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Crystal OpacityMinecraft mod for 1.21.11

Allows you to change how see through a crystal is with lots of settings. or how transparent they are

client onlynewest supported 1.21.11EquipmentDecoration
Latest version
1.21
Minecraft
1.21 to 1.21.11
Java
Java 21+
Loader
Fabric
Licence
LicenseRef-All-Rights-Reserved
Downloads
6.1k
Updated
7 mo ago
Available on
Modrinth

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version Crystal Opacity declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.11Fabric21+declared9 Dec 2025
1.21.10Fabric21+declared7 Oct 2025
1.21.9Fabric21+declared30 Sept 2025
1.21.8Fabric21+declared17 Jul 2025
1.21.7Fabric21+declared30 Jun 2025
1.21.6Fabric21+declared17 Jun 2025
1.21.5Fabric21+declared25 Mar 2025
1.21.4Fabric21+declared3 Dec 2024
1.21.3Fabric21+declared23 Oct 2024
1.21.2Fabric21+declared22 Oct 2024
1.21.1Fabric21+declared8 Aug 2024
1.21Fabric21+declared13 Jun 2024

Download

From Crystal Opacity’s own host. Nothing is re-hosted here.

1.21release7 Mar 2026

CrystalOpacity-1.21.jar · 0.1 MB · for 1.21

Download latest
84908c49848d…
Older versions11
  • 1.21.116 Mar 20261.21.110.1 MB4.4k downloads1ac638476a62…Get
  • 1.21.106 Mar 20261.21.100.1 MB217 downloads4b6e0651f295…Get
  • 1.21.96 Mar 20261.21.90.1 MB36 downloads7989b0ccb228…Get
  • 1.21.86 Mar 20261.21.80.1 MB248 downloads744825fb99db…Get
  • 1.21.76 Mar 20261.21.70.1 MB38 downloads99a80e8f559c…Get
  • 1.21.66 Mar 20261.21.60.1 MB36 downloadsc11cff81fbf6…Get
  • 1.21.56 Mar 20261.21.50.1 MB111 downloads09a589fe0fc9…Get
  • 1.21.46 Mar 20261.21.40.1 MB682 downloadsf6b3bcf5a871…Get
  • 1.21.36 Mar 20261.21.30.1 MB46 downloadsdaaaae330488…Get
  • 1.21.26 Mar 20261.21.20.1 MB27 downloadsf6c994fb7ab0…Get
  • 1.21.16 Mar 20261.21.10.1 MB345 downloads895278689717…Get

Frequently asked

Does Crystal Opacity work on Minecraft 1.21.11?

Yes. 1.21.11 is the newest Minecraft version Crystal Opacity declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Crystal Opacity support?

Everything the author has declared, from 1.21 up to 1.21.11. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Crystal Opacity on the client or the server?

The client only. There is nothing to install on the server side. That is the author's declared design, not a guarantee for every server: one running anti-cheat or missing a counterpart mod can still object.

Which platform or loader does Crystal Opacity support?

Fabric. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Crystal Opacity?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

What licence is Crystal Opacity under?

LicenseRef-All-Rights-Reserved, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Crystal Opacity?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Crystal Opacity safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Details from Modrinth, where the author last updated it on 7 Mar 2026. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .