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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.
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 ...
This exchange value of 97.5 piastres to the pound sterling continued until the early 1960s when Egypt devalued slightly and switched to a peg to the United States dollar, at a rate of E£1 = US$2.3. The Egyptian pound continued with its exchange rate of £E = £1 0s 6d sterling until the beginning of the 1960s.
A three-member consortium signed cooperation protocol with Egyptian government to establish a US$35–50m worth electronic Egyptian Commodities Exchange in Egypt as the first ever country in the MENA region; it will facilitate the well-being of the small farmers and supply of products at reasonable prices abolishing the monopoly of goods. [5] [6]
Ion-exchange resin beads. An ion-exchange resin or ion-exchange polymer is a resin or polymer that acts as a medium for ion exchange, that is also known as an ionex. [1] It is an insoluble matrix (or support structure) normally in the form of small (0.25–1.43 mm radius) microbeads, usually white or yellowish, fabricated from an organic polymer substrate.
With the outbreak of World War I, Egypt abandoned the gold standard and pegged its currency to the British pound at a fixed rate, which remained until 1962 when it shifted to the U.S. dollar. [67] In 1969, Egypt adopted a multiple exchange rate system to address two key challenges. [68]
Shell money usually consisted of whole or partial sea shells, often worked into beads or otherwise shaped. The use of shells in trade began as direct commodity exchange, the shells having use-value as body ornamentation. The distinction between beads as commodities and beads as money has been the subject of debate among economic anthropologists ...
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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