Rock Identifier

Category

Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Browse sedimentary rock (technically a microcrystalline quartz mineral aggregate) specimens identified by the Rock Identifier community.

Learn about Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate) in the encyclopedia

Chert

Kiwi Jasper

Coal

Flower Jasper

Feather Jasper

Claystone

Shale

Dendritic Jasper

Sandstone

Zebra Jasper

Siltstone

Bumblebee Jasper

Bumblebee Jasper

Chert Concretion (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Small white crystalline mineral fragment (Indeterminate; possibly calcite or quartz) — mineral

Small white crystalline mineral fragment

Indeterminate; possibly calcite or quartz

Chert (often called Flint) (Chert (Microcrystalline or cryptocrystalline Silica, SiO2)) — sedimentary

Chert (often called Flint)

Chert (Microcrystalline or cryptocrystalline Silica, SiO2)

Decorative polished pebbles (Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt) — mineral

Decorative polished pebbles

Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt

Polished yellow jasper (Jasper, microcrystalline quartz (SiO₂), commonly containing iron oxides and other silicates) — mineral

Polished yellow jasper

Jasper, microcrystalline quartz (SiO₂), commonly containing iron oxides and other silicates

Sandstone Pebble (Sedimentary Clastic Rock (Quartz Arenite)) — sedimentary

Sandstone Pebble

Sedimentary Clastic Rock (Quartz Arenite)

Tumbled quartz-rich pebble (Microcrystalline quartz (SiO₂), possibly chalcedony or quartzite) — mineral

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly chalcedony or quartzite

Dalmation Stone (Peralkaline Rock (SiO2 with Arfvedsonite)) — igneous

Dalmation Stone

Peralkaline Rock (SiO2 with Arfvedsonite)

Polished jasper pebble, likely brecciated or picture jasper (Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions) — gemstone

Polished jasper pebble, likely brecciated or picture jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite/Limonite inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Limonite inclusions

Tumbled yellow jasper or silicified rock fragment (Microcrystalline quartz (chalcedony), SiO₂, likely iron-oxide colored) — mineral

Tumbled yellow jasper or silicified rock fragment

Microcrystalline quartz (chalcedony), SiO₂, likely iron-oxide colored

Geode (Silicon Dioxide (Quartz/Chalcedony) in carbonate or volcanic host rock) — sedimentary

Geode

Silicon Dioxide (Quartz/Chalcedony) in carbonate or volcanic host rock

Banded Iron Formation (Fragment) (Banded Iron Formation (BIF)) — sedimentary

Banded Iron Formation (Fragment)

Banded Iron Formation (BIF)

Chert (White-Tan variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (White-Tan variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Moss Agate (Silicon Dioxide with inclusions (SiO2 + impurities)) — mineral

Moss Agate

Silicon Dioxide with inclusions (SiO2 + impurities)

Pale quartz-rich stone, possibly calcite (Likely quartz (SiO₂) or calcite (CaCO₃); image resolution prevents confident separation) — mineral

Pale quartz-rich stone, possibly calcite

Likely quartz (SiO₂) or calcite (CaCO₃); image resolution prevents confident separation

Concretion (Sedimentary Concretion (Ironstone / Calcite Concretion)) — sedimentary

Concretion

Sedimentary Concretion (Ironstone / Calcite Concretion)

Dark gray chert or flint nodule (Microcrystalline quartz (SiO₂), commonly chalcedony/quartz) — sedimentary

Dark gray chert or flint nodule

Microcrystalline quartz (SiO₂), commonly chalcedony/quartz

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

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Pebble / Sandstone / Siltstone (Sedimentary Rock (Quartz Sandstone / Siltstone)) — sedimentary

Pebble / Sandstone / Siltstone

Sedimentary Rock (Quartz Sandstone / Siltstone)

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

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Earth (Terra / Earth) — igneous, sedimentary, and metamorphic

Earth

Terra / Earth

igneous, sedimentary, and metamorphic

Quartz and Mixed Sedimentary Rocks (Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies) — sedimentary

Quartz and Mixed Sedimentary Rocks

Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies

Polished gray agate or chalcedony (Microcrystalline quartz (SiO₂), likely gray chalcedony/agate) — gemstone

Polished gray agate or chalcedony

Microcrystalline quartz (SiO₂), likely gray chalcedony/agate

Geode (Unopened) (Silicon Dioxide (SiO2) in sedimentary vugs) — sedimentary

Geode (Unopened)

Silicon Dioxide (SiO2) in sedimentary vugs

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

Chert

Chert (Microcrystalline Quartz, SiO2)

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

Chert / Flint

Microcrystalline Quartz (SiO2)

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

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Dyed Quartz Geode (Silicon Dioxide (SiO2) with artificial purple dye) — mineral

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial purple dye

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Jasper (likely brecciated or chalcedony-rich jasper) (Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide impurities) — sedimentary

Jasper (likely brecciated or chalcedony-rich jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide impurities

Weathered quartz-rich river cobble, possibly quartzite (Quartzite (mostly microcrystalline SiO₂), tentatively identified) — metamorphic

Weathered quartz-rich river cobble, possibly quartzite

Quartzite (mostly microcrystalline SiO₂), tentatively identified

Chert (Iron-stained) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Quartzite Pebble (Metamorphic Quartz-rich Rock (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartz-rich Rock (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Tree Agate (Dendritic Agate) (Silicon Dioxide (SiO2) with Manganese/Iron inclusions) — mineral

Tree Agate (Dendritic Agate)

Silicon Dioxide (SiO2) with Manganese/Iron inclusions

Chert with Calcite Veining (Microcrystalline Quartz (SiO2) with Calcium Carbonate (CaCO3) veins) — sedimentary

Chert with Calcite Veining

Microcrystalline Quartz (SiO2) with Calcium Carbonate (CaCO3) veins

Chert (Chalcedony-rich sedimentary rock) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Chalcedony-rich sedimentary rock)

Cryptocrystalline Quartz (SiO2)

Banded Agate (with small Geode cavity) (Silicon Dioxide (SiO2) - Chalcedony variety) — mineral

Banded Agate (with small Geode cavity)

Silicon Dioxide (SiO2) - Chalcedony variety

Dalmatian Stone (Dalmatian Stone (formerly called Dalmatian Jasper)) — igneous

Dalmatian Stone

Dalmatian Stone (formerly called Dalmatian Jasper)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)