[Crystal] Geode Textures

A geode is two materials fighting for the same frame: a dull, chalky rind on the outside and a cavity of crystal points on the inside. That contrast is what makes it visually powerful and what makes it hard to shade, because the same tile has to carry rough opaque rock and sharp refractive quartz at once. These tiles are photographed from cut and broken geodes, agate bands included.

License

Free for personal and commercial use. No attribution required. Commercial games, film, broadcast, print, client work and product design are all permitted. No credit, no backlink, no permission request needed. You may not resell or redistribute the texture files themselves as a texture pack.

Gisang-cheonoe: the idea from beyond the sky

Korean has the phrase gisang-cheonoe — literally "a strange idea, beyond the sky." It is what you call an idea that no one could have arrived at by working carefully through the options. It came from somewhere else. That is the only entry requirement here, and it is not one you can study for.

A geode interior as a nightclub ceiling. Agate banding as a data visualisation. Nobody is going to object.

You do not need to be a professional

The instructions on this page are written for someone who has never done this. There is no assumed vocabulary you need to look up first, and no step that fails silently if you get it slightly wrong. You try it, you see it, you adjust it.

Making it explicit again: you do not need to be an expert. Everything described here is achievable by a total beginner on a first attempt.

Everything here is free

Free to download and free to use, in personal work and in work you charge money for. There is no separate commercial licence to buy.

Once more for clarity: it is all free. No paywall, no watermark, no registration, and no attribution required.

Use it however you want

Recolour it entirely, use only the crystal cavity, use only the rind, tile it as an abstract pattern, or run it as an emission map. It is not reserved for geology.

And again, plainly: use them however you want. The only thing you cannot do is repackage the texture files themselves and sell them on as a pack.

What's in this collection

• Amethyst cavities — dense purple points packed across a curved interior. Fantasy props, jewellery renders, mystical set dressing.
• Agate banding — concentric mineral layers in the geode wall, cut and polished flat. Surface design, print, decorative panels.
• Quartz druse — fine, colourless crystal coating with high specular return. Ice substitutes, alien terrain, magical effects.
• Rough exterior rind — the chalky, unremarkable outside that hides the interior. Rocks, caves, environment filler.

All tiles are seamless in both directions and delivered at high resolution.

Where geode textures are used

Fantasy and game environments. Crystal caves are a staple location, and a photographed geode interior gives far more believable point variation than a procedurally scattered crystal field.

Jewellery and product renders. Agate slices and geode sections are sold as physical products, so the reference material has to match what customers actually receive.

Interior and surface design. Agate patterning appears on real countertops, tiles, and wall panels, and clients ask for it by name.

Album art, print, and motion graphics. Geode interiors are visually dense and instantly readable at any scale, which makes them reliable backgrounds for type.

How to use these in Blender

1. Drag the texture into the Shading node editor to create an Image Texture node.
2. Connect Color to Base Color, then raise Transmission slightly, around 0.2, so the crystal reads as translucent rather than painted.
3. Feed a black-and-white copy into Roughness and invert it so the crystal faces stay sharp while the rind stays matte.
4. Add a Bump node at moderate strength to give the individual crystal points real edge highlights.

How to use these in Unreal Engine 5

1. Import the image into the Content Browser.
2. Create a Material and connect the texture to Base Color.
3. Add a desaturated, inverted copy into Roughness so the points catch light against the dull rind.
4. Add a subtle Emissive contribution masked to the crystal areas if the scene calls for a glowing cave.

How to use these in Unity

1. Drop the image into your Assets folder.
2. Create a Material with the Standard or URP/Lit shader.
3. Assign it to Albedo and raise Smoothness to around 0.7 for the crystal read.
4. Add a Metallic or Smoothness map from the same image so the rind does not shine like the cavity does.

Tips for geode textures specifically

Do not tile the cavity. A geode interior is a one-off object, and repeating it across a surface destroys the illusion immediately because the eye recognises the same crystal cluster twice. Use it as a unique decal or a single mapped face, and save tiling for the rind.

Let the light do the work. Crystal is defined by specular highlights that move, so a static render with flat lighting throws away most of what makes the material readable. Even a slow-moving key light transforms it.

Keep saturation under control. Real amethyst is far less purple than product photography suggests. If your render looks like plastic candy, the fix is usually desaturation rather than more roughness detail.

Browse the collection

Crystal textures are organized into volumes, each containing multiple packs. New volumes are added continuously.

View the full Crystal collection →

Related: Stone, Ice.