# Material Extension/Modifications

## Description

Material Extensions are used to extend existing materials.
They savely add data to existing materials without overwriting them, allowing for multiple extensions to apply
to a single material from multiple addons without any issue

### `key` 
the id of the material to be extended

example usage:
```json5
{
    "kw<": "miapi:crystal/diamond",
    "hidden_groups": [
        "custom_gem"
    ],
    "properties": {
        "custom_gem_tag": {
            "durability": "1000"
        }
    }
}
```