Rock Identifier

Category

Sedimentary (Chemically Precipitated)

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

Learn about Sedimentary (Chemically Precipitated) in the encyclopedia

Sinter

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Jasper (Microcrystalline quartz (SiO2)) — sedimentary

Jasper

Microcrystalline quartz (SiO2)

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

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Quartz / Calcite Pebble (Indeterminate due to severe blur) (SiO2 (Quartz) or CaCO3 (Calcite)) — mineral

Quartz / Calcite Pebble (Indeterminate due to severe blur)

SiO2 (Quartz) or CaCO3 (Calcite)

Chert (Agatized) (Silicon dioxide (SiO2)) — sedimentary

Chert (Agatized)

Silicon dioxide (SiO2)

Ironstone concretion (likely limonite/goethite-rich) (Iron-oxide-cemented sediment, commonly goethite (FeO(OH)) and/or limonite) — sedimentary

Ironstone concretion (likely limonite/goethite-rich)

Iron-oxide-cemented sediment, commonly goethite (FeO(OH)) and/or limonite

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

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Quartz pebble with a conchoidal chip (Silicon dioxide (SiO2)) — mineral

Quartz pebble with a conchoidal chip

Silicon dioxide (SiO2)

Quartz (Milky/Bull Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Bull Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Chert (SiO2)) — sedimentary

Chert

Chert (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Ironstone concretion (probable hematite–goethite-rich ironstone) (Iron oxide/hydroxide concretion; chiefly hematite (Fe₂O₃) and goethite (FeO(OH)), with possible magnetite and quartz) — sedimentary

Ironstone concretion (probable hematite–goethite-rich ironstone)

Iron oxide/hydroxide concretion; chiefly hematite (Fe₂O₃) and goethite (FeO(OH)), with possible magnetite and quartz

Red Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Red Jasper

Microcrystalline Quartz (SiO2)

Iron Ore (Hematite/Magnetite mixture) (Ferrous Oxide (Fe2O3 / Fe3O4)) — sedimentary

Iron Ore (Hematite/Magnetite mixture)

Ferrous Oxide (Fe2O3 / Fe3O4)

Weathered quartz-rich river stone (Chert or silicified limestone/quartzite; exact identification requires testing) — sedimentary

Weathered quartz-rich river stone

Chert or silicified limestone/quartzite; exact identification requires testing

Pink Dyed Agate (Silicon Dioxide (SiO2) with artificial pigment) — sedimentary

Pink Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Dyed Blue Agate Slice (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Dyed Blue Agate Slice

Chalcedony (Silicon Dioxide, SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Likely bituminous coal or carbon-rich shale fragment (Bituminous coal; predominantly carbon with macerals and minor clay/pyrite) — sedimentary

Likely bituminous coal or carbon-rich shale fragment

Bituminous coal; predominantly carbon with macerals and minor clay/pyrite

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)

Quartz Sand Grain (Silicon Dioxide (SiO2)) — sedimentary

Quartz Sand Grain

Silicon Dioxide (SiO2)

Bandized Calcite (Calcium Carbonate (CaCO3)) — sedimentary

Bandized Calcite

Calcium Carbonate (CaCO3)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Rounded quartz-rich pebble (Milky quartz or quartzite; predominantly silicon dioxide (SiO₂)) — sedimentary

Rounded quartz-rich pebble

Milky quartz or quartzite; predominantly silicon dioxide (SiO₂)

Hematitic Sandstone (Sandstone with Iron Oxide (Hematite) staining) — sedimentary

Hematitic Sandstone

Sandstone with Iron Oxide (Hematite) staining

Likely quartz pebble (Quartz (SiO₂), possibly milky or iron-stained quartz) — mineral

Likely quartz pebble

Quartz (SiO₂), possibly milky or iron-stained quartz

Orange Calcite with Siderite/Iron Oxide Coating (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite with Siderite/Iron Oxide Coating

Calcium Carbonate (CaCO3)

Light-colored quartz pebble (Quartz, silicon dioxide (SiO₂)) — mineral

Light-colored quartz pebble

Quartz, silicon dioxide (SiO₂)

Banded Sandstone (Liesegang Rings) (Sedimentary sandstone with Iron oxide precipitates) — sedimentary

Banded Sandstone (Liesegang Rings)

Sedimentary sandstone with Iron oxide precipitates

Banded Chert (Silicon Dioxide (SiO2)) — sedimentary

Banded Chert

Silicon Dioxide (SiO2)

Aragonite (Aragonite (CaCO3)) — mineral

Aragonite

Aragonite (CaCO3)

Amber-colored bead earrings (Likely amber (fossilized tree resin); material cannot be confirmed from the image) — gemstone

Amber-colored bead earrings

Likely amber (fossilized tree resin); material cannot be confirmed from the image

Tumbled metallic sulfide mineral, likely pyrite (Pyrite (FeS₂), tentatively; possibly marcasite or a pyrite-rich nodule) — mineral

Tumbled metallic sulfide mineral, likely pyrite

Pyrite (FeS₂), tentatively; possibly marcasite or a pyrite-rich nodule

Limonite/goethite-rich ironstone concretion (probable) (Goethite–limonite, chiefly FeO(OH)·nH₂O, possibly with hematite and manganese oxides) — mineral

Limonite/goethite-rich ironstone concretion (probable)

Goethite–limonite, chiefly FeO(OH)·nH₂O, possibly with hematite and manganese oxides

Chert (Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (Microcrystalline quartz (SiO2)) — sedimentary

Chert

Microcrystalline quartz (SiO2)