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Lepidocrocite (γ-FeO(OH)), also called esmeraldite or hydrohematite, is an iron oxide-hydroxide mineral. Lepidocrocite has an orthorhombic crystal structure, a hardness of 5, specific gravity of 4, a submetallic luster and a yellow-brown streak. It is red to reddish brown and forms when iron-containing substances rust underwater.
Lepidolite is a lilac-gray or rose-colored member of the mica group of minerals with chemical formula K(Li,Al) 3 (Al,Si,Rb) 4 O 10 (F,OH) 2. [2] [3] It is the most abundant lithium-bearing mineral [4] and is a secondary source of this metal.
The minerals within this soil are goethite, lepidocrocite, and hematite. [22] In recognition of the weathering process that these minerals require, they are classified as rare earth minerals. [23] In addition to these rare minerals other elements are contained within this soil like substance such as iron and nickel. [24]
This category lists minerals that display the Cmcm (No. 63) space group symmetry of the orthorhombic crystal system. This also includes Amam , Amma , Bbmm , and Bmmb . Pages in category "Minerals in space group 63"
The crystal structure of β-FeOOH (akaganeite) is that of hollandite or BaMn 8 O 16. The unit cell is tetragonal with a = 1.048 and c = 0.3023 nm, and contains eight formula units of FeOOH. Its dimensions are about 500 × 50 × 50 nm. Twinning often produces particles with the shape of hexagonal stars. [2]
The space group R 3 m was determined for segnitite as the best fit based on the space group of beudantite, R3m [5] as there is no well observed crystal structure. The difference between segnitite and beundantite is the replacement of the sulfate anion in beundantite with an arsenate anion to form segnitite.
This page was last edited on 19 October 2021, at 19:45 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Maghemite can also form through dehydration and transformation of certain iron oxyhydroxide minerals, such as lepidocrocite and ferrihydrite. It occurs as widespread brown or yellow pigment in terrestrial sediments and soils. It is associated with magnetite, ilmenite, anatase, pyrite, marcasite, lepidocrocite and goethite. [3]
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