Spurrite
Massive sample composed almost exclusively of lightly bluish spurrite, a very rare calcium silicate with a CO3 group from high-temperature […]
Ludwigite
A larger massive sample composed mostly of fibrous radiating black ludwigite. Ludwigite is a relatively uncommon borate of iron and […]
Sylvanite
Several silvery shiny laths of the rare Sylvanite up to 5 mm in size from the type locality Baia de […]
Lindströmite
Silvery granular aggregates of a rare sulfide from the aikinite-bismutinite series from the Baita locality. The specimen was analyzed .
Quartz
Great druse of white quartz crystals sprinkled with pyrite.
Chalcopyrite
Beautiful smoky quartz crystals closely associated with chalcopyrite from the well-known Romanian locality Cavnic .
Nagyagite, arsenic
Slatted, shiny, approximately 0.5 cm large crystals of the rare gold sulfotelluride nagyagite from the type locality. The nagyagite crystals […]
Gold
A richly grown specimen of native gold with wire development in white quartz. The dimensions of the largest visible piece […]
Zlato
Estetický vzorek plíšků dendriticky narostlého zlata s drobnými krystalky křemene z klasické rumunské lokality.
Boulangerite, calcite
Double-sided specimen of white calcite crystals on one side densely covered with fibrous crystals of boulangerite.
Crystal, pyrite, dolomite
Druze of perfectly developed aesthetically arranged white to clear quartz – crystal crystals about 4 cm in size, which are […]
Quartz, pyrite
A very aesthetic larger druse of quartz crystals, on which perfectly limited pyrite crystals are seated. The sample comes from […]