Benitoit
Velmi bohatá ukázka tmavě modrých, průsvitných krystalů velmi vzácného silikátu barya a titanu – benitoitu z typové lokality. Největší krystal […]
Tugtupite
Pink grains of the rare silicate beryl – tugtupite with the ability of so-called tenebrescence (changes color temporarily after exposure […]
Tugtupite
A pink grain (about 8 mm in size) of the rare silicate beryllium – tugtupite with the ability of so-called […]
Ludwigite
A larger massive sample composed mostly of fibrous radiating black ludwigite. Ludwigite is a relatively uncommon borate of iron and […]
Ludwigite
A massive specimen composed largely of fibrous radially divergent black ludwigite. Ludwigite is a relatively rare iron and magnesium borate. […]
Sylvanite
Several silvery shiny laths of the rare Sylvanite up to 5 mm in size from the type locality Baia de […]
Hydrocerussite, lead
Millerite
Nickel sulfide needles from the 5th floor of the Prokop vein.
Diaforite
An extremely large (13 millimeters long), crystal of the rare silver sulfosalt – diaphorite. The crystal is incomplete on the […]
Sternbergit
Metallic, bronze-looking Sternbergite crystals on a massive Proustit. The largest crystal is about 0.5 mm big. Jáchymov is the type […]
Xanthoconite, sternbergite, proustite
A mineralogically very interesting combination of intense red proustit crystals with rare orange Xanthoconite and black shiny plates of Sternbergite. […]
Zeophyllite
Three centimeters large cavity filled with fan-like aggregates of pearly lustrous Zeofylit. Velké Březno is the type locality for Zeofylit.
