Rock Identifier

Category

Sedimentary Rock (Technically Chert, A Microcrystalline Quartz)

Browse sedimentary rock (technically chert, a microcrystalline quartz) specimens identified by the Rock Identifier community.

Geode (Unopened) (Silica-rich Concretion (primarily SiO2)) — sedimentary

Geode (Unopened)

Silica-rich Concretion (primarily SiO2)

Ferruginous Sandstone (Gerrit) (Arenite with Iron Oxide cementation) — sedimentary

Ferruginous Sandstone (Gerrit)

Arenite with Iron Oxide cementation

Quartz (Silicon dioxide (SiO₂)) — Mineral

Quartz

Silicon dioxide (SiO₂)

Ironstone Concretion (Siderite or Limonite Concretion) — sedimentary

Ironstone Concretion

Siderite or Limonite Concretion

Jasper (Silicon Dioxide (SiO2)) — sedimentary

Jasper

Silicon Dioxide (SiO2)

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

Red Jasper (Jasper (Silica/Microcrystalline Quartz with Hematite inclusions), SiO2) — sedimentary

Red Jasper

Jasper (Silica/Microcrystalline Quartz with Hematite inclusions), SiO2

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Greywacke (River Pebble) (Greywacke sandstone with quartz veining) — sedimentary

Greywacke (River Pebble)

Greywacke sandstone with quartz veining

Vuggy Quartz on Matrix (Silicon Dioxide (SiO2)) — mineral

Vuggy Quartz on Matrix

Silicon Dioxide (SiO2)

Tumbled Carnelian and Quartz Mix (Silicon Dioxide (SiO2) with iron oxide impurities) — mineral

Tumbled Carnelian and Quartz Mix

Silicon Dioxide (SiO2) with iron oxide impurities

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

Chalcedony (Grey/White Agate)

Silicon Dioxide (SiO₂)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Jasper with Dendritic Inclusions (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Jasper with Dendritic Inclusions

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Picture Jasper (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Picture Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper Pebble (Tumbled Jasper (Microcrystalline Quartz, SiO2)) — sedimentary

Jasper Pebble

Tumbled Jasper (Microcrystalline Quartz, SiO2)

Sandstone (specifically Arkose or Ferruginous Sandstone) (Sandstone (SiO2 with iron oxide inclusions)) — sedimentary

Sandstone (specifically Arkose or Ferruginous Sandstone)

Sandstone (SiO2 with iron oxide inclusions)

Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining) (Quartz (SiO₂)) — Mineral

Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)

Quartz (SiO₂)

Quartzite with Iron Staining (Quartzite (primarily SiO2 with Fe2O3 staining)) — metamorphic

Quartzite with Iron Staining

Quartzite (primarily SiO2 with Fe2O3 staining)

Red Jasper (Silicon Dioxide (SiO2) with Hematite inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Basalt with Mineral Vein (Cobble) (Basalt (with likely Quartz/Calcite vein)) — Igneous

Basalt with Mineral Vein (Cobble)

Basalt (with likely Quartz/Calcite vein)

Jasper (Agate/Jasper (Microcrystalline Quartz, SiO2)) — sedimentary

Jasper

Agate/Jasper (Microcrystalline Quartz, SiO2)

Glauconitic Sandstone (Glauconitic Quartz-Wacke / Sandstone (Fe(II),Fe(III),Al,Mg)2-3(Si,Al)4O10(OH)2) — sedimentary

Glauconitic Sandstone

Glauconitic Quartz-Wacke / Sandstone (Fe(II),Fe(III),Al,Mg)2-3(Si,Al)4O10(OH)2

Red Jasper (Microcrystalline Quartz) (SiO2 (Silicon Dioxide) with Iron Oxide inclusions) — sedimentary

Red Jasper (Microcrystalline Quartz)

SiO2 (Silicon Dioxide) with Iron Oxide inclusions

Quartz with Iron Stains (Quartz (SiO2) with iron oxide/hydroxide staining) — Mineral

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Sandstone (with Iron Siderite Concretion) (Arenite with Ironstone Concretion (FeCO3)) — sedimentary

Sandstone (with Iron Siderite Concretion)

Arenite with Ironstone Concretion (FeCO3)

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

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Quartz Geode (Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity) — mineral

Quartz Geode

Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity

Corundum (Sapphire variant) (Aluminium oxide (Al2O3)) — mineral

Corundum (Sapphire variant)

Aluminium oxide (Al2O3)

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite/Limonite inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Limonite inclusions

Jasper (likely river-worn) (Silicon Dioxide (SiO2)) — sedimentary

Jasper (likely river-worn)

Silicon Dioxide (SiO2)

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

Quartz Geode

Silicon Dioxide (SiO2)

Mineral/Sedimentary

Dendritic Agate (Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)) — mineral

Dendritic Agate

Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)

Quartzite Pebble (River Rock) (Quartzite (mainly SiO2)) — metamorphic

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

Gneiss (Cobble) (Gneiss) — metamorphic

Gneiss (Cobble)

Gneiss

Pink Opal (Hydrated Amorphous Silica (SiO2·nH2O)) — mineraloid

Pink Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Chert (Arrowhead Debitage or Spall) (Silicon Dioxide (SiO₂)) — sedimentary

Chert (Arrowhead Debitage or Spall)

Silicon Dioxide (SiO₂)

River Cobble (Quartzite-rich Sandstone) (Clastic Sedimentary Rock (Litharenite/Quartzite transition)) — sedimentary

River Cobble (Quartzite-rich Sandstone)

Clastic Sedimentary Rock (Litharenite/Quartzite transition)

Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

Red Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)