Here is a muti-piece Minecraft ore block I made. The pieces fit together fairly tightly so you shouldn't need to glue it or anything.

The block stand is mainly in case you want to add a light into the block and it's too high up. If you use the stand the light sits lower and looks better depending on your light fixture. I bought 5 2.75" light pucks for about $15, but any light you can fit in there should work fine.

Updates:

3/11/2021:

• updated Ore_Wall and Ore_Wall_With_Wire_Slot to have slightly bigger holes on the sides so that the male ends fit in better