Minimum crustal abundance (property)

{
    "$id": "https://schemas.anyterial.se/defs/v0.1/properties/altermagnets/min_crustal_abundance",
    "$schema": "https://schemas.optimade.org/meta/v1.3/optimade/property_definition.json",
    "title": "Minimum crustal abundance",
    "x-optimade-type": "float",
    "x-optimade-definition": {
        "kind": "property",
        "version": "0.1.0",
        "format": "1.3",
        "name": "min_crustal_abundance",
        "label": "min_crustal_abundance_altermagnets"
    },
    "x-optimade-unit": "ppm",
    "x-optimade-unit-definitions": [
        {
            "$id": "https://schemas.anyterial.se/defs/v0.1/units/general/ppm",
            "title": "parts per million",
            "symbol": "ppm",
            "display-symbol": "ppm",
            "description": "A dimensionless ratio of one part in one million.",
            "x-optimade-definition": {
                "label": "ppm_general",
                "kind": "unit",
                "format": "1.2",
                "version": "0.1.0",
                "name": "ppm"
            },
            "standard": {
                "name": "gnu units",
                "version": "3.15",
                "symbol": "ppm"
            }
        }
    ],
    "type": [
        "number",
        "null"
    ],
    "description": "The minimum crustal abundance among the constituent elements of the material, given in parts per million by mass.\n\nThe value reflects the scarcest element in the composition.\nA null value means the quantity is not available for this material."
}