Layers of the planet: crust to core.

The five layers

Depths below are in blocks, counted down from sea level, on the home planet at its usual size. Temperatures are the rock's own heat at that depth, and pressures are in atmospheres (air at the surface is 1 atm).

Layer	Depth (blocks)	Heat (C)	Pressure (atm)	What the rock is
Crust	0 to 300	14 at the top, about 129 at the bottom	1 to about 26	Soil, sand, stone, granite, basalt, slate, marble and gneiss. Copper, tin, iron, coal and the gems.
Upper Mantle	300 to 1,200	about 129 to 713	about 26 to 232	Peridotite, eclogite and ringwoodite. Rutile, chromite, nickel, rubies, sapphires and emeralds.
Lower Mantle	1,200 to 2,200	about 713 to 1,551	about 232 to 610	Bridgmanite, ferropericlase and davemaoite. Tungsten, molybdenum, vanadium and diamond.
Outer Core	2,200 to 2,800	about 1,551 to 2,117	about 610 to 896	Kamacite and taenite, with seas of molten iron-nickel. Pyrrhonite and platinum.
Inner Core	2,800 to 3,000	about 2,117 to 2,314	about 896 to 1,001	Hexaferrum, with the glowing Stellarite pillars of the Heart Chamber.

The edges between layers are not perfectly straight. They wander a few blocks up or down, so you may find the next layer's rock a little early.

The Crust

The Crust is the layer you live on. Near the top (the first 80 blocks or so) the rock is mostly stone, limestone, shale, slate, andesite and chalk. Below that, down to about 200 blocks, you meet granite, basalt, marble and more andesite. Deeper still the rock is mostly gneiss, granite and basalt. Copper and tin come from the top of the Crust, while the rarer gems and gold-bearing quartz sit lower down. See Ores by depth for the full list.

The Upper Mantle

Below 300 blocks the rock changes to the dark, heavy rock of the mantle. This is where the first cutting metals and the rubies, sapphires and emeralds turn up. You will need a good iron or steel tool here (see Digging and mining).

The Lower Mantle

From 1,200 blocks the heat is above 700 C and the pressure is past 200 atmospheres. Tungsten, molybdenum, vanadium and diamond are found here. Gear for this layer must hold both the heat and the pressure, so check your suit ratings on the Strata Gauge before you go down. The gauge is explained in Going deep.

The Outer Core

The Outer Core is hotter than most furnaces can hold for long, and it is where the first seas of molten metal lie. In every band of 150 blocks the lower part is liquid. Anything that touches it burns or melts unless it is made to take the heat. Pyrrhonite, the metal that makes the Coreforged tools, is found here.

The Inner Core

The Inner Core is the last 200 blocks above the centre. Stellarite is found here and only yields to a Coreforged pickaxe. Between about 2,964 and 2,996 blocks there is a vast glowing void called the Heart Chamber, lit by Stellarite pillars standing up from its floor. Below about 2,996 blocks the rock is Heartstone, which cannot be broken at all. That is the bottom of the planet.

Caves and lava below the surface

Caves run through every layer. Below about 320 blocks, the floors of caves can be filled with lava, in bands that sit about 100 blocks apart. A lava pool that you open into is dangerous, so look before you step down into a cave floor. Deep caves can also hold lakes of still water up in the bigger caverns near the surface.

Other worlds

These numbers are for the home planet. Other planets have their own core. A cold world's core is much cooler, and a crystal-core world is hotter at the bottom than a cold one, so check the Strata Gauge when you arrive.

Tips

• Dig with a tool that is strong enough. Each layer asks for a better tool (see the table in Digging and mining).
• Bring a cooling suit and a pressure suit before the Upper Mantle, and check the Strata Gauge again at each layer.
• Place beacons to get back to a depth you have already reached without climbing out.
• For the ores each layer holds, read Ores by depth.

← Back to the wiki · Last updated 25 October 2026. Mantlenaut is in alpha, so things change.