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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 ...
Mineral symbols (text abbreviations) are used to abbreviate mineral groups, subgroups, and species, just as lettered symbols are used for the chemical elements. The first set of commonly used mineral symbols was published in 1983 and covered the common rock-forming minerals using 192 two- or three-lettered symbols. [ 1 ]
An ancient symbol of the Jewish faith, also found on the Seal of Solomon. Icelandic magical staves: Icelandic magic: Sigils created with magical powers by the Icelandic people. Pictured is the stave known as Ægishjálmur. I'itoi: Uto-Aztecan O'odham peoples of Arizona
Magnetite has been important in understanding the conditions under which rocks form. Magnetite reacts with oxygen to produce hematite, and the mineral pair forms a buffer that can control how oxidizing its environment is (the oxygen fugacity). This buffer is known as the hematite-magnetite or HM buffer.
The total number of distinct Egyptian hieroglyphs increased over time from several hundred in the Middle Kingdom to several thousand during the Ptolemaic Kingdom.. In 1928/1929 Alan Gardiner published an overview of hieroglyphs, Gardiner's sign list, the basic modern standard.
Limonite is named for the Ancient Greek word λειμών (leimṓn [leː.mɔ̌ːn]), meaning "wet meadow", or λίμνη (límnē), meaning "marshy lake", as an allusion to its occurrence as bog iron ore in meadows and marshes. [6] In its brown form, it is sometimes called brown hematite [7] or brown iron ore. [8]
The recession of 2020, was the shortest and steepest in U.S. history and marked the end of 128 months of expansion. Key Predictors, Indicators and Warning Signs
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...