{
  "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"
}