Jaszczakite

jaszczakite

ikunolite

jonassonite

cosalite

Images

Formula: [Bi3S3][AuS2]
Sulphosalt, bismuth- and gold- bearing mineral
Crystal System: Orthorhombic
Specific gravity: 7.237 calculated for the empirical formula
Hardness: 2½ to 3
Streak: Black
Colour: Tin-white
Common impurities: The type material contains considerable Pb replacing Bi
Environments

Igneous environments

Jaszczakite is a relatively new mineral, approved in 2016 and to date (June 2025) reported omly from the type locality

Localities

The type locality, the Alsó-Rózsa adit, Nagybörzsöny, Szob District, Pest County, Hungary, is an abandoned gold deposit. Jaszczakite has been found in a mineralised breccia pipe hosted within calc-alkaline rocks. It is closely associated with arsenopyrite, pyrite, marcasite, sphalerite, chalcopyrite, gold, bismuth, bismuthinite, ikunolite, jonassonite and cosalite, in a matrix of quartz.
Jaszczakite is opaque and tin-white, with a metallic lustre and a black streak (EJM 29.4.673-677, HOM).
Jaszczakite from the Alsó-Rózsa adit - Image

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