Sedimentary (Silicified Fossiliferous Chalcedony)

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Flaked stone projectile point

Likely worked chert or fine-grained silicified shale; exact lithology cannot be confirmed from the image

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Petrified Wood

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Jasper (likely brecciated or silicified jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

Turritella Gastropod Fossil

Turritella (mollusk fossil in sedimentary matrix)

Banded chert or silicified sedimentary stone

Microcrystalline quartz (chalcedony), SiO₂, possibly with iron-oxide and clay impurities

Fossil Coral

Scleractinia (Fossilized Hexacoral)

Petrified Wood

Silicified Wood (mainly Quartz/Chalcedony, SiO2)

Blue-gray chalcedony or quartz-rich rock

Microcrystalline quartz, SiO₂; possibly silicified host rock

Petrified Wood

Fossilized Wood (SiO2 replacing organic matter)

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of cellulose)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Fossiliferous limestone, likely with a coral or stromatoporoid fossil

Calcite (CaCO₃) limestone containing fossilized marine skeletal material

Kambaba Jasper

Stromatolite (Microbial mat fossil in silicified sediment)

Flint / Chert (or fossiliferous nodule)

Microcrystalline quartz (SiO2)

Banded chert or silicified sedimentary rock

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral bands

Polished jasper or chert

Microcrystalline quartz (SiO₂), likely iron-stained jasper/chalcedony

Red Jasper (with Quartz inclusion)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Petrified Wood / Fossilized Wood

Silicified Wood (Silicon Dioxide - SiO2)

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Banded agate (likely petrified wood or silicified sediment)

Microcrystalline quartz/chalcedony, SiO₂; possible silicified wood

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Banded chert or siliceous mudstone

Microcrystalline quartz (chalcedony), SiO₂; possibly ferruginous shale

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Weathered chert or chalcedony nodule

Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony

Weathered chert or flint nodule

Microcrystalline quartz (SiO₂), commonly chalcedony/quartz

Petrified Wood

Silicified Wood (SiO2)

Chert or flint fragment

Microcrystalline quartz (SiO₂), often with chalcedony

Petrified Wood (Black / Carbonized)

Silicon Dioxide (Quartz/Chalcedony replacing Organic Matter)

Yellow chalcedony (likely common yellow jasper or waxy quartz)

Microcrystalline quartz, SiO₂; likely chalcedony with iron-oxide or other coloring impurities

Crinoid Stem Fossil (in matrix)

Crinoid (Class Crinoidea)

Petrified Wood

Silicified Wood / Chalcedony (SiO2)

Iron-stained quartz-rich rock, possibly jasperized quartz or quartzite

Mostly SiO₂ quartz with iron oxides/hydroxides (hematite, goethite) and possible clay or feldspar impurities

Jasper (Red/Yellow)

Silicon Dioxide (SiO2) with impurities

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Petrified Wood

Silicified Wood (Silicon Dioxide - SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Petrified Wood / Fossilized Bone

Silicified / Mineralized Fossil (Silica SiO2)

Petrified Wood

Silicified Wood (SiO2)