noun

• A reddish-black mineral consisting of ferric oxide. It is an important ore of iron.

  ‘The red sandstone is made up of quartz grains coated with hematite, an iron oxide mineral that gives the stone a red colour.’

  More example sentences

  • ‘Like hematite, some goethite is pseudomorphic after a rhombohedral carbonate mineral.’
  • ‘The fluids that precipitated the veins were a likely source for some of the iron that formed the hematite.’
  • ‘Carriers include the iron oxides magnetite and hematite.’
  • ‘Some of the material contained micaceous masses of specular hematite associated with quartz, epidote, and numerous veinlets of calcite.’
  • ‘Impressive blades and masses of lustrous micaceous hematite occur in localized quartz veins, and reniform goethite is found in the walls.’
  • ‘Both areas were selected because they have an ancient layer of hematite, an iron oxide mineral that on Earth almost always forms in an aqueous environment.’
  • ‘This was a steely gray specimen of the mineral hematite which, like many other stones, has a tradition of healing and additional magical influences.’
  • ‘The assemblage present included quartz, chalcopyrite, pyrite, sphalerite, magnetite, and hematite.’
  • ‘Minor hematite gives some specimens a red color.’
  • ‘Most, if not all, of these mines have likely produced specimen-quality hematite, goethite, and perhaps other minerals.’
  • ‘Some hematite replacement erases all traces of the original mineralogy.’
  • ‘Some samples have hematite in the calcite veins.’
  • ‘This colour change occurs over only a few metres on the ground and is probably related to the reduction of hematite to magnetite.’
  • ‘The lakebed is believed to contain hematite, a crystalline iron compound usually formed in the presence of water.’
  • ‘The ironstone is locally represented by hematite matrix-supported vein quartz breccia.’
  • ‘Even if the hematite's origin remains ambiguous, trace amounts of other minerals could serve as additional markers of past water.’
  • ‘The third potential way the hematite could have formed is by oxidation of a mineral called magnetite in basalt and lavas.’
  • ‘Among the simple oxides, only anatase and hematite have been found to date.’
  • ‘Those theories include that the haematite may have formed in a long-lasting lake or in a volcanic environment.’