{
  "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"
}