hematolite

hematolite

[′he·məd·ō‚līt]
(mineralogy)
(Mn,Mg)4 Al(AsO4)(OH)8 A brownish-red mineral composed of aluminum manganese arsenate; occurs in rhombohedral crystals.
References in periodicals archive ?
Relationship to other species: The crystal structure resembles that of hematolite.
1999) The effect of differences in coordination on ordering of polyvalent cations in close-packed structures: the crystal structure of arakiite and comparison with hematolite.
Arakiite is megascopically indistinguishable from either hematolite or dixenite and possesses the following physical properties: steak is pale brown; lustre is resinous to submetallic; diaphaneity is opaque (masses) to translucent (thin edges); non-fluorescent; hardness is estimated at 3-4; cleavage is {001} perfect; tenacity is brittle; fracture is uneven, almost subconchoidal; calculated density is 3,41 g/[cm.
The crystal structure most closely resembles that of hematolite (Moore and Araki, 1978) rather than that of dixenite (Araki and Moore, 1981) and has been dealt with in a separate publication (Cooper and Hawthorne, 1999).
Araki, in close collaboration with Professor Paul Moore, solved the structures of many complex P-bearing and As-bearing phases, including those of hematolite and dixenite.
552 [dot{A}] are comparable, in both intensity and spacing, to those diffraction lines published for both hematolite and dixenite and, additionally, to the unnamed [Fe.
Full details of the structural similarities and differences between arakiite and hematolite have been published by Cooper and Hawthorne, 1999.
At Nordmark, an iron ore field consisting of several mines with some small manganese orebodies has yielded specimens as well; dump and in situ finds of several interesting minerals have been made, including rare manganese arsenates such as synadelphite, hematolite and allactite in small but attractive micromounts; also filipstadtite, manganostibite, katoptrite and alabandite.