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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 ...
Medieval or early modern lapidaries describe particular gemstones' protective and healing properties, including diamond, emerald, sapphire, amethyst, ruby, etc.Some of the stones mentioned are metals or metallic compounds such as cinnabar, hematite, calamine, and magnetite.
The "classic" bloodstone is translucent to opaque green chalcedony and red jasper that contains inclusions of hematite. The red jasper may resemble spots of blood, hence the name bloodstone. Other colors of chalcedony may also occur in Indian bloodstone, such as white, yellow, or blue.
It can be prepared by reduction of hematite by carbon, [clarification needed] pyrolysis of iron(III) chloride solution, or thermal decomposition of iron(III) sulfate. [ 13 ] The epsilon (ε) phase is rhombic, and shows properties intermediate between alpha and gamma, and may have useful magnetic properties applicable for purposes such as high ...
Only a few oxides are significant at the earth's surface, particularly wüstite, magnetite, and hematite. Oxides of Fe II. FeO: iron(II) oxide, wüstite; Mixed oxides of Fe II and Fe III. Fe 3 O 4: Iron(II,III) oxide, magnetite; Fe 4 O 5 [2] Fe 5 O 6 [3] Fe 5 O 7 [4] Fe 25 O 32 [4] Fe 13 O 19 [5] Oxides of Fe III. Fe 2 O 3: iron(III) oxide. α ...
The iron content of taconite is generally 30% to 35%, and the silica content generally around 45%. Iron in taconite is commonly present as magnetite, iron silicates, and iron-bearing carbonates, and locally martite (hematite) formed by oxidation of magnetite.
Rainbow lattice sunstone with hematite and magnetite equilateral triangle inclusions. Initially, the study of this gemstone in 1989 concluded that the inclusions were made up of ilmenite (for the iridescence lattice and black triangles) and hematite (for the orange platelets). [3]
Magnetic therapy is a pseudoscientific alternative medicine practice involving the weak static magnetic field produced by a permanent magnet which is placed on the body. It is similar to the alternative medicine practice of electromagnetic therapy, which uses a magnetic field generated by an electrically powered device. [1]
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