Petr Hykš:
Agate
Petr Hykš:
Oco agate
Petr Hykš:
Oco agate
Petr Hykš:
Oco agate
Petr Hykš:
Libethenite in quartz (as bought)
Petr Hykš:
Czech agate
Petr Hykš:
Brazilian agate
Petr Hykš:
Azurite
Petr Hykš:
Labradorescence detail
Petr Hykš:
Labradorite
Petr Hykš:
Gypsum crystal
Petr Hykš:
Gypsum, terminated crystal
Petr Hykš:
Gypsum, terminated crystal
Petr Hykš:
Vanadinite Pb5(VO4)3Cl & Barite (BaSO4)
Petr Hykš:
Vanadinite Pb5(VO4)3Cl & Barite (BaSO4) (stacked)
Petr Hykš:
Labradorescence