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 - Loaded chunk visibly disappears when in one chunk but appears in the next? - Arqade

Your forum name as a seed - Seeds - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum

The hidden block! - Discussion - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum

Mined blocks aren't dropping anything. Is this server lag, or something else? : r/Minecraft

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

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

Why is my Minecraft display cut to a corner when I use Optifine? - Quora

Is there a way to replace all blocks in a world? (1.12) - Recent Updates and Snapshots - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum

minecraft java edition - My End Portal isn't working - Arqade

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

I need some help. - Discussion - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum

Java Edition 21w13a – Minecraft Wiki

Java Edition 15w14a – Minecraft Wiki

Java Edition 1.15 – Minecraft Wiki

Java Edition mentioned features – Minecraft Wiki