Synonymer & Information om | Engelska ordet HEMATITE

Exempel på hur man kan använda HEMATITE i en mening

• Limonite is one of the three principal iron ores, the others being hematite and magnetite, and has been mined for the production of iron since at least 400 BC.
• Ores containing very high quantities of hematite or magnetite, typically greater than about 60% iron, are known as natural ore or direct shipping ore, and can be fed directly into iron-making blast furnaces.
• Pure ilmenite is paramagnetic (showing only very weak attraction to a magnet), but ilmenite forms solid solutions with hematite that are weakly ferromagnetic and so are noticeably attracted to a magnet.
• Placer environments typically contain black sand, a conspicuous shiny black mixture of iron oxides, mostly magnetite with variable amounts of ilmenite and hematite.
• Only a few oxides are significant at the earth's surface, particularly wüstite, magnetite, and hematite.
• The artists used charcoal and ochre or hematite to create the images, often diluting these pigments to produce variations in intensity and creating an impression of chiaroscuro.
• However, the boundaries of the hematite-bearing plain were operationally defined in the late 1990s and early 2000s by the extent of the orbital detection of the plain's surface hematite by the thermal emission spectrometer (TES) on the satellite Mars Global Surveyor.
• A variant of ochre containing a large amount of hematite, or dehydrated iron oxide, has a reddish tint known as red ochre (or, in some dialects, ruddle).
• Pure quartzite is usually white to grey, though quartzites often occur in various shades of pink and red due to varying amounts of hematite.
• Iron in taconite is commonly present as magnetite, iron silicates, and iron-bearing carbonates, and locally martite (hematite) formed by oxidation of magnetite.
• At this site, which radiocarbon dating indicates to be about 43,000 years old, paleolithic humans mined mineral hematite, which contained iron and was ground to produce the red pigment ochre.
• Psilomelane is erroneously, and uncommonly, known as black hematite, despite not being related to true hematite, which is an iron oxide.
• Ooids are most commonly composed of calcium carbonate (calcite or aragonite), but can be composed of phosphate, clays, chert, dolomite or iron minerals, including hematite.
• In Devon, on the eastern edge of Dartmoor, the remains of mines that produced micaceous hematite, used as pounce to dust early ink to prevent smearing, are known locally as "treacle mines" since they show a glistening black residue that looks like treacle.
• 205 billion tons of iron ore of 50% iron, mainly in hematite and magnetite form, and in lesser quantities in siderite and manganese minerals.
• Above Marysvale Canyon, the colorful formations of Big Rock Candy Mountain are a widely recognized geological site in central Utah; yellow, red and orange bands are the result of jarosite, hematite and pyrite while white bands result from alunite and kaolinite presence.
• In early the 2000s, the hematite map of Figure 1b and the confirmation (from the topography mapping done by the Mars Global Surveyor) that this area is a flat plain and relatively easy to land on were the decisive pieces of evidence for choosing the Meridiani Planum as one of the landing sites for NASA's two bigger.
• Iron in the form of specular hematite is available in the Marbat plain, within a few days' hike to the east of Khor Kharfot.
• Pyrolusite occurs associated with manganite, hollandite, hausmannite, braunite, cryptomelane, chalcophanite, goethite, and hematite under oxidizing conditions in hydrothermal deposits.
• alt=A grayscale map of an area on Mars (from 5° N to 6° S and from 10° W to 358° W (or 2° E), crossing 0° in both axes), with a false-color overlay (cyan, green, yellow, red) showing hematite abundance on the surface.

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