cobbled deepslate unless you wanna silk it then rebreak it. I usually silk any other deepslate block like diamond, redstone, coal, etc. you can't change deepslate into anything but deepslate but cobbled can be used for stairs, slabes, etc. Hope that helped. =]
Thank you for the comments. I'll start using a non-silk touch pickaxe while out mining DS. I haven't built with DS so I didn't know it needed to be cobbled.
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