{
  "api": "minerals",
  "title": "Common Minerals",
  "description": "Common rock-forming and economically important minerals and their properties.",
  "emoji": "💎",
  "license": "GPL-2.0-or-later",
  "count": 26,
  "self": "https://gratisapi.com/api/minerals/index",
  "endpoints": {
    "list": "https://gratisapi.com/api/minerals/index",
    "item": "https://gratisapi.com/api/minerals/{id}"
  },
  "fields": [
    "chemical_formula",
    "color",
    "id",
    "luster",
    "mohs_hardness",
    "name"
  ],
  "results": [
    {
      "id": "quartz",
      "name": "Quartz",
      "chemical_formula": "SiO2",
      "mohs_hardness": 7.0,
      "color": "Colorless to white, purple, pink, or smoky",
      "luster": "Vitreous",
      "url": "https://gratisapi.com/api/minerals/quartz"
    },
    {
      "id": "feldspar",
      "name": "Orthoclase Feldspar",
      "chemical_formula": "KAlSi3O8",
      "mohs_hardness": 6.0,
      "color": "White, pink, or grey",
      "luster": "Vitreous",
      "url": "https://gratisapi.com/api/minerals/feldspar"
    },
    {
      "id": "mica-muscovite",
      "name": "Muscovite Mica",
      "chemical_formula": "KAl2(AlSi3O10)(OH)2",
      "mohs_hardness": 2.5,
      "color": "Colorless to silvery or pale brown",
      "luster": "Pearly",
      "url": "https://gratisapi.com/api/minerals/mica-muscovite"
    },
    {
      "id": "mica-biotite",
      "name": "Biotite Mica",
      "chemical_formula": "K(Mg,Fe)3(AlSi3O10)(OH)2",
      "mohs_hardness": 2.75,
      "color": "Black to dark brown",
      "luster": "Vitreous",
      "url": "https://gratisapi.com/api/minerals/mica-biotite"
    },
    {
      "id": "calcite",
      "name": "Calcite",
      "chemical_formula": "CaCO3",
      "mohs_hardness": 3.0,
      "color": "Colorless, white, or pale tints",
      "luster": "Vitreous",
      "url": "https://gratisapi.com/api/minerals/calcite"
    },
    {
      "id": "dolomite",
      "name": "Dolomite",
      "chemical_formula": "CaMg(CO3)2",
      "mohs_hardness": 3.75,
      "color": "White, grey, or pinkish",
      "luster": "Vitreous",
      "url": "https://gratisapi.com/api/minerals/dolomite"
    },
    {
      "id": "gypsum",
      "name": "Gypsum",
      "chemical_formula": "CaSO4·2H2O",
      "mohs_hardness": 2.0,
      "color": "Colorless, white, or grey",
      "luster": "Vitreous to silky",
      "url": "https://gratisapi.com/api/minerals/gypsum"
    },
    {
      "id": "halite",
      "name": "Halite",
      "chemical_formula": "NaCl",
      "mohs_hardness": 2.5,
      "color": "Colorless, white, or tinted",
      "luster": "Vitreous",
      "url": "https://gratisapi.com/api/minerals/halite"
    },
    {
      "id": "fluorite",
      "name": "Fluorite",
      "chemical_formula": "CaF2",
      "mohs_hardness": 4.0,
      "color": "Purple, green, blue, or yellow",
      "luster": "Vitreous",
      "url": "https://gratisapi.com/api/minerals/fluorite"
    },
    {
      "id": "apatite",
      "name": "Apatite",
      "chemical_formula": "Ca5(PO4)3(F,Cl,OH)",
      "mohs_hardness": 5.0,
      "color": "Green, blue, yellow, or brown",
      "luster": "Vitreous",
      "url": "https://gratisapi.com/api/minerals/apatite"
    },
    {
      "id": "hematite",
      "name": "Hematite",
      "chemical_formula": "Fe2O3",
      "mohs_hardness": 6.0,
      "color": "Steel grey to reddish brown",
      "luster": "Metallic to earthy",
      "url": "https://gratisapi.com/api/minerals/hematite"
    },
    {
      "id": "magnetite",
      "name": "Magnetite",
      "chemical_formula": "Fe3O4",
      "mohs_hardness": 6.0,
      "color": "Black",
      "luster": "Metallic",
      "url": "https://gratisapi.com/api/minerals/magnetite"
    },
    {
      "id": "pyrite",
      "name": "Pyrite",
      "chemical_formula": "FeS2",
      "mohs_hardness": 6.25,
      "color": "Brass yellow",
      "luster": "Metallic",
      "url": "https://gratisapi.com/api/minerals/pyrite"
    },
    {
      "id": "galena",
      "name": "Galena",
      "chemical_formula": "PbS",
      "mohs_hardness": 2.5,
      "color": "Lead grey",
      "luster": "Metallic",
      "url": "https://gratisapi.com/api/minerals/galena"
    },
    {
      "id": "sphalerite",
      "name": "Sphalerite",
      "chemical_formula": "ZnS",
      "mohs_hardness": 3.75,
      "color": "Yellow, brown, to black",
      "luster": "Resinous to adamantine",
      "url": "https://gratisapi.com/api/minerals/sphalerite"
    },
    {
      "id": "chalcopyrite",
      "name": "Chalcopyrite",
      "chemical_formula": "CuFeS2",
      "mohs_hardness": 3.75,
      "color": "Brass to golden yellow",
      "luster": "Metallic",
      "url": "https://gratisapi.com/api/minerals/chalcopyrite"
    },
    {
      "id": "graphite",
      "name": "Graphite",
      "chemical_formula": "C",
      "mohs_hardness": 1.5,
      "color": "Steel grey to black",
      "luster": "Metallic to dull",
      "url": "https://gratisapi.com/api/minerals/graphite"
    },
    {
      "id": "talc",
      "name": "Talc",
      "chemical_formula": "Mg3Si4O10(OH)2",
      "mohs_hardness": 1.0,
      "color": "White, grey, or pale green",
      "luster": "Pearly to greasy",
      "url": "https://gratisapi.com/api/minerals/talc"
    },
    {
      "id": "corundum",
      "name": "Corundum",
      "chemical_formula": "Al2O3",
      "mohs_hardness": 9.0,
      "color": "Colorless, red (ruby), or blue (sapphire)",
      "luster": "Adamantine to vitreous",
      "url": "https://gratisapi.com/api/minerals/corundum"
    },
    {
      "id": "diamond",
      "name": "Diamond",
      "chemical_formula": "C",
      "mohs_hardness": 10.0,
      "color": "Colorless to yellow, brown, or blue",
      "luster": "Adamantine",
      "url": "https://gratisapi.com/api/minerals/diamond"
    },
    {
      "id": "topaz",
      "name": "Topaz",
      "chemical_formula": "Al2SiO4(F,OH)2",
      "mohs_hardness": 8.0,
      "color": "Colorless, blue, yellow, or pink",
      "luster": "Vitreous",
      "url": "https://gratisapi.com/api/minerals/topaz"
    },
    {
      "id": "garnet",
      "name": "Garnet",
      "chemical_formula": "Fe3Al2(SiO4)3",
      "mohs_hardness": 7.25,
      "color": "Deep red, brown, or green",
      "luster": "Vitreous to resinous",
      "url": "https://gratisapi.com/api/minerals/garnet"
    },
    {
      "id": "olivine",
      "name": "Olivine",
      "chemical_formula": "(Mg,Fe)2SiO4",
      "mohs_hardness": 6.75,
      "color": "Olive green to yellow-green",
      "luster": "Vitreous",
      "url": "https://gratisapi.com/api/minerals/olivine"
    },
    {
      "id": "malachite",
      "name": "Malachite",
      "chemical_formula": "Cu2CO3(OH)2",
      "mohs_hardness": 3.75,
      "color": "Bright green",
      "luster": "Silky to dull",
      "url": "https://gratisapi.com/api/minerals/malachite"
    },
    {
      "id": "azurite",
      "name": "Azurite",
      "chemical_formula": "Cu3(CO3)2(OH)2",
      "mohs_hardness": 3.75,
      "color": "Deep azure blue",
      "luster": "Vitreous",
      "url": "https://gratisapi.com/api/minerals/azurite"
    },
    {
      "id": "sulfur",
      "name": "Sulfur",
      "chemical_formula": "S",
      "mohs_hardness": 2.0,
      "color": "Bright yellow",
      "luster": "Resinous",
      "url": "https://gratisapi.com/api/minerals/sulfur"
    }
  ]
}