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 - How do you fix massive holes that appear in the ground? - Arqade

Everything about Minecraft Java, the original blocky sandbox

minecraft java edition - How can I make it easy for a player to select a choice at a rail junction? - Arqade

How to use the fill command in Minecraft Pocket Edition

Java Edition 1.17/Development versions – Minecraft Wiki

Minecraft Is Hiding These Features In Bedrock Edition VS Java Edition

How to get my Minecraft skin back - Quora

Java Edition 20w22a – Minecraft Wiki

Java Edition 15w49a – Minecraft Wiki