Rock Identifier

Category

Rock

Browse rock specimens identified by the Rock Identifier community.

Amygdaloidal Basalt (Amygdaloidal Basalt) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt

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

Ferruginous Sandstone (Gerrit)

Arenite with Iron Oxide cementation

Quartzite with Chlorite/Epidote (Metamorphosed Quartzite (SiO2)) — metamorphic

Quartzite with Chlorite/Epidote

Metamorphosed Quartzite (SiO2)

Granitic Pegmatite (Granite Pegmatite (coarse-grained intrusive igneous rock)) — igneous

Granitic Pegmatite

Granite Pegmatite (coarse-grained intrusive igneous rock)

Chert / Jasper (Sedimentary Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert / Jasper

Sedimentary Cryptocrystalline Quartz (SiO2)

Yellow Jasper (Silicon Dioxide (SiO2) with iron hydroxides (Goethite)) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Grey River Pebble (Likely Quartz-rich or Limestone) (Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)) — sedimentary

Grey River Pebble (Likely Quartz-rich or Limestone)

Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)

Mica Schist (Mica Schist (primarily Muscovite and Quartz)) — metamorphic

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Apache Tear (Obsidian (Hydrated Silica Rich Volcanic Glass)) — igneous

Apache Tear

Obsidian (Hydrated Silica Rich Volcanic Glass)

Quartzite (River Pebble) (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Green Glass Slag (Amorphous Silicon Dioxide (SiO2) with metal oxide impurities) — mineraloid (man-made)

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

mineraloid (man-made)

Sandstone (Quartzose Sandstone) (Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Apache Tear (Obsidian (Hydrated Volcanic Glass) - SiO2 (with impurities)) — igneous

Apache Tear

Obsidian (Hydrated Volcanic Glass) - SiO2 (with impurities)

Iron-stained Quartzite (Quartzite with Limonite/Hematite staining (SiO2 with FeO(OH)·nH2O)) — metamorphic

Iron-stained Quartzite

Quartzite with Limonite/Hematite staining (SiO2 with FeO(OH)·nH2O)

Ferruginous Quartz (Silicon Dioxide (SiO2) with Iron Oxide (Hematite/Limonite) inclusions) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Hematite/Limonite) inclusions

Ironstone (likely siderite or goethite-rich siltstone) (Ferruginous Siltstone) — sedimentary

Ironstone (likely siderite or goethite-rich siltstone)

Ferruginous Siltstone

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

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Geode (Unopened) (Silica-rich concretion (SiO2)) — sedimentary

Geode (Unopened)

Silica-rich concretion (SiO2)

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

Yellow Jasper

Silicon Dioxide (SiO2) with iron impurities

Scoria (Vesicular Basalt / Scoria) — igneous

Scoria

Vesicular Basalt / Scoria

Clear Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble (Recrystallized Quartz (SiO2)) — metamorphic

Quartzite Pebble

Recrystallized Quartz (SiO2)

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

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Serpentine (Serpentine Group (primarily Antigorite or Lizardite), Mg3Si2O5(OH)4) — metamorphic

Serpentine

Serpentine Group (primarily Antigorite or Lizardite), Mg3Si2O5(OH)4

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

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Limonite inclusions

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Sedimentary Breccia (Breccia (Clastic Sedimentary Rock)) — sedimentary

Sedimentary Breccia

Breccia (Clastic Sedimentary Rock)

Limonite (Iron Ore) (FeO(OH)·nH2O (Hydrous ferric oxide)) — mineral

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Dalmatian Jasper (Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)) — igneous

Dalmatian Jasper

Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)

Granite (Felsic Plutonic Rock (primarily SiO2, Al2O3, K2O, Na2O)) — igneous

Granite

Felsic Plutonic Rock (primarily SiO2, Al2O3, K2O, Na2O)

Granitic Gneiss (Gneiss (High-grade Metamorphic Rock)) — metamorphic

Granitic Gneiss

Gneiss (High-grade Metamorphic Rock)

Quartzite River Rock (Metamorphic Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

Sandstone (Arenite (SiO2 principal)) — sedimentary

Sandstone

Arenite (SiO2 principal)

Quartz Vein in Host Rock (Breccia/Rhyolite) (Silicon Dioxide (SiO2) with matrix) — Mineral in Igneous/Sedimentary host

Quartz Vein in Host Rock (Breccia/Rhyolite)

Silicon Dioxide (SiO2) with matrix

Mineral in Igneous/Sedimentary host

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

Olivine (Peridotite)

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

Conglomerate (Clastic Sedimentary Rock (Conglomerate)) — sedimentary

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Diorite (Diorite (Intermediate plutonic rock)) — igneous

Diorite

Diorite (Intermediate plutonic rock)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone (likely Red/Brown Sandstone) (Arenite (SiO2 based)) — sedimentary

Sandstone (likely Red/Brown Sandstone)

Arenite (SiO2 based)