It could be either Diamond Ore (bright blue spots) or Lapis Lazuli Ore (darker blue blocks).
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yes. save a minecraft skin, any kind, then open up your minecraft.jar folder using winrar. after this go to mob then there should be a file called char.png, open up your saved minecraft skin and rename it char (just char). then (while having both side to side) drag your new minecraf skin and drop it into the mob folder. check your minecraft after. hope this helped.
Minecraft is kind of just based on building stuff,surviving monsters,such as skeletons (shoot arrows at you),spiders (attack and also can climb walls),creepers (sneak up on you and blow up),endermen(if you look them in the eyes they will open their mouths and attack you,also teleport if get hurt),spider jokeys (skeleton riding a spider) and zombies (basically wanna eat ur brains,attack you). Also just explore the world of minecraft and begin adventures and stuff. You can basically do what you want! There are also really cool mods and texture packs (change the blocks and items) you can download to add to the game that will allow you to do/have much more things than you could,like mo' creatures (adds more animals) and stuff.
Just press F5, If your on some kind of laptop or something press FN+F5
Unfortunately on non-modded Minecraft version 1.5.2 the highest level enchantment sharpness can go is IV or 4. However if you have access to a Bukkit Minecraft server then you should be able to download and add "Tim the Enchanter" plugin where you can add enchantments of any kind to any item to 127 levels.
You will need an Iron Pickaxe (or better).If you mine it with a wood/stone pickaxe it will break and give you nothing.