Minecraft Amethyst Geodes: Find, Farm and Use Amethyst

A geode shows up as a cave wall that turns dark grey, then white, then opens into a purple room full of crystals. Do not strip it for shards and move on, because the block that grows the crystals cannot be moved, cannot be crafted and cannot be Silk Touched. The geode you are standing in is the farm. This guide covers where geodes generate, how fast amethyst grows, what each tool drops, and what the shards are worth. Numbers are from the Minecraft Wiki and the Java Edition 26.3 vanilla data, the current release as of 2026-11-10.

Amethyst geodes at a glance

Where geodes generate

In the Java world-gen data, the geode feature tries once per chunk with a 1-in-24 rarity filter, at a random height from 6 blocks above the world bottom (Y=-58) up to Y=30. The attempt is cancelled if it hits water, lava, bedrock, ice, packed ice or blue ice (the game's geode_invalid_blocks tag) or air, which the wiki notes is also treated as invalid. The wiki lists geodes as generating in any Overworld biome, and the 26.3 data includes the feature in biomes as different as plains, frozen peaks, lush caves, dripstone caves, mushroom fields and the deep dark, so there is no "geode biome" to hunt for.

Two practical consequences:

• Look for the outer shell, not the crystals. The outer layer is smooth basalt, a dark grey block that appears in few other places (the wiki lists ancient cities). If you see it in a cave wall, the white calcite and the purple core are a few blocks behind it.
• Caves, aquifers and canyons can be overwritten by them. The wiki notes geodes do not connect to caves cleanly, so one often sits half-buried in the wall of a cave you are already exploring. And 95% of geodes generate with a crack that exposes the interior, so the purple usually shows if you light the area.

If you want to skip searching, the wiki's geode page embeds a Chunkbase calculator that maps geode positions from your seed.

What a geode is made of

Three layers, outside to inside:

Blocks of amethyst, calcite and smooth basalt all need a pickaxe to drop. Mine blocks of amethyst freely if you want them for decoration or sculk relays; they are craftable from four shards anyway. Just do not break the budding amethyst.

Budding amethyst: the block you cannot take home

Budding amethyst looks almost like a block of amethyst, and it is the only block that grows crystals. Per the Minecraft Wiki:

• It drops nothing when broken, and Silk Touch does not change that. The Java loot table for it is empty.
• It is destroyed when a piston pushes it, and sticky pistons, slime blocks and honey blocks cannot pull it.
• It is unobtainable in Survival. Creative inventory and commands only.

So every budding block you break is gone from that world for good. Before you mine anything in the inner layer, look closely: budding amethyst has a slightly different texture from the plain block, and in a natural geode buds only ever grow from budding faces, so a block with crystals on it is the one to leave alone.

How amethyst grows

A bud only grows while it is attached to budding amethyst. A bud you place on any other block stays at whatever stage it was.

There are four stages, each with its own light level:

The mechanic, per the wiki: when a budding amethyst gets a random tick, it picks one of its six faces at random and has a 20% chance to either start a small bud there (if the space is air or a water source block) or advance the bud already on that face by one stage. If the chosen face holds anything other than air, a water source block or that face's own bud, the tick does nothing.

With the default random tick speed, a given block gets a random tick about every 68.27 seconds. A specific face therefore advances once every 30 random ticks on average (one in six for the face, times one in five for the 20%), and needs four advances to become a cluster. That is 68.27 x 30 x 4 = 8,192 seconds, about 2 hours 16 minutes, for each exposed face. All six faces grow at the same time, so a fully exposed budding block averages up to six clusters in that window, and a block with three faces buried in calcite averages three.

Two rules that change your farm design:

• Expose every face. Any block against a face, solid or not, stops that face from ever growing.
• The chunk has to be loaded. Since Java 1.21.5, every fully loaded chunk receives random ticks whether or not a player is within 8 chunks, per the wiki's tick article. That means a chunk loader works, but in practice the geode only grows while you, or a loader, keep it loaded. Build your base close to it.

Mining clusters: pickaxe, Fortune and Silk Touch

The Java loot table for an amethyst cluster has three branches, checked in order:

1. Silk Touch: the cluster drops itself. Buds at any stage also drop themselves with Silk Touch.
2. Any pickaxe (wooden through netherite, including copper, per the cluster_max_harvestables tag): 4 shards, then Fortune applies.
3. Anything else, including your hand, a piston push or an explosion: 2 shards (and explosions can destroy some of them).

Fortune uses the standard ore-drop formula on the base 4:

That table is the whole case for harvesting by hand. A piston-based automatic farm gets 2 shards per cluster; a Fortune III pickaxe averages 8.8, more than four times as much. (The wiki's farming tutorial says Fortune III averages 10, which does not match the cluster page or the loot formula. 8.8 is the figure the data supports.) Do not mine buds early: a large bud with a normal pickaxe drops nothing and resets that face to empty.

Turning a geode into a farm

Because the budding blocks cannot move, a farm is built around the geode where it sits. The wiki's amethyst farming tutorial lays out the options. The common thread is to dig out every non-budding block around the budding ones (amethyst, calcite, basalt, stone) so each budding face is open air, light the area so mobs do not spawn, and give yourself a way to reach every face.

My recommendation: unless you need hands-off shards in bulk, build a manual farm and harvest with Fortune III. The automatic designs exist for players who want shards without visiting, and the wiki notes the best of them, flying machines that clear every face, are hard to design. The automatic farms guide covers the observer and piston basics, and the enchantments ranking covers getting Fortune III on a pickaxe.

What amethyst shards are for

In Java 26.3 a shard goes into four crafting recipes, one smithing use and one mob interaction:

A few notes on the ones that matter:

Tinted glass is see-through but blocks light completely, and beacon beams. It drops itself when broken by hand, unlike regular glass, and it cannot be made into panes. It is the clean way to build a dark mob-farm room you can still see into; the mob spawning guide covers why darkness matters.

The spyglass narrows your field of view to one tenth of your setting: 7 degrees at Java's default 70. It is also tied to three advancements, Is It a Bird? (look at a parrot through it), Is It a Balloon? (a ghast) and Is It a Plane? (the ender dragon). See the advancements list for the rest.

The calibrated sculk sensor listens twice as far as a regular one (16 blocks against 8) and can be filtered to a single vibration frequency by powering its amethyst side. Put a block of amethyst next to a sensor and it re-emits the vibration, which is how wireless sculk lines are built. Keep both away from natural sculk shriekers; a calibrated sensor can trigger one within 8 blocks, and a natural shrieker can summon the Warden (see the Deep Dark and Warden guide).

Allays cost one shard per duplicate. The allay guide covers the jukebox duplication trick.

Chest loot: the backup source

If you have not found a geode, two structures carry shards in Java 26.3:

Neither is renewable, and neither gives you budding amethyst, so treat chests as a way to get a spyglass early, not as a supply. The trial chambers guide covers the structure.

Calcite is about to matter

In the Java 26.3 data, calcite has no crafting recipes of its own; it is a decoration block and nothing else. That changes with the upcoming game drop: Java 26.4 Snapshot 7 (November 3, 2026) added a calcite pillar, slab, stairs and wall, plus polished calcite (2x2 calcite) and polished calcite bricks (2x2 polished calcite), each with its own slab, stairs and wall, all also craftable in a stonecutter. Those are snapshot additions and could change before release. Per the wiki, geodes and stony peaks are where calcite generates today (ice caves join them in the drop), so if you are hollowing one out for a farm, keep the calcite instead of tossing it.

One more snapshot detail: the wiki notes that because packed ice is on the invalid list, geodes will rarely generate inside the new ice caves (bug report MC-312663, marked Works As Intended). The ice caves guide covers that biome.

Quick Action Checklist

• Hunt the smooth basalt. Dark grey in a cave wall, between Y=-58 and Y=30, usually means a geode is behind it.
• Never break budding amethyst. It drops nothing, even with Silk Touch, and cannot be moved.
• Clear every face around each budding block; each blocked face never grows.
• Wait about 2 h 16 min of loaded time per face for a full cluster, and stay nearby so the chunk stays loaded.
• Harvest clusters only, with Fortune III: 8.8 shards on average against 4 with a plain pickaxe and 2 from pistons.
• Spend them on a spyglass (1 shard), tinted glass (4 for 2), calibrated sculk sensors (3) and allays.
• Keep the calcite for the 26.4 calcite blocks.