Rock Identifier

Category

Sedimentary (Microcrystalline Silicate)

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

Learn about Sedimentary (Microcrystalline Silicate) in the encyclopedia

Chert

Ironstone

Kambaba Jasper

Quartzite Sandstone

Quartzite Sandstone

Diatomite

Chrysoprase (Chalcedony (Silicon Dioxide, SiO2)) — gemstone

Chrysoprase

Chalcedony (Silicon Dioxide, SiO2)

Weathered, iron-stained rock fragment (Unidentified iron-oxide-stained silicate rock; precise identification is not possible from the image) — sedimentary

Weathered, iron-stained rock fragment

Unidentified iron-oxide-stained silicate rock; precise identification is not possible from the image

Polished orbicular jasper (likely ocean jasper) (Microcrystalline quartz (SiO₂), chiefly chalcedony with iron oxides and other silicate inclusions) — mineral

Polished orbicular jasper (likely ocean jasper)

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron oxides and other silicate inclusions

Green Sea Glass (Man-made silicate glass (weathered)) — sedimentary

Green Sea Glass

Man-made silicate glass (weathered)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Common Opal (Green Opal) (Hydrated Silicon Dioxide (SiO2·nH2O)) — mineral

Common Opal (Green Opal)

Hydrated Silicon Dioxide (SiO2·nH2O)

Cream Marble (Speckled) (Metamorphosed Limestone (mainly CaCO3)) — metamorphic

Cream Marble (Speckled)

Metamorphosed Limestone (mainly CaCO3)

Glauconitic Sandstone (Glauconitic Quartz Arenite) — sedimentary

Glauconitic Sandstone

Glauconitic Quartz Arenite

Weathered limestone or calcareous fossil fragment (Calcite-rich carbonate rock (CaCO₃), possibly fossiliferous limestone) — sedimentary

Weathered limestone or calcareous fossil fragment

Calcite-rich carbonate rock (CaCO₃), possibly fossiliferous limestone

White Marble (Recrystallized Calcite (CaCO3)) — metamorphic

White Marble

Recrystallized Calcite (CaCO3)

Concrete aggregate surface (Human-made cementitious composite; primarily calcium-silicate-hydrate cement with mixed silicate aggregate) — sedimentary

Concrete aggregate surface

Human-made cementitious composite; primarily calcium-silicate-hydrate cement with mixed silicate aggregate

Rhodonite (Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Bauxite (Bauxite (Al(OH)3, AlO(OH))) — sedimentary

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Kaolinite Claystone (Al2Si2O5(OH)4 (Kaolinite)) — sedimentary

Kaolinite Claystone

Al2Si2O5(OH)4 (Kaolinite)

Zebra Jasper (Tainted Silicate (mainly Quartz/Chalcedony/Calcite)) — sedimentary

Zebra Jasper

Tainted Silicate (mainly Quartz/Chalcedony/Calcite)

Limonite (Iron Ore) (Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)

Polished ocean jasper / brecciated jasper (Jasper, microcrystalline quartz (SiO₂), with iron-oxide and other silicate inclusions) — mineral

Polished ocean jasper / brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and other silicate inclusions

Vesicular limestone or calcareous tufa (Calcite-rich carbonate rock; predominantly CaCO₃, commonly aragonite/calcite) — sedimentary

Vesicular limestone or calcareous tufa

Calcite-rich carbonate rock; predominantly CaCO₃, commonly aragonite/calcite

Mookaite Jasper (Radiolarite (Silica-rich sedimentary rock featuring Hematite and Goethite)) — sedimentary

Mookaite Jasper

Radiolarite (Silica-rich sedimentary rock featuring Hematite and Goethite)

Gastropod Fossil (Class Gastropoda (fossilized)) — fossil

Gastropod Fossil

Class Gastropoda (fossilized)

Unidentified gray mineral/rock fragment (Indeterminate from image; possibly quartz-rich material or mica-bearing schist) — mineral

Unidentified gray mineral/rock fragment

Indeterminate from image; possibly quartz-rich material or mica-bearing schist

Bauxite (Iron-stained Chert / Ironstone Aggregate) (Hydrous aluminum oxide mixture (mainly Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Goethite α-Fe3+O(OH))) — sedimentary

Bauxite (Iron-stained Chert / Ironstone Aggregate)

Hydrous aluminum oxide mixture (mainly Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Goethite α-Fe3+O(OH))

Green Common Opal (Hydrated Silica (SiO2·nH2O)) — mineral

Green Common Opal

Hydrated Silica (SiO2·nH2O)

Mica Schist with Pyrite (Muscovite/Biotite Schist (Complex Silicate)) — metamorphic

Mica Schist with Pyrite

Muscovite/Biotite Schist (Complex Silicate)

Sandstone (Ferruginous) (Arenite (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Bauxite (AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)) — sedimentary

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

Marble (Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)) — metamorphic

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Likely limestone or chalky carbonate rock (Calcite-rich carbonate rock; chiefly calcium carbonate (CaCO₃)) — sedimentary

Likely limestone or chalky carbonate rock

Calcite-rich carbonate rock; chiefly calcium carbonate (CaCO₃)

Weathered fossiliferous limestone (Calcitic limestone, primarily calcium carbonate (CaCO₃), possibly containing fossil shell fragments) — sedimentary

Weathered fossiliferous limestone

Calcitic limestone, primarily calcium carbonate (CaCO₃), possibly containing fossil shell fragments

Banded calcite (travertine-like carbonate) (Calcite, CaCO₃; likely banded limestone or cave travertine) — sedimentary

Banded calcite (travertine-like carbonate)

Calcite, CaCO₃; likely banded limestone or cave travertine

Banded Calcite (often sold as Onyx Marble) (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often sold as Onyx Marble)

Calcite (Calcium Carbonate, CaCO3)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Sandstone with Hematite staining (Arenite with Fe2O3 inclusions) — sedimentary

Sandstone with Hematite staining

Arenite with Fe2O3 inclusions

Small brown mineral fragment, possibly quartz/chert (Uncertain; likely microcrystalline quartz (SiO₂) or a weathered silicate rock) — mineral

Small brown mineral fragment, possibly quartz/chert

Uncertain; likely microcrystalline quartz (SiO₂) or a weathered silicate rock

Claystone / Mudstone (Mudstone (Hydrous aluminum silicate rich rock)) — sedimentary

Claystone / Mudstone

Mudstone (Hydrous aluminum silicate rich rock)

Polished black stone, likely basalt or black jasper (Indeterminate; possible fine-grained basalt (plagioclase–pyroxene) or black jasper/microcrystalline quartz) — igneous

Polished black stone, likely basalt or black jasper

Indeterminate; possible fine-grained basalt (plagioclase–pyroxene) or black jasper/microcrystalline quartz

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Bauxite (Bauxite (Al2O3·nH2O)) — sedimentary

Bauxite

Bauxite (Al2O3·nH2O)

Fossilized Coprolite (Coprolite (fossilized feces)) — sedimentary

Fossilized Coprolite

Coprolite (fossilized feces)

Sandstone (with Iron Oxide staining) (Arenite (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (with Iron Oxide staining)

Arenite (primarily SiO2 with Fe2O3 staining)