Ores

You can get ores in caves,Neither and Dessert Temple Rainbow Ore is rare

Rainbow ore (Legendary)
Rainbow ore can be found in a chest in the dessert temple when you open the chest it explode

Iron ore (Common)
they can be diged without enchant pickaxe and often found in Cave s

Diamond Ore (Rare)
if you used a Pickaxe with Silk Touch VI or VII you only get the ore.

Gold Ore (Common)
it is the same as iron ore.

Emarald Ore (Rare)
Can be mined for Emeralds and with the Silk Touch enchantment you can get the ore.