"rock soap" meaning in English

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      "expansion": "rock soap (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rocks",
          "orig": "en:Rocks",
          "parents": [
            "Geology",
            "Natural materials",
            "Earth sciences",
            "Materials",
            "Nature",
            "Sciences",
            "Manufacturing",
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            "Human activity",
            "Fundamental",
            "Human behaviour",
            "Human"
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      ],
      "glosses": [
        "A kind of clay with a smooth, greasy feel."
      ],
      "id": "en-rock_soap-en-noun-p~lPp-y4",
      "links": [
        [
          "clay",
          "clay"
        ],
        [
          "smooth",
          "smooth"
        ],
        [
          "greasy",
          "greasy"
        ]
      ],
      "tags": [
        "uncountable"
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    }
  ],
  "word": "rock soap"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Rocks"
      ],
      "glosses": [
        "A kind of clay with a smooth, greasy feel."
      ],
      "links": [
        [
          "clay",
          "clay"
        ],
        [
          "smooth",
          "smooth"
        ],
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          "greasy",
          "greasy"
        ]
      ],
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        "uncountable"
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  "word": "rock soap"
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