Malachite
Dark green shiny malachite crystals up to 7 mm from the Betzdorf, Germany deposit. A historical specimen from this location […]
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 […]
Phosphosiderite, bermanite, hureaulite
Blue grape-like aggregates of Phosphosiderite with ochre balls of Bermanite and pinkish Hureaulite. An interesting example of a phosphate mineral […]
Sanidine
A two-centimeter large twin of sanidine in the parent rock from Karlovy Vary.
Anglesite
Two centimeters long, a shiny crystal of translucent anglesite grown in the cavity of massive galenite.
Smoky Quartz
Fourteen millimeters large, complete crystal of very dark Quartz in white Gypsum .
Gadolinite
Specimen of black massive silicate of beryl and rare earths – gadolinite .
Prismatine
Columnar crystals of grey, very rare borosilicate prismatine (described only in 9 locations) in a white to beige talc.
Hessonite, aquamarine
Unusuall combination of hessonite garnet and aquamarine
Cuprite
Cubes of dark metal-shiny cuprite octahedra. The largest crystal is 2 cm large.