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Small, loose hematite spherules on soils about 500 m northwest of Victoria Crater. In this image, most spherules have 1 - 2 mm diameters. A few have diameters under 1 mm, and the largest is 2.5 mm x 4 mm. Image taken on Sol 910 (2004-08-15).
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 ...
A Carved Gold Dust Faturan Prayer Bead Strand made from North African Tribal Beads. In the bead trade, "Faturan" is thought to be a mixture of natural amber shavings with other materials, and is described as having been invented in the Middle East in the 18th or 19th century, however, there is some dispute over this within the trade.
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Hematine ring. Hematine (also magnetic hematite, hemalyke or hemalike) is an artificial magnetic material. [1] Hematine is widely used in jewelry. [citation needed]Although it is claimed by many that it is made from ground hematite or iron oxide mixed with a resin, analysis (of one object) has demonstrated it to be an entirely artificial compound, a barium-strontium ferrite.
Considering buffering the redox potential (E h) in the Fe–O redox system, this can be compared to buffering the pH in the H + /OH − acid–base system of water. Once the Fe 3+ is consumed, then oxygen must be stripped from the system to further reduce it and wüstite is converted to native iron. The oxide mineral equilibrium assemblage of ...
O 2 + 4FeCO 3 → 2Fe 2 O 3 (hematite) + 4CO 2 E = −346 kJ/mol Secondary red beds formed in this way are an excellent example of telodiagenesis . They are linked to the uplift , erosion and surface weathering of previously deposited sediments and require conditions similar to primary and diagenetic red beds for their formation.
Maghemite (Fe 2 O 3, γ-Fe 2 O 3) is a member of the family of iron oxides.It has the same formula as hematite, but the same spinel ferrite structure as magnetite (Fe 3 O 4) and is also ferrimagnetic.
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