Sedimentary (Silicified Fossiliferous Chalcedony)

Weathered limestone fragment

Limestone, predominantly calcite (CaCO₃)

Coquina

Biogenic calcarenite / Coquina (CaCO3)

Fossiliferous Limestone

Fossiliferous Limestone (CaCO3 with organic inclusions)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Organic Inclusions

Fossiliferous Limestone

Limestone (Calcium Carbonate) with Fossil Inclusions

Fossiliferous limestone

Bioclastic calcarenite/calcirudite, predominantly calcite (CaCO₃)

Petrified Wood

Silicified Wood (SiO2)

Fossilized wood (petrified wood)

Silicified fossil wood; commonly quartz/chalcedony (SiO₂) replacing wood

Bivalve Fossil in Sedimentary Matrix

Fossiliferous Mudstone (Class: Bivalvia)

Fossil bivalve impression in chert or siliceous limestone

Likely fossilized bivalve mold/cast; host possibly silicified limestone or chert

Polished pietersite-like brecciated jasper

Silicified chalcedony/jasper aggregate, primarily SiO₂; exact material uncertain from image

Fossiliferous conglomerate

Bioclastic, carbonate-cemented conglomerate (likely limestone matrix)

Fossiliferous Limestone

Biogenic Sedimentary Rock (primarily CaCO3)

Fossiliferous Limestone

Biomicrite / Fossiliferous Limestone (CaCO3)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of Cellulose)

Petrified Wood

Silicified Wood (SiO2 - Quartz/Chalcedony replacement)

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Fossiliferous Limestone

CaCO3 (with biological inclusions)

Fossiliferous Limestone

Bioclastic Limestone (CaCO3)

Limestone with Fossil Fragments

Bioclastic Limestone (CaCO3)

Fossiliferous Chert

Silicon Dioxide (SiO2) with fossil inclusions

Fossiliferous limestone

Calcite-rich limestone (CaCO₃), containing possible fossil or peloidal inclusions

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Biogenic Inclusions

Mookaite Jasper

Silicified Radiolarite (SiO2)

Weathered quartz-rich rock, possibly silicified volcanic rock

Likely quartz (SiO₂) with iron-oxide staining; host may be altered rhyolite or andesite

Petrified Wood

Silicified wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Polished picture jasper slab

Silicified/lithified microcrystalline quartz (chalcedony), commonly with iron-oxide and clay-mineral bands

Fossiliferous limestone

Bioclastic calcitic limestone (predominantly CaCO₃)

Fossiliferous Flint / Chert

Microcrystalline quartz (SiO2) with embedded invertebrate fossils

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous limestone

Calcitic limestone, primarily CaCO₃ (calcite), with visible fossil fragments

Fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃), containing marine shell or coral fossils

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Polished brecciated jasper with druzy quartz

Silicified breccia; primarily microcrystalline quartz/chalcedony (SiO₂), with iron oxides and possible drusy quartz

Polished fossilized wood

Silicified wood (petrified wood), commonly quartz/chalcedony replacing wood

Orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz/chalcedony with orbicular patterns; SiO₂

Sandstone (Ferruginous Concretion)

Arenite (with iron oxide cement)

Shark Tooth Fossil

Chondrichthyes (class) fossilized tooth

Fossiliferous Limestone

Limestone (Calcium Carbonate - CaCO3)