The block textures in the layer maps and 3D machine previews are selected assets from Faithful 32x for Minecraft Java, by the Faithful Resource Pack team. They come from the official java-latest source at commit cd499e3. See the Faithful License for reuse terms.
The chest faces are cropped from Faithful's chest atlas. The magma block and stonecutter saw use one animation frame. The small lever icon and 3D lever shape are wiki illustrations; the viewer itself uses Three.js under the MIT license. Amethyst Runeworks is an independent Minecraft plugin and is not affiliated with Faithful or Mojang.