Rock Identifier

Category

Sedimentary Or Igneous (Secondary Formation)

Browse sedimentary or igneous (secondary formation) specimens identified by the Rock Identifier community.

Pearl (Calcium Carbonate (CaCO3) - Aragonite/Calcite) — mineral

Pearl

Calcium Carbonate (CaCO3) - Aragonite/Calcite

Dalmatian Stone (Dalmatian Jasper (Aplitic Rock)) — igneous

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Dalmatian Stone (Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock) — igneous

Dalmatian Stone

Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock

Rock Salt / Halite Crust (Halite (Sodium Chloride, NaCl)) — sedimentary

Rock Salt / Halite Crust

Halite (Sodium Chloride, NaCl)

Chert (variations include Flint/Jasper) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (variations include Flint/Jasper)

Cryptocrystalline Quartz (SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Chert (Agatized Chert) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Agatized Chert)

Microcrystalline Quartz (SiO2)

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

Red Jasper (Chert)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Quartz (Milky/Crystalline variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Quartz Mineral (Silicon Dioxide (SiO2)) — mineral

Quartz Mineral

Silicon Dioxide (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Pyrite in Matrix (often with Chalcopyrite) (Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)) — mineral

Pyrite in Matrix (often with Chalcopyrite)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

Gneiss (Gneiss (High-grade metamorphic rock)) — metamorphic

Gneiss

Gneiss (High-grade metamorphic rock)

Potassium Feldspar and Quartz (KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)) — mineral

Potassium Feldspar and Quartz

KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)

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

Chalcedony (Agate/Quartz)

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Smoky Quartz and Clear Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz and Clear Quartz Geode

Silicon Dioxide (SiO2)

Basalt (Afanitic Mafic Basalt) — igneous

Basalt

Afanitic Mafic Basalt

Chert (varieties include Flint and Jasper) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

River Stone (likely Siltstone or fine-grained Basalt) (Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)) — sedimentary or igneous

River Stone (likely Siltstone or fine-grained Basalt)

Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)

sedimentary or igneous

Anthracite Coal (Coal (predominantly carbon)) — sedimentary

Anthracite Coal

Coal (predominantly carbon)

River Pebbles (Stream-rounded rocks) (Fluvial Detritus (varied mineralogy)) — Mixed (predominantly sedimentary and igneous)

River Pebbles (Stream-rounded rocks)

Fluvial Detritus (varied mineralogy)

Mixed (predominantly sedimentary and igneous)

Chert / Flint (Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂) — Mineral

Chert / Flint

Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂

Chert (or possibly Flint) (Chert (variant: Flint)) — Sedimentary

Chert (or possibly Flint)

Chert (variant: Flint)

Dalmatian Stone (Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock)) — igneous

Dalmatian Stone

Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock)

Botryoidal Chalcedony (Agate/Chert Nodule) (Chalcedony (SiO2)) — mineral

Botryoidal Chalcedony (Agate/Chert Nodule)

Chalcedony (SiO2)

Ruby (Corundum (Al2O3:Cr)) — mineral

Ruby

Corundum (Al2O3:Cr)

Red Garnet (Pyrope-Almandine series (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)) — mineral

Red Garnet

Pyrope-Almandine series (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)

Carnelian (a variety of Chalcedony) (Silicon dioxide (SiO2) with iron oxide impurities) — mineral

Carnelian (a variety of Chalcedony)

Silicon dioxide (SiO2) with iron oxide impurities

Milky Quartz (Quartz (Silicon Dioxide - SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Red Sandstone (Arenite (with Iron Oxide cement)) — sedimentary

Red Sandstone

Arenite (with Iron Oxide cement)

Banded Chert (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Banded Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Sandstone (Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)) — sedimentary

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)

Chrysocolla in Jasper (Chryso-Jasper) (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)) — mineral

Chrysocolla in Jasper (Chryso-Jasper)

Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)

Ferruginous Sandstone (Gozzan/Ironstone) (Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)) — sedimentary

Ferruginous Sandstone (Gozzan/Ironstone)

Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)

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

Hematite

Iron(III) oxide (Fe2O3)

Greywacke (Greywacke (Lithofeldspathic Sandstone)) — sedimentary

Greywacke

Greywacke (Lithofeldspathic Sandstone)