Rock Identifier

Category

Sedimentary Or Igneous

Browse sedimentary or igneous specimens identified by the Rock Identifier community.

Diorite (River Cobble) (Phaneritic Intermediate Plutonic Rock) — igneous

Diorite (River Cobble)

Phaneritic Intermediate Plutonic Rock

Graphic Granite (Graphic Granite (Granite Pegmatite)) — igneous

Graphic Granite

Graphic Granite (Granite Pegmatite)

Granite (Granite (Felsic Plutonic Rock / SiO2 + Al2O3 + K2O + Na2O + CaO + FeO + MgO)) — igneous

Granite

Granite (Felsic Plutonic Rock / SiO2 + Al2O3 + K2O + Na2O + CaO + FeO + MgO)

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

Dalmation Stone (frequently called Dalmatian Jasper)

Peralkaline Quartz-Feldspar Rock

Granite Pebble (Granite (Phaneritic intrusive igneous rock)) — igneous

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Amethyst (Silicon Dioxide with trace Iron (SiO2)) — mineral

Amethyst

Silicon Dioxide with trace Iron (SiO2)

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

Quartz (Iron-stained or Ferruginous)

Silicon Dioxide (SiO2)

Red Chalcedony (likely dyed) (Chalcedony (a variety of Quartz), SiO2) — Mineral (Cryptocrystalline Quartz)

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Mineral (Cryptocrystalline Quartz)

Quartz (Silicon Dioxide (SiO₂)) — Mineral

Quartz

Silicon Dioxide (SiO₂)

Botryoidal Pyrite (Iron Sulfide (FeS2)) — mineral

Botryoidal Pyrite

Iron Sulfide (FeS2)

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

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Olivine (likely Peridot variety) (Olivine Mineral Group (specifically Forsterite-Fayalite solid solution series); Chemical formula: (Mg,Fe)2SiO4) — Mineral

Olivine (likely Peridot variety)

Olivine Mineral Group (specifically Forsterite-Fayalite solid solution series); Chemical formula: (Mg,Fe)2SiO4

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

Granite

Granite (felsic intrusive igneous rock)

Granite (Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).) — igneous

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Chert (Common Opal/Jasper variety) (Microcrystalline Quartz (SiO2) with hydration) — sedimentary

Chert (Common Opal/Jasper variety)

Microcrystalline Quartz (SiO2) with hydration

Fossiliferous Limestone with Brachiopods (Calcium Carbonate (CaCO3) with fossilized Brachiopoda sp. (likely Order Spiriferida or Rhynchonellida)) — sedimentary

Fossiliferous Limestone with Brachiopods

Calcium Carbonate (CaCO3) with fossilized Brachiopoda sp. (likely Order Spiriferida or Rhynchonellida)

Olivine (Peridotite) ((Mg,Fe)2SiO4 (Magnesium Iron Silicate)) — igneous

Olivine (Peridotite)

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

Granite (Granite (Felsic intrusive igneous rock)) — igneous

Granite

Granite (Felsic intrusive igneous rock)

Included Quartz Beads (likely Phantom Quartz or Garden Quartz) (Quartz (SiO2) with various mineral inclusions) — Mineral

Included Quartz Beads (likely Phantom Quartz or Garden Quartz)

Quartz (SiO2) with various mineral inclusions

Granite (Phaneritic plutonic rock (SiO2 typically >69%)) — igneous

Granite

Phaneritic plutonic rock (SiO2 typically >69%)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Red Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Satin Spar (Selenite) (Gypsum (CaSO4·2H2O)) — mineral

Satin Spar (Selenite)

Gypsum (CaSO4·2H2O)

Milky Quartz with Iron Staining (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Gold and Silver (in jewelry form) (Gold (Au) and Silver (Ag)) — mineral

Gold and Silver (in jewelry form)

Gold (Au) and Silver (Ag)

Astrophyllite (Astrophyllite (K2NaFe7Ti2Si8O26(OH)4F)) — mineral

Astrophyllite

Astrophyllite (K2NaFe7Ti2Si8O26(OH)4F)

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

Milky Quartz (Common Quartz)

Quartz (Silicon Dioxide, SiO2)

Schorl (Black Tourmaline) (Sodium Iron Aluminum Borosilicate Hydroxide; NaFe2+3Al6Si6O18(BO3)3(OH)3OH) — mineral

Schorl (Black Tourmaline)

Sodium Iron Aluminum Borosilicate Hydroxide; NaFe2+3Al6Si6O18(BO3)3(OH)3OH

Quartz (Smoky Quartz variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Quartz with Mica inclusions (Gold-colored Mica) (Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions) — Mineral

Quartz with Mica inclusions (Gold-colored Mica)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions

Basalt (Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)) — Igneous

Basalt

Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)

Sodalite Syenite (Sodalite-bearing Syenite (Na8(Al6Si6O24)Cl2)) — igneous

Sodalite Syenite

Sodalite-bearing Syenite (Na8(Al6Si6O24)Cl2)

Granite Pebble (Intrusive Felsic Igneous Rock (primarily SiO2 with Al2O3, K2O, Na2O)) — igneous

Granite Pebble

Intrusive Felsic Igneous Rock (primarily SiO2 with Al2O3, K2O, Na2O)

Granite Glacial Erratic (Granite (Phaneritic Quartz-Feldspar Plutonic Rock)) — igneous

Granite Glacial Erratic

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Obsidian (Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)) — igneous

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Olivine (Peridot) (Magnesium Iron Silicate (Mg,Fe)2SiO4) — mineral

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Puddingstone (Gowganda Tillite/Lorrain Quartzite) (Jasper Conglomerate) — sedimentary

Puddingstone (Gowganda Tillite/Lorrain Quartzite)

Jasper Conglomerate

Sandstone (Quartz Sandstone (predominantly)) — Sedimentary

Sandstone

Quartz Sandstone (predominantly)

Shale creek bed (Shale (fine-grained clastic sedimentary rock)) — Sedimentary

Shale creek bed

Shale (fine-grained clastic sedimentary rock)

Sandstone (Ferruginous) (Arenite (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Hag Stone (Siltstone or Fine-grained Sandstone with boring (e.g., Lithophaga impact)) — sedimentary

Hag Stone

Siltstone or Fine-grained Sandstone with boring (e.g., Lithophaga impact)

Sandstone (likely Arkosic) (Clastic Sedimentary Rock) — sedimentary

Sandstone (likely Arkosic)

Clastic Sedimentary Rock