Are you using the correct pickaxe? While coal ore (black) can be mined with any pickaxe, iron ore (creamy) needs a stone pickaxe, redstone (red) needs an iron pickaxe, diamond (light blue) needs iron, gold (yellow) needs iron and Lapis (dark blue) needs stone. I hope this helps!
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Are you using the correct pickaxe? While coal ore (black) can be mined with any pickaxe, iron ore (creamy) needs a stone pickaxe, redstone (red) needs an iron pickaxe, diamond (light blue) needs iron, gold (yellow) needs iron and Lapis (dark blue) needs stone. I hope this helps!