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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 ...
[9] [37] [13] [14] (The dry area around Utah's Great Salt Lake is a playa.) McLennan and his students constructed a geochemical model that generates hematite within a context like the Meridiani sediment. [13] [14] [38] [39] The hematite formed into spherules by concretion (when minerals came out of solution).
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.
It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO), which is rare; and iron(II,III) oxide (Fe 3 O 4), which also occurs naturally as the mineral magnetite. Iron(III) oxide is often called rust , since rust shares several properties and has a similar composition; however, in chemistry, rust is considered an ill ...
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.
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.