Opalescence
by mariu_73
Opalescence adds opal crystal blocks, a budding opal that grows crystals under moonlight, and a composter loop for generating crystals on Forge and NeoForge.
What it does
Opalescence brings opal crystals into the world. A budding opal grows moonlit opal crystals when a specific Spectrum block is placed under it and it receives direct moonlight, and the crystals can be cut into blocks with a stonecutter, while sandpaper is required for some opal blocks. The mod is published for two game versions, 1.20.1 and 1.21.1, and needs Spectrum to craft the budding opal.
Crystal growth also uses organic matter. Guano and organic compost placed in a composter grow unpleasant opal crystals, and amethyst golems gather grown opal crystals. The mod is client and server, so the server and every player need it. Forge builds are 1.0.4 for 1.20.1 and NeoForge builds are 1.0.4 for 1.21.1, both published on 2026-01-24, under the MIT License as open source.
Key features
Budding opal
Budding opal is crafted with help from Spectrum and grows moonlit opal crystals when a specific Spectrum block sits beneath it.
Opal crystal blocks
Opal crystals can be cut into blocks with a stonecutter, and some opal blocks are shaped with sandpaper instead.
Composter crystal growth
Guano and organic compost placed in a composter grow unpleasant opal crystals.
Amethyst golem gathering
Amethyst golems collect fully grown opal crystals from the world.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Decorating with opal
Builders can use the opal blocks and rainbow block variety in structures and interiors.
Farm-style crystal production
A composter loop turns organic items into unpleasant opal crystals for players who want a steady supply.
Who it’s for: Players who want opal crystal decoration and growth mechanics in a Forge or NeoForge world, on a single player or multiplayer server that installs the mod on both sides.
How it compares
Elevated Ores is a Forge mod for 1.16.5 – 1.20.1 with the same client and server environment, under All rights reserved and not open source. Geo Expansion is a NeoForge mod for 1.21.1 – 1.21.8 that runs on the server alone, under All rights reserved and not open source. Opalescence is open source under the MIT License and needs both sides for 1.20.1 and 1.21.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Opalescence | Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-01-24 |
| Elevated Ores | Forge | 1.16.5 – 1.20.1 | Client and server | 2026-05-03 |
| Geo Expansion | NeoForge | 1.21.1 – 1.21.8 | Server-side only | 2026-07-18 |
Questions
Which loaders does Opalescence support?
Does Opalescence need Spectrum?
Must the server have Opalescence installed?
In the catalog
Opalescence is one of 8,515 World generation mods on ModsFinder, and one of 5,058 World generation mods for Forge. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
Alex's Caves: - Guano Block can be used in place of a Composter to grow Unpleasant Opal Crystals Ars Nouveau: - Amethyst Golems can gather grown Opal Crystals
Official listing
- Modrinth page
- modrinth.com/mod/opalescence
- Owner
- mariu_73
- Published
- 2025-04-30
- Updated on Modrinth
- 2026-01-24
- Facts verified
- 2026-10-15