Zlato, křemen
Tři milimetry velký kus krystalického ryzího zlata prorostlý nedokonale omezeným krystalem křemene. Tento vzorek je velkou raritou, kde je zlato […]
Gold
Gold lavishly grown on quartz tinted green by secondary copper minerals. The aggregate at the top of the sample measures […]
Gold, shattuckite
Unusual and very elegant combination of aggregates of pure gold in a contrasting intensely blue Shattuckite of gemstone quality. The […]
Zlato
Jeden a půl milimetru velký agregát zlata v křemenné žíle se sekundárními minerály mědi.
Dyscrasite, arsenic
Silver shiny, bladed crystals of dyskrazite occasionally forming fan-shaped aggregates with matte black arsenic on a white carbonate substrate. The […]
Selenium, sulphur
Černé kovově jehličky selenu s kulovitými agregáty žluté síry. Vzorek pochází z hořící haldy dolu Schöller. Vzorek je možné vyzvednout […]
Gold
A specimen of nativegold from Jílové. It is a 1.5 mm gold nugget in white quartz intergrown with dark telluride, […]
Copper in gypsum
Beautiful dendritic, thin crystals of pure copper in a clear gypsum crystal.
Copper
Native Copper flake.
Gold
Gold flakes in parent rock composed of quartz and pyrite. The largest gold flake is approximately 1 mm in size.
Iron
Polished sample of natural iron formed at the contact of basalt with a coal seam.
Arsenic
Pure arsenic in richly grown, black reniform aggregates.