Cassiterite
Glossy black cassiterite crystals on a quartz matrix with tiny crystals of intense purple fluorite. Both of the largest cassiterite […]
Precious opal
Very nicely colored precious opal measuring 12 × 10 mm.
Cuprite
Cubes of dark metal-shiny cuprite octahedra. The largest crystal is 2 cm large.
Cuprite (chalcotrichite)
Historical specimen of a growth of ruby-red cuprite approximately 2 × 1 cm in size .
Ferruginous quartz
A polished specimen of yellow ferrous quartz with gray-green stars. At this locality, ferrous quartzes were not too abundant .
Samarskite
Black resinous shiny streaks of yttrium and niobium oxide in pegmatite. The largest samarskite is 1 cm in size.
Ilsemannite
Blue coatings of the rare molybdenum oxide grown on an open fissure of granulite .
Goethit, záhněda
Dutina v příbramské žílovině porostlá hnědým goethitem s krystaly světlé záhnědy.
Goethite - Sametka .
Velvety lustrous goethite covered by white calcite crystals.
Železitý křemen
Leštěný vzorek nádherně červeného železitého křemene se žlutými proužky.
Pyrite, crystal, galena
Golden pyrite crystals up to 1 cm in size with dark gray galena crystals and small quartz crystals.
Specularite “alpine rose”
Cluster of black tabular hematite crystals sometimes called “Alpine rose” with a pinkish crystal.