Rock Identifier

Category

Mineral, Often Found As Detrital Grains In Sedimentary Rocks

Browse mineral, often found as detrital grains in sedimentary rocks specimens identified by the Rock Identifier community.

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

Ferruginous Sandstone (Gerrit)

Arenite with Iron Oxide cementation

Ironstone Concretion (Moqui Marble Type) (Goethite/Hematite-cemented Sandstone Concretion) — sedimentary

Ironstone Concretion (Moqui Marble Type)

Goethite/Hematite-cemented Sandstone Concretion

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz) (Quartz (Silicon Dioxide, SiO2)) — mineral

White Quartz (Milky Quartz)

Quartz (Silicon Dioxide, SiO2)

Granite (Granite) — igneous

Granite

Granite

Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz Geode (Silicon dioxide (SiO2)) — mineral

Quartz Geode

Silicon dioxide (SiO2)

Limonite with Trace Fossils (Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)) — sedimentary

Limonite with Trace Fossils

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Banded Agate (Chert/Chaldcedony) (Silicon Dioxide (SiO₂)) — mineral

Banded Agate (Chert/Chaldcedony)

Silicon Dioxide (SiO₂)

Petrified Wood (Silicified Wood (primarily SiO2)) — mineral

Petrified Wood

Silicified Wood (primarily SiO2)

Granite (Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Smoky Quartz (Herkimer-style) (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz (Herkimer-style)

Silicon Dioxide (SiO2)

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Quartzite River Rock (Quartzite (SiO2)) — metamorphic

Quartzite River Rock

Quartzite (SiO2)

Fluorite (Green Fluorite) (Fluorite (Calcium Fluoride, CaF2)) — mineral

Fluorite (Green Fluorite)

Fluorite (Calcium Fluoride, CaF2)

Granite (Granite) — igneous

Granite

Granite

Chalcedony (Banded/Mottled Variety) (Chalcedony (a cryptocrystalline variety of Quartz, SiO2)) — Mineral

Chalcedony (Banded/Mottled Variety)

Chalcedony (a cryptocrystalline variety of Quartz, SiO2)

Quartz-veined Mudstone or Argillite (SiO2 (Quartz) in Siltstone/Mudstone matrix) — sedimentary

Quartz-veined Mudstone or Argillite

SiO2 (Quartz) in Siltstone/Mudstone matrix

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Chalcedony (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony

Cryptocrystalline Quartz (SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Chalcedony with Matrix (Silicon Dioxide (SiO2)) — mineral

Chalcedony with Matrix

Silicon Dioxide (SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Common Opal (Hydrated amorphous form of silica (SiO2·nH2O)) — mineral

Common Opal

Hydrated amorphous form of silica (SiO2·nH2O)

Conglomerate (Clastic sedimentary rock (Psephite)) — sedimentary

Conglomerate

Clastic sedimentary rock (Psephite)

Peacock Ore (Chalcopyrite) (Chalcopyrite (CuFeS2)) — mineral

Peacock Ore (Chalcopyrite)

Chalcopyrite (CuFeS2)

Leopard Skin Jasper (Silicon Dioxide (SiO2) with various inclusions) — sedimentary

Leopard Skin Jasper

Silicon Dioxide (SiO2) with various inclusions

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Biotite Mica (K(Mg, Fe)3AlSi3O10(F, OH)2) — mineral

Biotite Mica

K(Mg, Fe)3AlSi3O10(F, OH)2

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining) (Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.) — Metamorphic or Sedimentary (with staining)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Metamorphic or Sedimentary (with staining)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Granite (Granite (a felsic intrusive igneous rock)) — Igneous rock

Granite

Granite (a felsic intrusive igneous rock)

Blue Apatite (Apatite-(CaF), Ca5(PO4)3F) — mineral

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Barite Rose on Marcasite (Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)) — mineral

Barite Rose on Marcasite

Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)

Gold Flake (Native Gold (Au)) — mineral

Gold Flake

Native Gold (Au)

Liesegang Ring Siltstone (Siltstone with iron oxide Liesegang bands) — sedimentary

Liesegang Ring Siltstone

Siltstone with iron oxide Liesegang bands

Marble (polished) (Recrystallized Calcite (CaCO3)) — metamorphic

Marble (polished)

Recrystallized Calcite (CaCO3)

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

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

White Agate (Chalcedony)

Silicon Dioxide (SiO2)

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

Quartz Pebble (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)