tetrahedrite


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Related to tetrahedrite: Tennantite

tetrahedrite

[‚te·trə′hē‚drīt]
(mineralogy)
(Cu,Fe,Zn,Ag)12Sb4S13 A grayish-black mineral crystallizing in the isometric system as tetrahedrons and occurring in massive or granular form; luster is metallic, hardness is 3.5-4 on Mohs scale, and specific gravity is 4.6-5.1; an important ore of copper. Also known as fahlore; gray copper ore; panabase; stylotypite.
References in periodicals archive ?
The principal Ag mineral is tetrahedrite (called 'grey copper' by prospectors), which is ubiquitous throughout the camp.
Although assay results examining copper values have only been received so far for one drill hole, the Company expects further positive copper values based on the amounts of chalcopyrite and tetrahedrite observed in the drill core.
Mineralization intercepted in the drilling is consistent with the current resource model and is associated with a sequence of quartz porphyritic, rhyolitic lapilli tuffs and basaltic tuffs and argillite hosting disseminations, stringers and semi-massive intervals of pyrite, sphalerite, galena, tetrahedrite, pyrrotite and chalcopyrite.
Chalcopyrite, tetrahedrite, and covellite are copper-bearing minerals; tetrahedrite is also a silver-bearing mineral; galena is a lead-bearing mineral; and sphalerite is a zinc-bearing mineral).
The copper oxides malachite and azurite are also observed locally, and most typically appear to mark the presence of tetrahedrite in the veins.
Sulphide vein mineralization consists of pyrite, arsenopyrite, sphalerite, galena, chalcopyrite and tetrahedrite within limestone, intrusive and skarn host rocks.
Based on previous metallurgical tests on representative vein material, recovery rates between 90 to 95 per cent from Ag and Cu bearing tetrahedrite are anticipated.
At the base of this alunite layer semi-oxidized tetrahedrite and enargite with associated arsenic oxide were located near a 770 ppb gold-in-soil anomaly.
Mineralization occurs in propylitic altered andesitic rocks, and consists of galena, pyrite, sphalerite, tetrahedrite and chalcopyrite.
Tetrahedrite mineralisation was emplaced into a complicated system of fractures developed along the margins of quartz ladder veins and within siderite during late stages of brittle deformation.