Petr Hykš:
Doubravice quarry
Petr Hykš:
Quartz & secondary calcite geode in permian vulcanite
Petr Hykš:
Quartz & secondary calcite geode in permian vulcanite
Petr Hykš:
Quartz & secondary calcite geode
Petr Hykš:
Quartz & secondary calcite geode
Petr Hykš:
Chrysocolla
Petr Hykš:
Amygdaloidal permian vulcanite
Petr Hykš:
Amygdaloidal permian vulcanite
Petr Hykš:
Chalcedony layers & quartz crystals filled amygdaloidal permian vulcanite
Petr Hykš:
Agates in permian vulcanite
Petr Hykš:
Amygdaloidal permian vulcanite
Petr Hykš:
Beautiful agate (as found)
Petr Hykš:
Agate
Petr Hykš:
Amethyst
Petr Hykš:
Magmatic rocks, very old lava flows