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
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
Back to Minerals