minecraft java edition - Why can't I mine this block? - Arqade

I've hammered away at the ore block in this screenshot (which I believe is diamond) but I can't break it. I've tried other tools but none have any effect. Can anyone suggest what I'm doing wrong?

minecraft java edition minecraft redstone - What is the actual spread speed of water and lava in the context of a stone generator? - Arqade

What triggers the Cannot Mine path in the Mine logic block? : r/Desynced

minecraft java edition - What is the easiest and fastest way to spawn ghasts on the Nether roof? - Arqade

minecraft java edition mods - Moonstone Ore turns into invalid item when mined - Arqade

minecraft java edition - What kind of wood block is at block 0 0 0? - Arqade

HOW TO ANDROMEDA BRIDGE (FASTEST BRIDGING METHOD), Minecraft Java 1.18

Strongholds still limited to only 3 per world : r/Minecraft

minecraft java edition minecraft commands - How do I create unbreakable blocks? - Arqade

minecraft java edition technical issues - Blocks aren't showing - Arqade

minecraft java edition - Could two packs spawn in the exact same block within seconds? - Arqade