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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.
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.
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A shebyu collar of faience beads from the burial of Amenhotep. The shebyu collar is an ancient Egyptian necklace composed of one or more strands of disc beads. Collars specifically called shebyu by the ancient Egyptians are the two-stranded kind given to officials as part of a royal reward. However, the term is used in Egyptology to refer to ...
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 ...
Variscite has been used in Europe to make personal ornaments, especially beads, since Neolithic times. Its use continued during the Bronze Age and in Roman times although it was not until the 19th century that it was determined that all variscite used in Europe came from three sites in Spain, Gavá (Barcelona), Palazuelo de las Cuevas (Zamora), and Encinasola (Huelva).