Petr Hykš:
Quartz and hematite coated by grape chalcedony
Petr Hykš:
Quartz and hematite coated by grape chalcedony
Petr Hykš:
Quartz and hematite coated by grape chalcedony
Petr Hykš:
Quartz and hematite coated by grape chalcedony
Petr Hykš:
Opal & chalcedony
Petr Hykš:
Opal & chalcedony
Petr Hykš:
Rudice-type geode
Petr Hykš:
Quartz, var. chalcedony (micro-capture, 30x)
Petr Hykš:
Agate
Petr Hykš:
Agate (as found)
Petr Hykš:
Agate (as found)
Petr Hykš:
Chalcedony (as found)
Petr Hykš:
Agate (as found)
Petr Hykš:
Agate (as found)
Petr Hykš:
Agate (as found)
Petr Hykš:
Agate (as found)
Petr Hykš:
Chalcedony (as found)
Petr Hykš:
Agate (as found)
Petr Hykš:
Agate (as found)
Petr Hykš:
Agate (as found)
Petr Hykš:
Agate (as found)
Petr Hykš:
Agate (as found)
Petr Hykš:
Agate (as found)
Petr Hykš:
Chalcedony (as found)
Petr Hykš:
Agate (as found)
Petr Hykš:
Jasper
Petr Hykš:
a38
Petr Hykš:
a37
Petr Hykš:
a31
Petr Hykš:
a32
