Cassiterite
Glossy black cassiterite crystals on a quartz matrix with tiny crystals of intense purple fluorite. Both of the largest cassiterite […]
Calcite
Druse of scalenohedral calcite crystals on which younger calcite with prismatic development is growing from one direction.
Goshenite
Two crystals of clear, in some places even transparent, gem-quality beryl. The larger crystal, measuring 4 cm, is naturally damaged […]
Calcite, pyrite
Scalenohedral calcite crystals 2 to 3 cm large overgrown on one side with second-generation calcite with a prismatic habit and […]
Calcite
Scalenohedral calcite crystals up to 2 cm large overgrown by younger, smaller, hypoparallel-grown crystals. The sample is further complemented by […]
Dyskrazit
Stříbrně lesklé plíškovité krystaly antimonidu stříbra. Dyskrazit na vzorku vytváří zdvojčatělé až dendriticky narostlé krystaly. Největší krystal je 2 cm […]
Dyscrasite, arsenic
The complete profile of the vein formed by wire-like crystals of silver Dyskrazit ranging from 2 to 5 mm in […]
Pyrargyrit
Dutina v kalcitu o rozměrech 2 × 1 cm, ve které se nachází srostlice krystalů pyrargyritu a pyritových kuliček. Nejspodnější […]
Germaropyge germari
Historical sample of an almost complete, rare trilobite of the species Germaropyge germari from the classic Barrande locality Pod trním […]
Marcasite
Esthetic twin sprouts of glossy crystals of marcasite. The sample originates from the 1970s.
Ptychoparia striata
Partially twisted trilobite of the species Ptychoparia striata from the classic Barrandian locality Pod trním near Týřovice. The length of […]
Marcasite
Cluster of hoof-shaped twinned, shiny crystals of marcasite. The specimen is from the 1970s.