Earth Crystal is a crafting component in Monster Hunter World. It is used to craft various Weapons, Armor and Upgrades.
Item Description: Crystalized microbes prized as an abrasive when forging weapons.
Location: Earth Crystal is randomly mined from blue Mining Outcrops in Wildspire Waste:
(Map Locations in Blue Circles)
You can get it from any of these outcrops. It’s best that you go from outcrop to outcrop and mine all of them until it drops. Then fast travel to another map to make everything respawn and go again.
The way mining works is that each map has 3-6 specific types of ore. Each outcrop on that map can drop any of that ore. It’s slightly random. So ore is not restricted to one outcrop, but rather to a certain map.
For all other crafting materials, check out our Monster Hunter World Wiki.