Rock Identifier

Category

Organic Structure (Not A Rock)

Browse organic structure (not a rock) specimens identified by the Rock Identifier community.

Lapis Lazuli (Lapis Lazuli (a rock type, not a single mineral; main component is Lazurite (Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)])) — Metamorphic Rock (primarily composed of minerals)

Lapis Lazuli

Lapis Lazuli (a rock type, not a single mineral; main component is Lazurite (Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)])

Metamorphic Rock (primarily composed of minerals)
Granite (Phaneritic Intrusive Igneous Rock (Granite)) — igneous

Granite

Phaneritic Intrusive Igneous Rock (Granite)

igneous
Sandstone with trace fossil (Sandstone, possibly with Skolithos or similar trace fossil) — sedimentary

Sandstone with trace fossil

Sandstone, possibly with Skolithos or similar trace fossil

sedimentary
Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

metamorphic
Jasper (Yellow Jasper) (Silicon Dioxide (SiO2) with iron inclusions) — sedimentary

Jasper (Yellow Jasper)

Silicon Dioxide (SiO2) with iron inclusions

sedimentary
Basalt (Basalt) — igneous

Basalt

Basalt

igneous
Basalt (Basalt) — igneous

Basalt

Basalt

igneous
Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

igneous
Basalt River Cobble (Basalt (Composition primarily Plagioclase Feldspar and Pyroxene)) — igneous

Basalt River Cobble

Basalt (Composition primarily Plagioclase Feldspar and Pyroxene)

igneous
Basalt (River Pebble) (Extrusive Magic Igneous Rock (Mainly Plagioclase and Pyroxene)) — igneous

Basalt (River Pebble)

Extrusive Magic Igneous Rock (Mainly Plagioclase and Pyroxene)

igneous
Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

igneous
Basalt (Mafic volcanic rock (Primarily Plagioclase Feldspar and Pyroxene)) — Igneous

Basalt

Mafic volcanic rock (Primarily Plagioclase Feldspar and Pyroxene)

Igneous
Smoky Quartz in Matrix (Silicon dioxide (SiO2) within Pegmatite/Gneiss) — igneous

Smoky Quartz in Matrix

Silicon dioxide (SiO2) within Pegmatite/Gneiss

igneous
Basalt (Basalt (dominated by plagioclase feldspar and pyroxene)) — igneous

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Grey Agate (Tumbled) (Silicon Dioxide (SiO2)) — mineral

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

mineral
Basalt (tumbled/water-worn) (Extrusive mafic igneous rock) — igneous

Basalt (tumbled/water-worn)

Extrusive mafic igneous rock

igneous
Unakite or Epidosite (Epidosite (Mineral composition: Epidote, Feldspar, and Quartz)) — metamorphic

Unakite or Epidosite

Epidosite (Mineral composition: Epidote, Feldspar, and Quartz)

metamorphic
Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

mineral
Iron Slag (Anthropogenic Iron Silicate) — industrial byproduct

Iron Slag

Anthropogenic Iron Silicate

industrial byproduct
Sandstone (Quartzite texture) (Arenite (SiO2 secondary)) — sedimentary

Sandstone (Quartzite texture)

Arenite (SiO2 secondary)

sedimentary
Sandstone (Ferruginous) (Arenite (primarily SiO2 with iron oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

sedimentary
Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

mineral
Basalt (Extrusive Mafic Igneous Rock) — igneous

Basalt

Extrusive Mafic Igneous Rock

igneous
Basalt (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

igneous
Granodiorite (Granodiorite (Intermediate plutonic rock)) — igneous

Granodiorite

Granodiorite (Intermediate plutonic rock)

igneous
Blue Chalcedony (likely dyed Agate) (Silicon Dioxide (SiO₂)) — mineral

Blue Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO₂)

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

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

metamorphic
Quartzite with inclusions (Metamorphic Rock (Mainly SiO2)) — metamorphic

Quartzite with inclusions

Metamorphic Rock (Mainly SiO2)

metamorphic
Diorite (Dalmatian Stone) (Phaneritic Plutonic Diorite) — igneous

Diorite (Dalmatian Stone)

Phaneritic Plutonic Diorite

igneous
Unakite (Epidotized Granite (Fe, Ca, Al silicate + KAlSi3O8)) — metamorphic

Unakite

Epidotized Granite (Fe, Ca, Al silicate + KAlSi3O8)

metamorphic
Sandstone (Arenite) — sedimentary

Sandstone

Arenite

sedimentary
Greenstone (Greenschist (composed of actinolite, chlorite, and epidote)) — metamorphic

Greenstone

Greenschist (composed of actinolite, chlorite, and epidote)

metamorphic
Basalt with Quartz Vein (Mafic Igneous Rock (SiO2 filling)) — igneous

Basalt with Quartz Vein

Mafic Igneous Rock (SiO2 filling)

igneous
Basalt (Extrusive Igneous Basalt (contains Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Extrusive Igneous Basalt (contains Plagioclase Feldspar and Pyroxene)

igneous
Unakite (Unakite (altered granitic rock: SiO2 + Ca2(Al,Fe)3(SiO4)3(OH))) — metamorphic

Unakite

Unakite (altered granitic rock: SiO2 + Ca2(Al,Fe)3(SiO4)3(OH))

metamorphic
Unakite (Unakite (Epidotized Granite)) — metamorphic

Unakite

Unakite (Epidotized Granite)

metamorphic
Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

igneous
Unakite (Unakite (Epidotized Granite)) — metamorphic

Unakite

Unakite (Epidotized Granite)

metamorphic
Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

metamorphic
Basalt (Basalt) — igneous

Basalt

Basalt

igneous
Red Sandstone (Old Red Sandstone) (Ferruginous Sandstone (SiO2 + Fe2O3)) — sedimentary

Red Sandstone (Old Red Sandstone)

Ferruginous Sandstone (SiO2 + Fe2O3)

sedimentary