"peacock copper" meaning in English

{
  "etymology_text": "After the rainbow iridescence that appears after tarnishing.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "peacock copper (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1920, Douglas Clermont Livingston, The Copper Deposits of the Seven Devils and Adjacent Districts:",
          "text": "The ores are of two general types, chalcopyrite or “yellow copper,” with very little bornite or other minerals richer in copper, and those in which the values lie almost wholly in bornite or “peacock copper.”",
          "type": "quote"
        }
      ],
      "glosses": [
        "Bornite."
      ],
      "id": "en-peacock_copper-en-noun-Ql75WY7J",
      "links": [
        [
          "Bornite",
          "bornite"
        ]
      ],
      "raw_glosses": [
        "(informal) Bornite."
      ],
      "synonyms": [
        {
          "word": "peacock ore"
        }
      ],
      "tags": [
        "informal",
        "uncountable"
      ]
    }
  ],
  "word": "peacock copper"
}

{
  "etymology_text": "After the rainbow iridescence that appears after tarnishing.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "peacock copper (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1920, Douglas Clermont Livingston, The Copper Deposits of the Seven Devils and Adjacent Districts:",
          "text": "The ores are of two general types, chalcopyrite or “yellow copper,” with very little bornite or other minerals richer in copper, and those in which the values lie almost wholly in bornite or “peacock copper.”",
          "type": "quote"
        }
      ],
      "glosses": [
        "Bornite."
      ],
      "links": [
        [
          "Bornite",
          "bornite"
        ]
      ],
      "raw_glosses": [
        "(informal) Bornite."
      ],
      "tags": [
        "informal",
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "peacock ore"
    }
  ],
  "word": "peacock copper"
}