[{"n": "Iceland spar", "u": "/e/minerals-and-gems/iceland-spar/", "s": "Transparent calcite used to demonstrate light polarization."}, {"n": "Ilmenite", "u": "/e/minerals-and-gems/ilmenite/", "s": "Primary ore of titanium and source of white pigment."}, {"n": "Jarosite", "u": "/e/minerals-and-gems/jarosite/", "s": "A sulfate mineral linking Earth's geology to Mars exploration."}, {"n": "Kainite", "u": "/e/minerals-and-gems/kainite/", "s": "An evaporite mineral first found in Stassfurt salt mines."}, {"n": "Kernite", "u": "/e/minerals-and-gems/kernite/", "s": "Hydrated sodium borate mineral used to produce borax."}, {"n": "Kyanite", "u": "/e/minerals-and-gems/kyanite/", "s": "A blue aluminosilicate mineral indicating high-pressure metamorphism."}, {"n": "Labradorite", "u": "/e/minerals-and-gems/labradorite/", "s": "A feldspar mineral known for its iridescent labradorescence."}, {"n": "Lazurite", "u": "/e/minerals-and-gems/lazurite/", "s": "Deep-blue feldspathoid mineral, key component of lapis lazuli."}, {"n": "Lepidolite", "u": "/e/minerals-and-gems/lepidolite/", "s": "A lithium-rich mica and primary source of rubidium."}, {"n": "Limonite", "u": "/e/minerals-and-gems/limonite/", "s": "Limonite is an iron ore made up of a mix of hydrated iron(III) oxide-hydroxides, with a composition that can v"}, {"n": "Magnesite", "u": "/e/minerals-and-gems/magnesite/", "s": "Magnesite is a magnesium carbonate mineral used in refractories and carbon sequestration."}, {"n": "Magnetite", "u": "/e/minerals-and-gems/magnetite/", "s": "Most magnetic naturally occurring mineral, key to paleomagnetism and compasses."}, {"n": "Microcline", "u": "/e/minerals-and-gems/microcline/", "s": "A potassium-rich feldspar with distinctive twinning and atmospheric ice-nucleating properties."}, {"n": "Monazite", "u": "/e/minerals-and-gems/monazite/", "s": "A phosphate mineral group and ore for rare-earth elements."}, {"n": "Muscovite", "u": "/e/minerals-and-gems/muscovite/", "s": "Common mica with perfect cleavage, used historically as window glass."}, {"n": "Native copper", "u": "/e/minerals-and-gems/native-copper/", "s": "Native copper is a natural mineral of uncombined copper."}, {"n": "Ochre", "u": "/e/minerals-and-gems/ochre/", "s": "Natural clay pigment used for art, ritual, and medicine since prehistory."}, {"n": "Olivine", "u": "/e/minerals-and-gems/olivine/", "s": "A common mantle mineral that drives plate tectonics and weathers rapidly."}, {"n": "Oolite", "u": "/e/minerals-and-gems/oolite/", "s": "Sedimentary rock formed from spherical ooid grains."}, {"n": "Orpiment", "u": "/e/minerals-and-gems/orpiment/", "s": "A toxic golden-yellow arsenic sulfide mineral used historically as a pigment."}, {"n": "Orthoclase", "u": "/e/minerals-and-gems/orthoclase/", "s": "A key feldspar mineral forming igneous rocks and gemstones."}, {"n": "Painite", "u": "/e/minerals-and-gems/painite/", "s": "Rare borate mineral named after its discoverer, Arthur C.D. Pain."}]