Red Crystals are found while mining underground in all five Biomes and occasionally as loot from a Chest.
When placed they can cause minor collision damage, unlike Large Red Crystals.
Once mined, they will appear in the Resources section of your Inventory.
All Crystals are valuable in Deepworld. Most crystals are used in crafting advanced items and can also be used in Markets to trade for items with other players.
Beginner's Tip: Red Crystals emit a light glow that is often noticeable from a distance. This can help you discover them while mining.