Rock Identifier

Category

Sedimentary (Biogenic)

Browse sedimentary (biogenic) specimens identified by the Rock Identifier community.

Quartz (Smoky/Grey variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Grey variety)

Silicon Dioxide (SiO2)

mineral
Tumbled Carnelian and Quartz Mix (Silicon Dioxide (SiO2) with iron oxide impurities) — mineral

Tumbled Carnelian and Quartz Mix

Silicon Dioxide (SiO2) with iron oxide impurities

mineral
Chert (Jasper/Flint variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

sedimentary
Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

mineral
Chalcedony (specifically Common Opal or Agate variant) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (specifically Common Opal or Agate variant)

Silicon Dioxide (SiO2)

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

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral
Ironstone Concretion (Nutstone) (Ironstone (with High Limonite/Hematite Content)) — sedimentary

Ironstone Concretion (Nutstone)

Ironstone (with High Limonite/Hematite Content)

sedimentary
Kyanite (Blue Kyanite) (Kyanite (Al2SiO5)) — mineral

Kyanite (Blue Kyanite)

Kyanite (Al2SiO5)

mineral
Halite (Rock Salt) (Halite (NaCl)) — mineral

Halite (Rock Salt)

Halite (NaCl)

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

Clear Quartz

Silicon Dioxide (SiO2)

mineral
Green Jasper (Silicon Dioxide (SiO2) with iron silicate inclusions) — sedimentary

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

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

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

sedimentary
Carnelian (Carnelian Agate) (Silicon dioxide (SiO2) - a variety of Chalcedony) — mineral

Carnelian (Carnelian Agate)

Silicon dioxide (SiO2) - a variety of Chalcedony

mineral
Clear Quartz (Silicon dioxide (SiO2)) — mineral

Clear Quartz

Silicon dioxide (SiO2)

mineral
Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

mineral
Aragonite (Sputnik habit) (Aragonite (Calcium Carbonate, CaCO3)) — mineral

Aragonite (Sputnik habit)

Aragonite (Calcium Carbonate, CaCO3)

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

Orange Calcite

Calcium Carbonate (CaCO3)

mineral
Jasper (Silicon dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

sedimentary
Garnet (Almandine) (Almandine Garnet (Fe3Al2(SiO4)3)) — Mineral

Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Mineral
Celestite (Celestine) (Strontium sulfate (SrSO4)) — mineral

Celestite (Celestine)

Strontium sulfate (SrSO4)

mineral
Chert / Flint Nodules in Limestone (Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert / Flint Nodules in Limestone

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

sedimentary
Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

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

Optical Calcite

Calcium Carbonate (CaCO3)

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

Honey Calcite

Calcium Carbonate (CaCO3)

mineral
Celestite (Celestine) (Strontium sulfate (SrSO4)) — mineral

Celestite (Celestine)

Strontium sulfate (SrSO4)

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

Clear Quartz Crystal

Silicon Dioxide (SiO2)

mineral
Bornite (Bornite (Cu5FeS4)) — mineral

Bornite

Bornite (Cu5FeS4)

mineral
Unidentifiable Rock Fragment — Uncertain

Unidentifiable Rock Fragment

Uncertain
Biotite Schist (Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)) — metamorphic

Biotite Schist

Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)

metamorphic
Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

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

Pink Chalcedony

Silicon Dioxide (SiO2)

mineral
Chalcedony in Limestone Host Rock (Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)) — Mineral within Sedimentary Rock

Chalcedony in Limestone Host Rock

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Mineral within Sedimentary Rock
Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Calcite

Calcite (Calcium Carbonate, CaCO3)

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

Clear Quartz

Silicon Dioxide (SiO2)

mineral
Mica Schist (Mica Schist (primarily Muscovite and Biotite composition)) — metamorphic

Mica Schist

Mica Schist (primarily Muscovite and Biotite composition)

metamorphic
Flint (within Limestone matrix) (Silicon dioxide (SiO2)) — sedimentary

Flint (within Limestone matrix)

Silicon dioxide (SiO2)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Quartz (Milky or White Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

mineral
Jasper (Jasper (Silicified microcrystalline quartz) - SiO2) — sedimentary

Jasper

Jasper (Silicified microcrystalline quartz) - SiO2

sedimentary
Ocean Jasper (Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)) — sedimentary

Ocean Jasper

Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)

sedimentary
Marble (polished) (Recrystallized Calcite (CaCO3)) — metamorphic

Marble (polished)

Recrystallized Calcite (CaCO3)

metamorphic
Jasper Agate (Chalcedony) (Silicon Dioxide (SiO2)) — sedimentary

Jasper Agate (Chalcedony)

Silicon Dioxide (SiO2)

sedimentary