"mineral de hierro" meaning in Spanish

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "mineral",
        "3": "de",
        "4": "hierro",
        "t1": "mineral",
        "t2": "of",
        "t3": "iron"
      },
      "expansion": "mineral (“mineral”) + de (“of”) + hierro (“iron”)",
      "name": "affix"
    }
  ],
  "etymology_text": "From mineral (“mineral”) + de (“of”) + hierro (“iron”).",
  "forms": [
    {
      "form": "minerales de hierro",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "mineral de hierro m (plural minerales de hierro)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "es",
          "name": "Geology",
          "orig": "es:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "iron ore"
      ],
      "id": "en-mineral_de_hierro-es-noun-NPgNv9ra",
      "links": [
        [
          "iron ore",
          "iron ore"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "mineral de hierro"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "mineral",
        "3": "de",
        "4": "hierro",
        "t1": "mineral",
        "t2": "of",
        "t3": "iron"
      },
      "expansion": "mineral (“mineral”) + de (“of”) + hierro (“iron”)",
      "name": "affix"
    }
  ],
  "etymology_text": "From mineral (“mineral”) + de (“of”) + hierro (“iron”).",
  "forms": [
    {
      "form": "minerales de hierro",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "mineral de hierro m (plural minerales de hierro)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Spanish compound terms",
        "Spanish countable nouns",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish masculine nouns",
        "Spanish multiword terms",
        "Spanish nouns",
        "es:Geology"
      ],
      "glosses": [
        "iron ore"
      ],
      "links": [
        [
          "iron ore",
          "iron ore"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "mineral de hierro"
}