Sedimentary (Silicified Fossiliferous Chalcedony)

Petrified Wood

Silicified Wood (SiO2)

Quartz-rich breccia (possibly silicified jasper or chalcedony breccia)

Silica breccia composed mainly of microcrystalline quartz (SiO₂), chalcedony, and possibly iron-oxide-stained quartz

Grey chert or siliceous limestone nodule

Microcrystalline quartz (chalcedony), likely with calcite and clay impurities

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of organic matter)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)

Petrified Wood

Silicified Wood (Quartzo-feldspathic fossil wood)

Petrified Wood

Silicified Wood (SiO2)

Ocean Jasper

SiO2 (Silicon Dioxide with impurities)

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of organic matter)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Quartz-rich polymict conglomerate (possibly hydrothermal breccia)

Clast-supported polymict conglomerate dominated by quartz; includes chalcedony/quartz and dark lithic clasts

Fossil Coral

Rugose Coral or Tabulate Coral (Phylum Cnidaria)

Petrified Wood

Silicified Wood / Fossilized Wood (SiO2)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony replacing $SiO_2$)

Quartz-rich chalcedony (likely silicified rock)

Microcrystalline quartz, SiO₂; possibly silicified limestone or jasper

Iron-stained jasper (likely rough jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

Tumbled chert or chalcedony

Microcrystalline quartz (SiO₂), likely chert with a chalcedonic texture

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Limestone

Fossiliferous Limestone

Fossiliferous Limestone

Fossiliferous Limestone

Dinosaur Bone (Gembone)

Silicified Dinosaur Bone (SiO2 replacing organic tissue)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Quartz-rich breccia or silicified rock

Microcrystalline quartz (SiO₂) with iron-oxide staining and darker host-rock fragments

Tumbled banded agate or jasper

Microcrystalline quartz (chalcedony), SiO₂, likely with iron-oxide inclusions

Polished orbicular jasper (likely kambaba jasper)

Kambaba jasper; cryptocrystalline quartz/chalcedony with dark green and gray orbicular aggregates, commonly associated with altered volcanic material

Tumbled fossil-bearing limestone or chert

Microcrystalline calcite (limestone), possibly silicified; fossil fragments visible

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (Permineralized wood)

Weathered brown chert or silicified mudstone

Microcrystalline quartz (chalcedony), SiO₂; possibly a ferruginous silicified sediment

Polished jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

Silicified Gastropod Fossil (Agatized Fossil)

Gastropoda (Class) preserved in Chalcedony/Quartz (SiO2)

Polychrome jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides and other inclusions

Polished petrified wood

Silicified wood, chiefly microcrystalline quartz (SiO₂), often with chalcedony and iron oxides

Rounded chert or silicified limestone pebble

Microcrystalline quartz (chalcedony/chert), possibly replacing limestone; SiO₂

Petrified Wood

Silicified Wood (SiO2)

Fossil Coral

Phylum Cnidaria / Rugosa or Tabulata

Tumbled red jasper

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Yellow jasper (likely iron-rich chert)

Microcrystalline quartz, SiO₂, colored by iron oxides/hydroxides