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 - My End Portal isn't working - Arqade

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minecraft java edition - Why can't I make any Tinkers Construct parts with iron? - Arqade

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

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Java Edition 1.17 – Minecraft Wiki

minecraft java edition - Why won't my nether portal bring me back where I left? - Arqade

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

Everything about Minecraft Java, the original blocky sandbox