Geocronite


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Ge`oc´ro`nite


n.1.(Min.) A lead-gray or grayish blue mineral with a metallic luster, consisting of sulphur, antimony, and lead, with a small proportion of arsenic.
References in periodicals archive ?
a sharp, 8-cm geocronite twin from Virgem de Lapa, Brazil.
Geocronite occurs dispersed as metallic, gray, microscopic grains (0.2-0.5 mm) in galena in vuggy siderite in the Andrdssy II and Polyanka sections.
Geocronite is highly variable in habit, but invariably pseudohexagonally twinned.
A report of geocronite, as grains up to 200 microns (Zakrzewski, 1989), gives analyses with As[greater than]Sb so the mineral should actually be jordanite and is listed as such in the table.
(3) Sulfosalt stage: alabandite, marcasite, pyrite, arsenopyrite, quartz, manganaxinite, clinozoisite, stibnite, robinsonite, jamesonite, barite, orpiment, realgar, hutchinsonite, geocronite, native arsenic, seligmannite, Pb-As-S glass ("revoredite," not a true mineral).
Bournonite, geocronite, stibnite, orpiment and realgar are typical of this zone.