specular hematite

specular hematite

[′spek·yə·lər ′hē·mə‚tīt]
(mineralogy)
A variety of hematite with a blue-gray color and bright metallic luster.
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References in periodicals archive ?
The alteration mapping focuses on mapping zones of carbonate, quartz-carbonate, jasper-hematite, specular hematite, and chloritic alteration.
Specular hematite is commonly present near veins, and pale green sericite-chlorite characterizes the altered wall rocks of the shear zones.
It was particularly rich in crystal-lined cavities containing fine specimens of calcite, dolomite, quartz, specular hematite and "kidney ore" (for which the mine became especially famous).
The College Hill deposit is a laminated BIF with considerable disturbed bedding having associated siltstones and flat-pebble sedimentary breccia cemented by specular hematite. The Hogan Mountain deposit consists of crustiform open space fillings within a rhyolitic breccia, suggesting deposition in a hot spring vent.
The 360-degree design includes debris made of scrap steel, concrete and specular hematite, a glass-like mineral scattered across the base' to represent the wreckage in New York City, Washington, D.C., and Shanksville, PA.
The Vulcan Iron Formation was mined for abundant specular hematite and minor magnetite.
The chargeability of IOCG deposits is influenced in part by the presence of specular hematite. Go Metals has found many similarities between the Carrapateena and the Monster, such as their mineralogy and magnetic response.
In addition to the interbedded fine grained and oolitic ores, some of the iron is present as coarse, crosscutting specular hematite, filling fractures and breccia interstices, and apparently is of late hydrothermal origin.
Associated minerals are calcite and very minor magnussonite, and the bulk of the specimen is specular hematite. 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.sup.3] (for empirical formula and unit-cell parameters derived from crystal structure).
The iron-ore samples included a Michigan magnetite, a martitic hematite, a specular hematite, and a Minnesota taconite.