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  2. Hematite - Wikipedia

    en.wikipedia.org/wiki/Hematite

    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

  3. Corundum - Wikipedia

    en.wikipedia.org/wiki/Corundum

    Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium, and chromium. [3] [4] It is a rock-forming mineral.It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [7]

  4. Hematine - Wikipedia

    en.wikipedia.org/wiki/Hematine

    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.

  5. Heliotrope (mineral) - Wikipedia

    en.wikipedia.org/wiki/Heliotrope_(mineral)

    The Gnostics wore the stone as an amulet for longevity, for wealth and courage, to strengthen the stomach, and to dispel melancholy. [6] In the Middle Ages it was considered useful for animal husbandry. [6] The ancient Greeks and Romans wore the stone to bring renown and favor, to bring endurance, and as a charm against the bite of venomous ...

  6. Composition of the human body - Wikipedia

    en.wikipedia.org/wiki/Composition_of_the_human_body

    Parts-per-million cube of relative abundance by mass of elements in an average adult human body down to 1 ppm. About 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium ...

  7. Magnetic mineralogy - Wikipedia

    en.wikipedia.org/wiki/Magnetic_mineralogy

    Another series, the titanohematites, have hematite and ilmenite as their end members, and so are also called hemoilmenites. [1] The crystal structure of hematite is trigonal-hexagonal. It has the same composition as maghemite; to distinguish between them, their chemical formulae are generally given as γ Fe 2 O 3 for hematite and α Fe 2 O 3 ...

  8. Starbucks strike shuts down hundreds of locations - AOL

    www.aol.com/starbucks-strike-expand-more-300...

    A walkout by baristas at Starbucks expanded on Tuesday, as more workers joined at five-day labor action against the coffee giant in a protest that comes to a close later in the day.

  9. Botryoidal - Wikipedia

    en.wikipedia.org/wiki/Botryoidal

    Botryoidal habit of gibbsite crystals. A botryoidal (/ ˌ b ɒ t r i ˈ ɔɪ d əl / BOT-ree-OY-dəl) texture or mineral habit, is one in which the mineral has an external form composed of many rounded segments, named for the Ancient Greek βότρυς (bótrus), meaning "a bunch of grapes". [1]

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