JBeauAuditore
326
6
2
Possibly Emerald?
Calcite & chalcopyrite
Kevlandite
Amethyst
Quartz w/ Hematite
Quartz
Citrine
Amethyst
Quartz
Thunderegg with Heulandite
Garnets in Schist
Quartz Geode
Ammonite
Thunderegg
Pyrite
Calcite
Magnetite
Smokey Quartz
Coral
Coral back side
Petrified wood
Smokey Quartz
Selenite
Pelecypod
Petrified wood
Chalcopyrite on limestone
Fluorite
Quartz Geode
Fossil snails
Teeth
Barite
Amethyst
Epidote and Quartz
Amethyst
Calcite
Epidote with Quartz
horseman05
venomlash
#13 I strongly suspect it's been infilled but not replaced by calcite spar, and the "opal" on the back is actually original nacre.
venomlash
#31 fun fact: the snails in "Turritella agate" are actually Elimia tenera. There was a mixup at first and the name just stuck.