Rock Identifier

Category

Sedimentary (Silicified Fossiliferous Chalcedony)

Browse sedimentary (silicified fossiliferous chalcedony) specimens identified by the Rock Identifier community.

Learn about Sedimentary (Silicified Fossiliferous Chalcedony) in the encyclopedia

Fossiliferous Limestone

Fossiliferous Limestone

Chalcedony

Chrome Chalcedony

Chrome Chalcedony

Blue Chalcedony

Blue Chalcedony

Silcrete

Opalized Wood

Shelly Limestone

Shelly Limestone

Petrified Wood

Conglomerate

Gem Silica

Mookaite

Chrysoprase

Tiger's Eye (Blue/Black variety, also known as Hawk's Eye) (Silicified Crocidolite (Silicon Dioxide with inclusions, SiO2)) — metamorphic

Tiger's Eye (Blue/Black variety, also known as Hawk's Eye)

Silicified Crocidolite (Silicon Dioxide with inclusions, SiO2)

Petrified Wood (Silicified wood (primarily Silicon Dioxide, SiO2)) — metamorphic

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Petrified Wood (Silicified Wood (primarily SiO₂ - Silicon Dioxide)) — metamorphic

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)

Blue Tiger's Eye (Crocidolite (fibrous riebeckite) silicified to Quartz (SiO2)) — Mineral

Blue Tiger's Eye

Crocidolite (fibrous riebeckite) silicified to Quartz (SiO2)

Petrified Wood (Silicified Wood (primarily Silicon Dioxide, SiO2)) — mineral

Petrified Wood

Silicified Wood (primarily Silicon Dioxide, SiO2)

Jasper (specifically Polychrome or Desert Jasper) (Silicon Dioxide (SiO2) with iron oxide and other mineral impurities) — sedimentary (chemical/biological origin)

Jasper (specifically Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with iron oxide and other mineral impurities

sedimentary (chemical/biological origin)

Carnelian (Carnelian Chalcedony (SiO2 with iron oxide impurities)) — mineral

Carnelian

Carnelian Chalcedony (SiO2 with iron oxide impurities)

Fossilized echinoid (sea urchin), likely a flint/chalk-associated test (Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)) — fossil

Fossilized echinoid (sea urchin), likely a flint/chalk-associated test

Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)

Quartz (Microcrystalline/Agate) (Silicon Dioxide (SiO2)) — mineral

Quartz (Microcrystalline/Agate)

Silicon Dioxide (SiO2)

Jasper (Silicon Dioxide (SiO2) with iron oxide impurities) — sedimentary

Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Chert (and Flint) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (and Flint)

Cryptocrystalline Quartz (SiO2)

Chert (or Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (or Flint)

Microcrystalline Quartz (SiO2)

Septarian Nodule (Thunder Egg) (Septarian Concretion (CaCO3 + CaMg(CO3)2 + SiO2)) — sedimentary

Septarian Nodule (Thunder Egg)

Septarian Concretion (CaCO3 + CaMg(CO3)2 + SiO2)

Polished orbicular jasper (likely ocean jasper) (Silicified volcanic rock; chiefly microcrystalline quartz (SiO₂), with feldspar and iron-rich alteration minerals) — sedimentary

Polished orbicular jasper (likely ocean jasper)

Silicified volcanic rock; chiefly microcrystalline quartz (SiO₂), with feldspar and iron-rich alteration minerals

Quartz (Iron-stained or Chalcedony varieties) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained or Chalcedony varieties)

Silicon Dioxide (SiO2)

White Agate (Chalcedony) (Silicon Dioxide (SiO2)) — mineral

White Agate (Chalcedony)

Silicon Dioxide (SiO2)

Druzy Quartz Geode (Partially Open) (Silicon Dioxide (SiO2) within Sedimentary Host Rock) — sedimentary

Druzy Quartz Geode (Partially Open)

Silicon Dioxide (SiO2) within Sedimentary Host Rock

Carnelian (Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)) — mineral

Carnelian

Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)

Quartz / Chert (Silicon Dioxide (SiO2)) — Mineral / Sedimentary

Quartz / Chert

Silicon Dioxide (SiO2)

Mineral / Sedimentary

Tumbled jasper pebble (Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities) — mineral

Tumbled jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Chert (Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)) — sedimentary

Chert

Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)

Dark gray chert or flint nodule (Microcrystalline quartz (SiO₂), commonly chalcedony/quartz) — sedimentary

Dark gray chert or flint nodule

Microcrystalline quartz (SiO₂), commonly chalcedony/quartz

Zebra Jasper (Tainted Silicate (mainly Quartz/Chalcedony/Calcite)) — sedimentary

Zebra Jasper

Tainted Silicate (mainly Quartz/Chalcedony/Calcite)

Fairburn Agate (Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz) — sedimentary

Fairburn Agate

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Geode (Unopened) (SiO2 (Silicon Dioxide) - Chalcedony/Quartz Geode) — sedimentary

Geode (Unopened)

SiO2 (Silicon Dioxide) - Chalcedony/Quartz Geode

Picture Jasper (Silicon Dioxide (SiO2) - Opaque Impure Chalcedony) — sedimentary

Picture Jasper

Silicon Dioxide (SiO2) - Opaque Impure Chalcedony

Montana Moss Agate (Chalcedony (SiO2) with Manganese/Iron oxide inclusions) — sedimentary

Montana Moss Agate

Chalcedony (SiO2) with Manganese/Iron oxide inclusions

Black Jasper (Black Stone / River Pebble) (Silicon Dioxide (SiO₂), Opaque variety of Chalcedony) — sedimentary

Black Jasper (Black Stone / River Pebble)

Silicon Dioxide (SiO₂), Opaque variety of Chalcedony

Carnelian (Silicon Dioxide (Quartz variety, SiO2)) — mineral

Carnelian

Silicon Dioxide (Quartz variety, SiO2)

Quartz Pebble (River Agate / Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (River Agate / Chalcedony)

Silicon Dioxide (SiO2)

Banded Calcite (often sold as 'Mexican Onyx') (Calcite (Calcium Carbonate, CaCO3)) — Mineral / Sedimentary Rock

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate, CaCO3)

Mineral / Sedimentary Rock

Jasper Agate (specifically Brecciated Jasper with Agate inclusions) (Silicon Dioxide (SiO2)) — mineral

Jasper Agate (specifically Brecciated Jasper with Agate inclusions)

Silicon Dioxide (SiO2)

Carnelian (Carnelian (Silicon Dioxide: SiO2)) — mineral

Carnelian

Carnelian (Silicon Dioxide: SiO2)

Green Moss Agate (Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite) — sedimentary

Green Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

White quartz geode (Quartz, silicon dioxide (SiO₂), likely a druzy quartz geode) — mineral

White quartz geode

Quartz, silicon dioxide (SiO₂), likely a druzy quartz geode

Agate Geode Slice (with Druzy Quartz) (Silicon Dioxide (SiO2)) — mineral

Agate Geode Slice (with Druzy Quartz)

Silicon Dioxide (SiO2)

Agate (Chalcedony (SiO2)) — mineral

Agate

Chalcedony (SiO2)

Agate (Chalcedony (SiO2)) — gemstone

Agate

Chalcedony (SiO2)

Black Onyx (Chalcedony (SiO2)) — gemstone

Black Onyx

Chalcedony (SiO2)

Black Onyx (Chalcedony (SiO2)) — gemstone

Black Onyx

Chalcedony (SiO2)

Black Onyx (Chalcedony (SiO2)) — gemstone

Black Onyx

Chalcedony (SiO2)

Tree Agate (Chalcedony (SiO2)) — gemstone

Tree Agate

Chalcedony (SiO2)