstone ore attempts to generate twice: once, evenly between an altitude of y = 15 - -64; and as a spread, peaking at an altitude of -64 and generating between an altitude of y = -32 - -96.
 * Diamond ore now generate as a spread, generating below y = 16 and becoming more common at lower depths.
 * Tweaked size and positioning of diorite, andesite & granite generation.
 * Pockets of diorite, granite and andesite are now larger but less common.
 * Diorite, granite, and dirt no longer generate below y = 0
 * Grimstone now generates as the dominant stone below y = 0.
 * Andesite still generates unlike stone, diorite, granite, and dirt.


 * Mineshafts
 * Corridors are now supported by chains above.
 * Wood pillars are now made of logs instead of barks.


 * Strongholds
 * Are now encased in stone.

General

 * Creative inventory
 * The Redstone Tab has been reordered to prioritize highly-used blocks
 * Redstone items/blocks have been grouped and ordered in the following way: Essentials, Unique activators, Miscellaneous, Common activators, Openables


 * Tags
 * Added grimstone to the block tag and the  item tags.
 * Added various grimstone variants to the block and item tags.

Video
Video made by slicedlime