Rock Identifier

Category

Mineralological Specimen

Browse mineralological specimen specimens identified by the Rock Identifier community.

Sandstone (Quartzose Sandstone) (Arenite (primarily SiO2 with minor Fe2O3)) — sedimentary

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

sedimentary
Sandstone (with ripple marks) (Arenite (SiO2 primarily)) — sedimentary

Sandstone (with ripple marks)

Arenite (SiO2 primarily)

sedimentary
Botryoidal Chalcedony (Druzy Quartz) (Silicon Dioxide (SiO2)) — mineral

Botryoidal Chalcedony (Druzy Quartz)

Silicon Dioxide (SiO2)

mineral
Quartz (Milky/Crystal Variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Crystal Variety)

Silicon Dioxide (SiO2)

mineral
Chert (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert

Chert (Silicon Dioxide, SiO2)

sedimentary
Chert (Arrowhead variety) (Chert (SiO2)) — sedimentary

Chert (Arrowhead variety)

Chert (SiO2)

sedimentary
Chert (Agate/Flint variant) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Agate/Flint variant)

Microcrystalline Quartz (SiO2)

sedimentary
Quartz (Chert/Chalcedony variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

mineral
Chert (Iron-stained) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary
Feldspathic Granite (likely Syenite or Granite Pegmatite) (Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)) — igneous

Feldspathic Granite (likely Syenite or Granite Pegmatite)

Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)

igneous
Granite (Pink/Red variety) (Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)) — igneous

Granite (Pink/Red variety)

Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)

igneous
Quartz Vein (Iron-stained) (Silicon Dioxide (SiO2) with limonite/hematite staining) — mineral

Quartz Vein (Iron-stained)

Silicon Dioxide (SiO2) with limonite/hematite staining

mineral
Riverstone Jasper (Chalcedony) (Silicon Dioxide (SiO2)) — sedimentary

Riverstone Jasper (Chalcedony)

Silicon Dioxide (SiO2)

sedimentary
Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

mineral
Rough Diamond (Diamond (pure carbon / C)) — mineral

Rough Diamond

Diamond (pure carbon / C)

mineral
Orbicular Jasper (Ocean Jasper) (Silicon Dioxide (SiO2) with iron and magnesium inclusions) — mineral

Orbicular Jasper (Ocean Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

mineral
Quartzite with Iron Mineral Banding (Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining) — metamorphic

Quartzite with Iron Mineral Banding

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining

metamorphic
Ferruginous Quartz (Iron-stained Quartz) (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — Mineral

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Mineral
Mica Schist with Iron Staining (Muscovite/Biotite Schist) — metamorphic

Mica Schist with Iron Staining

Muscovite/Biotite Schist

metamorphic
Basalt (Vesicular and Ropey) (Vesicular Basalt / Pahoehoe Basalt) — igneous

Basalt (Vesicular and Ropey)

Vesicular Basalt / Pahoehoe Basalt

igneous
Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment) (Elasmobranchii (fossil remains)) — sedimentary

Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)

Elasmobranchii (fossil remains)

sedimentary
Jasper (Iron-stained) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Jasper (Iron-stained)

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary
Sandstone (Arenite (SiO2 based clastic rock)) — sedimentary

Sandstone

Arenite (SiO2 based clastic rock)

sedimentary
Yellow Quartz (Citrinated Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrinated Quartz)

Silicon Dioxide (SiO2)

mineral
Basalt (Vesicular/Scoriaceous) (Extrusive Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)) — Igneous

Basalt (Vesicular/Scoriaceous)

Extrusive Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Igneous
Petrified Wood (Agatized/Silicified Wood) (Silicified Wood / Chalcedony (SiO2)) — sedimentary

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood / Chalcedony (SiO2)

sedimentary
Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

mineral
Quartzite Cobble (Meta-quartzite (SiO2)) — metamorphic

Quartzite Cobble

Meta-quartzite (SiO2)

metamorphic
Chert (Arrowhead variety) (Chert (SiO2)) — sedimentary

Chert (Arrowhead variety)

Chert (SiO2)

sedimentary
Glacial Erratic (Sandstone/Quartzite) (Glacial Erratic specimen (likely Orthoquartzite or Feldspathic Sandstone)) — sedimentary or metamorphic

Glacial Erratic (Sandstone/Quartzite)

Glacial Erratic specimen (likely Orthoquartzite or Feldspathic Sandstone)

sedimentary or metamorphic
Limonite (Limonite (Hydrous iron oxides, FeO(OH)·nH2O)) — mineral

Limonite

Limonite (Hydrous iron oxides, FeO(OH)·nH2O)

mineral
Rough Amber (likely Copal or immature Amber) (Organic gemstone / Succinite (if Baltic)) — mineral

Rough Amber (likely Copal or immature Amber)

Organic gemstone / Succinite (if Baltic)

mineral
Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

mineral
Concrete / Anthropogenic Conglomerate (Man-made composite material (Portland cement, aggregate, and water)) — not a natural rock

Concrete / Anthropogenic Conglomerate

Man-made composite material (Portland cement, aggregate, and water)

not a natural rock
Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Exposed Aggregate Concrete (Pea Gravel) (Concrete with Siliceous Alluvial Gravels) — sedimentary (man-made conglomerate)

Exposed Aggregate Concrete (Pea Gravel)

Concrete with Siliceous Alluvial Gravels

sedimentary (man-made conglomerate)
Basalt with Plagioclase Feldspar (Basalt (mafic extrusive igneous rock) with plagioclase feldspar phenocrysts) — Igneous

Basalt with Plagioclase Feldspar

Basalt (mafic extrusive igneous rock) with plagioclase feldspar phenocrysts

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

Red Jasper with Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

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

Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary
Chert (and Limestone) (Silicon Dioxide (SiO2)) — sedimentary

Chert (and Limestone)

Silicon Dioxide (SiO2)

sedimentary
Aquamarine with Ruby Accent (Beryllium Aluminum Silicate (Be3Al2Si6O18) with Aluminum Oxide (Al2O3)) — mineral

Aquamarine with Ruby Accent

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Aluminum Oxide (Al2O3)

mineral
Banded Calcite (often sold as Onyx or Mexican Onyx) (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often sold as Onyx or Mexican Onyx)

Calcite (Calcium Carbonate, CaCO3)

sedimentary