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  2. Hematite - Wikipedia

    en.wikipedia.org/wiki/Hematite

    Hematite (/ ˈ h iː m ə ˌ t aɪ t, ˈ h ɛ m ə-/), also spelled as haematite, is a common iron oxide compound with the formula, Fe 2 O 3 and is widely found in rocks and soils. [6] Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe 2 O 3. It has the same crystal structure as corundum ...

  3. Interference colour chart - Wikipedia

    en.wikipedia.org/wiki/Interference_colour_chart

    When using the chart, it is important to remember these tips: Isotropic and opaque (metallic) minerals cannot be identified this way. The stage of the microscope should be rotated until maximum colour is found, and therefore, the maximum birefringence. Each mineral, depending on the orientation, may not exhibit the maximum birefringence.

  4. Caput mortuum (pigment) - Wikipedia

    en.wikipedia.org/wiki/Caput_mortuum_(pigment)

    Caput mortuum (Latin for 'dead head', and variously spelled caput mortum or caput mortem), also known as cardinal purple, is the name given to a purple variety of hematite iron oxide pigment, used in oil paints and paper dyes. Due to the cultural significance of its deep purple colour, it was very popular for painting the robes of religious ...

  5. Ochre - Wikipedia

    en.wikipedia.org/wiki/Ochre

    Ochre pigment. Ochre (/ ˈ oʊ k ər / OH-kər; from Ancient Greek ὤχρα (ṓkhra), from ὠχρός (ōkhrós) 'pale'), iron ochre, or ocher in American English, is a natural clay earth pigment, a mixture of ferric oxide and varying amounts of clay and sand. [1]

  6. Iron oxide - Wikipedia

    en.wikipedia.org/wiki/Iron_oxide

    The brown color indicates that iron is at the oxidation state +3. Green and reddish brown stains on a limestone core sample, respectively corresponding to oxides/hydroxides of Fe 2+ and Fe 3+ . Iron oxides feature as ferrous ( Fe(II) ) or ferric ( Fe(III) ) or both.

  7. Red pigments - Wikipedia

    en.wikipedia.org/wiki/Red_pigments

    The color of red and other pigments is determined by the way it absorbs certain parts of the spectrum of visible light and reflects the others. The brilliant opaque red of vermillion , for example, results because vermillion reflects the major part of red light, but absorbs the blue, green and yellow parts of white light.

  8. The 20 best gifts to give someone you don't know very well - AOL

    www.aol.com/lifestyle/the-best-gifts-to-give...

    It's edged with knotted fringe for an extra cozy texture. Get it on sale in all 11 colors. $32 at Nordstrom. Fly By Jing. Fly By Jing Sichuan Chili Crisp.

  9. Iron(III) oxide - Wikipedia

    en.wikipedia.org/wiki/Iron(III)_oxide

    Iron(III) oxide in a vial. Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe 2 O 3.It occurs in nature as the mineral hematite, which serves as the primary source of iron for the steel industry.

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