Phantom Quartz is the Tier 3 crystal that unlocks the underwater-building side of the Into the Abyss update, and it lives in exactly one place: a flooded grotto beneath the Gnarly Bark biome. Break the glowing pink formations there and you collect Phantom Quartz Shards, the raw material that starts the Crushed Quartz to Fire Brick to Quartz Glass chain.
Quick answer: Bring a Tier 3 Omni-Hammer and a torch, travel to the pond by the Paper Boat and Ranger Outpost: Gnarly Bark, enter the cave tucked under the large tree root, swim straight through the underwater tunnel, then smash the Phantom Quartz cluster on the interior bank to get your first Phantom Quartz Shards.
What you need before mining Phantom Quartz
Phantom Quartz nodes will not break with a lower-tier tool, and the grotto is dark and partly flooded. Reaching the cave without the right hammer means you simply cannot harvest the deposits, so sort this out first.
| Requirement | Why it matters |
|---|---|
| Tier 3 Omni-Hammer | The only tool that breaks the larger Phantom Quartz formations. |
| Torch or light source | Visibility inside the flooded cave is poor; you will miss wall minerals without one. |
| Underwater gear (Diving Suit Armor or Koi Fish Scale Armor) | Lets you swim and breathe through the submerged tunnel and deeper nodes. |
| Healing items and inventory space | Enemies patrol the route, and you will want room for several shards per run. |
Tip: A Toe Biter Buggy or your Youhu mount is not required, but it moves you between deposits faster and helps against the Water Nymphs controlling the area.
Phantom Quartz location and route to the grotto
Phantom Quartz Shards come exclusively from the underground grotto below Gnarly Bark, reachable through the large opening along its border with Skunk Pond. The nearest landmarks are the Paper Boat and the Ranger Outpost: Gnarly Bark, right where the pond meets the tree.
This first node is the easiest pickup in the whole area because it skips nearly all the combat. Slow down as you surface so you do not blow past it.
Farming the deeper crystals safely
The same cave holds many more Phantom Quartz deposits, scattered both underwater and along the interior further in. From the first crystal, keep heading left and deeper to reach them. This is also where a Toe Biter Nest sits, so treat it as a dangerous zone.
Two Whipper Earwigs guard the next set of crystals, and Toe Biter Nymphs appear along the route. Clear both Earwigs, and you will find another pair of clusters right there, with more sitting underwater beyond that. Since a lot of the nodes are submerged, you will be diving and surfacing constantly, so keep your breathing setup and a light source ready.
For steady Quartz Glass production, clear every accessible node whenever you enter. The material becomes a bottleneck fast once you start building Into the Abyss underwater structures.
Confirm the harvest and unlock the recipes
You know the mining worked when Phantom Quartz Shards land in your inventory after the formation shatters. To turn that into progress, take a shard to a Ranger Station or Resource Analyzer and analyze it. That analysis unlocks Crushed Quartz, the Quern, and the Crystal Trident, confirming the chain is now open to you.
Two common mistakes stop people here. The first is searching the open pond for the crystals instead of the cave under the tree root. The second is confusing Phantom Quartz with the older quartzite found elsewhere in the park; they are separate materials, so do not hunt for it in the wrong spots.
What Phantom Quartz Shards are used for
Most of the shards feed a processing chain that leads to top-tier building materials. You grind them at the Quern, bake Fire Bricks in the Oven, then craft Quartz Glass at the Kiln once the recipe is unlocked. Shards also go directly into a few weapons, trinkets, and décor.
| Item | Recipe | Station |
|---|---|---|
| Crushed Quartz | 1 Phantom Quartz Shard | Quern |
| Fire Brick | 4 Clay + 1 Crushed Quartz | Oven |
| Quartz Glass | 2 Crushed Quartz + 1 Horsetail Stem | Kiln |
| Crystal Trident | 3 Phantom Quartz Shard + 3 Eelgrass Strand + 2 Diving Bell Spider Chunk + 2 Sunken Bone | Workbench |
| The Crown Jewel (trinket) | 3 Phantom Quartz Shard + 2 Gold Foil + 2 Mighty Glob | Forbidden Workbench |
| Gloom Sconce (lighting) | 1 Eelgrass Strand + 1 Purple Jelly Chunk + 1 Phantom Quartz Shard + 1 Gloom Sap | Crafted in World |
The processed path is what gates the update’s underwater progression. Analyzing a Fire Brick unlocks both Quartz Glass and the Marine building pieces, and Quartz Glass then goes into the Diving Helmet, Diving Suit Chestplate, Pressure Cooker, and windowed Marine walls. Fire Brick itself is used for the Diving Boots and the Kiln, so a single trip to the Gnarly Bark grotto ends up powering a large chunk of your sub-aquatic base. Keep some Crushed Quartz in reserve, because it also feeds the Toenail Cutlass and parts of the Toe Biter armor set.
