To get Quartz Glass in Grounded 2’s Into the Abyss update, mine Phantom Quartz in the underwater crystal cave beneath Gnarly Park, grind it into Crushed Quartz, use Crushed Quartz to make Fire Bricks, analyze a Fire Brick to unlock Quartz Glass, then craft Quartz Glass at a Kiln with Crushed Quartz and Horsetail Stem.
Quartz Glass is part of the new underwater-building progression, so it is not something you simply scoop up from the cave floor. The first real job is finding Phantom Quartz, then moving that material through the right crafting stations until the Kiln recipe becomes available.
Quartz Glass requirements in Grounded 2
| Stage | What |
|---|---|
| Phantom Quartz | Mine crystal nodes in the underwater cave beneath Gnarly Park. |
| Crushed Quartz | Use Phantom Quartz Shards at a Quern. |
| Fire Brick | Craft it in an Oven using Clay and Crushed Quartz. |
| Analysis unlock | Analyze a Fire Brick at a Resource Analyzer. |
| Quartz Glass | Craft it at a Kiln using Crushed Quartz and Horsetail Stem. |
The full chain uses four stations: Quern, Oven, Resource Analyzer, and Kiln. Treat Phantom Quartz as the starting resource, because everything after that depends on turning it into processed materials.
Phantom Quartz location in Grounded 2 Into the Abyss
Phantom Quartz is found inside a dark cave system under the tree/root area in Gnarly Park. Look for the cave entrance tucked under the tree roots, then head through the tunnel until it opens toward a deep water chamber with glowing crystal nodes.
Bring a torch before entering, because the route is dark and hostile creatures are inside. Toe Biter Nymphs appear along the cave route, and using a buggy or mount helps you move through the tunnel faster if you already have one available.
The entrance is shown visually on the map, but there is no text-based coordinate callout to rely on. Use Gnarly Park, the tree roots, and the water-side cave opening as your landmarks instead of chasing a made-up coordinate.
How to reach the crystal cave and craft Quartz Glass in Grounded 2
This route takes you from the Gnarly Park cave entrance to the Phantom Quartz farm, then through the crafting unlock that makes Quartz Glass available.
STEP 1/10
Find the cave entrance under Gnarly Park
Open the map around GNARLY PARK and head for the cave entrance under the tree/root area near the water.
STEP 2/10
Enter the dark tunnel with a torch
Ride in with a mount or buggy if you have one, and keep a torch out while moving through the cave.
STEP 3/10
Push past the cave enemies
Expect Toe Biter Nymphs and other hostile creatures as you cross toward the far side of the tunnel.
STEP 4/10
Drop into the water chamber
Move through the cave until you reach the ledge above the glowing water area, then enter the pool below.
STEP 5/10
Mine the Phantom Quartz nodes
Swim down into the crystal cavern and harvest the Phantom Quartz nodes to collect Phantom Quartz Shards.
STEP 6/10
Clear the crystal cave
Break every visible crystal node in the underwater cavern, because the cave holds many nodes and Quartz Glass needs repeat material farming.
STEP 7/10
Make Crushed Quartz at the Quern
Use the Quern to process your Phantom Quartz Shards into Crushed Quartz.
STEP 8/10
Bake Fire Brick in the Oven
Use the Oven to make Fire Brick from Clay and Crushed Quartz.
STEP 9/10
Analyze the Fire Brick
Take a Fire Brick to any Resource Analyzer to unlock Quartz Glass and Marine Walls Building recipes.
STEP 10/10
Craft Quartz Glass at the Kiln
Use a Kiln to craft Quartz Glass from Crushed Quartz and Horsetail Stem.
Video help
Best Phantom Quartz farming route
For repeat Quartz Glass crafting, clear the entire underwater crystal cave whenever you go in. The cave contains many Phantom Quartz nodes, and the material becomes a steady bottleneck once you start making Into the Abyss building pieces.
Return with combat and dive safety covered, especially if you are farming several nodes in one trip. The cave route has enemies, and the crystals sit in or near deep water, so bring the tools and breathing setup you need before committing to a full harvest.
Mine every Phantom Quartz node before leaving the cave, because Quartz Glass crafting burns through the chain quickly once Marine building recipes open up.
Quartz Glass uses in Grounded 2
Analyzing a Fire Brick unlocks Quartz Glass along with Marine Walls Building recipes. That ties Quartz Glass directly to the underwater-building side of Into the Abyss, where bases, oxygen support, and pond-focused structures become a major part of progression.
Key Do not treat Quartz Glass as a loose pickup or a basic cave mineral. It sits behind the Fire Brick analysis step, then moves into Kiln crafting once the recipe is learned.
Related Grounded 2 guides
Frequently Asked Questions
Can you pick up Quartz Glass directly in Grounded 2?
No. Quartz Glass is crafted at a Kiln; the cave gives you Phantom Quartz Shards, which must be processed first.
What do you analyze to unlock Quartz Glass?
Analyze a Fire Brick at a Resource Analyzer. That analysis adds Quartz Glass to your available recipes.
Which raw material should you farm first for Quartz Glass?
Farm Phantom Quartz first. It becomes Crushed Quartz, which feeds both the Fire Brick unlock path and the final Quartz Glass craft.
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