Rock Identifier

Category

Organic Materia (Not A Rock Or Mineral)

Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.

Sandstone with Ironstone Concretion (Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))) — sedimentary

Sandstone with Ironstone Concretion

Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))

Sandstone (Ferruginous) (Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)) — sedimentary

Sandstone (Ferruginous)

Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)

Serpentine (variety: Serpentine Rock) (Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4) — metamorphic

Serpentine (variety: Serpentine Rock)

Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Prehnite (Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate hydroxide)) — mineral

Prehnite

Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate hydroxide)

Turquoise (Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O

Chert / Flint (Silicon Dioxide (SiO2)) — sedimentary

Chert / Flint

Silicon Dioxide (SiO2)

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

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Yellow Quartzite (Beach Pebble) (Quartzite (primarily SiO2)) — metamorphic

Yellow Quartzite (Beach Pebble)

Quartzite (primarily SiO2)

Diamond in Kimberlite (Diamond (C in Kimberlite Matrix)) — igneous

Diamond in Kimberlite

Diamond (C in Kimberlite Matrix)

Chevron Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities

Basalt with Amygdules (Amygdaloidal Basalt) — igneous

Basalt with Amygdules

Amygdaloidal Basalt

Sandstone (Sandstone (Clastic Sedimentary Rock)) — Sedimentary Rock

Sandstone

Sandstone (Clastic Sedimentary Rock)

Sedimentary Rock

Agate (Geode nodule) (Cryptocrystalline Quartz (SiO2)) — mineral

Agate (Geode nodule)

Cryptocrystalline Quartz (SiO2)

Clear Quartz (Druzy/Crystal Cluster) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Druzy/Crystal Cluster)

Silicon Dioxide (SiO2)

Black Tourmaline (Schorl) (Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4) — mineral

Black Tourmaline (Schorl)

Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4

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

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

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

Gneiss

High-grade regional metamorphic rock (Foliated)

Red Sandstone (Arenite (Fe2O3-rich)) — sedimentary

Red Sandstone

Arenite (Fe2O3-rich)

Basalt (Crushed Roadstone) (Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)) — igneous

Basalt (Crushed Roadstone)

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Obsidian (Obsidian (Volcanic Glass; SiO2 content > 70%)) — igneous

Obsidian

Obsidian (Volcanic Glass; SiO2 content > 70%)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

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

Granite

Granite (Phaneritic intrusive igneous rock)

Obsidian (Volcanic glass (high silica volcanic rock)) — igneous

Obsidian

Volcanic glass (high silica volcanic rock)

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

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

Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Granite (Phaneritic Felsic Igneous Rock (Granite)) — igneous

Granite

Phaneritic Felsic Igneous Rock (Granite)

Diorite (Diorite (Intermediate intrusive igneous rock)) — igneous

Diorite

Diorite (Intermediate intrusive igneous rock)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (likely Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (likely Quartzose)

Arenite (primarily SiO2)

Crazy Lace Agate (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Crazy Lace Agate

Chalcedony (Silicon Dioxide, SiO2)

Diabase (Greenstone) (Diabase (also known as Dolerite)) — igneous

Diabase (Greenstone)

Diabase (also known as Dolerite)

Piddock bored rock (likely Mudstone or Shale) (Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock) — sedimentary

Piddock bored rock (likely Mudstone or Shale)

Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock

Basalt (Extrusive Mafic Igneous Rock) — igneous

Basalt

Extrusive Mafic Igneous Rock

Green Aventurine (Aventurine Quartz (SiO2 with inclusions)) — metamorphic

Green Aventurine

Aventurine Quartz (SiO2 with inclusions)

Granite (weathered/river-tumbled) (Granite (Plutonic Igneous Rock)) — Igneous Rock

Granite (weathered/river-tumbled)

Granite (Plutonic Igneous Rock)

Shale (Fissile Mudstone (primarily composed of clay minerals and quartz)) — sedimentary

Shale

Fissile Mudstone (primarily composed of clay minerals and quartz)

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

Chalcedony in Matrix

Silicon Dioxide (SiO2)

Porphyry (Flower Stone) (Porphyritic Basalt or Andesite) — igneous

Porphyry (Flower Stone)

Porphyritic Basalt or Andesite

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert Pebble (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Pebble

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Chert (Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Red Chert (Jasper)

Microcrystalline Quartz (SiO2)

Chert (Jasper transition) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper transition)

Microcrystalline Quartz (SiO2)