Rock Identifier

Category

Sedimentary (Alluvial Deposit)

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

Learn about Sedimentary (Alluvial Deposit) in the encyclopedia

Turbidite

Sapropel

Rock Gypsum

Mixed River Pebbles (Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts) — sedimentary

Mixed River Pebbles

Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts

River Rock (Quartz-dominated) (Silicon Dioxide (SiO2) mixture with varied clastic sediments) — sedimentary (alluvial deposit)

River Rock (Quartz-dominated)

Silicon Dioxide (SiO2) mixture with varied clastic sediments

sedimentary (alluvial deposit)

Citrine (or Yellow Chalcedony / Quartz) (Silicon Dioxide (SiO2)) — mineral

Citrine (or Yellow Chalcedony / Quartz)

Silicon Dioxide (SiO2)

Blue Zircon (Zircon (Zirconium Silicate, ZrSiO4)) — gemstone

Blue Zircon

Zircon (Zirconium Silicate, ZrSiO4)

Mixed stream gravel and cobbles (Polylithic alluvial deposit; individual clasts are not identifiable at this resolution) — sedimentary

Mixed stream gravel and cobbles

Polylithic alluvial deposit; individual clasts are not identifiable at this resolution

Yellow Quartz / Chalcedony (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz / Chalcedony

Silicon Dioxide (SiO2)

River Stone (River Pebbles) (Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)) — sedimentary

River Stone (River Pebbles)

Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)

Chalcedony (Agate/Carnelian variant) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

Rounded brown river pebble (Indeterminate lithic fragment; possibly weathered sandstone, mudstone, or basalt) — sedimentary

Rounded brown river pebble

Indeterminate lithic fragment; possibly weathered sandstone, mudstone, or basalt

Dendritic Jasper (Bumblebee like Agate) (Silicon Dioxide with inclusions (SiO2)) — sedimentary

Dendritic Jasper (Bumblebee like Agate)

Silicon Dioxide with inclusions (SiO2)

Conglomerate (puddingstone) (Polymict conglomerate; rounded pebbles and cobbles cemented in a finer matrix) — sedimentary

Conglomerate (puddingstone)

Polymict conglomerate; rounded pebbles and cobbles cemented in a finer matrix

Stream cobbles and gravel (Unidentified mixed fluvial clasts; likely quartzite, sandstone, and igneous/metamorphic fragments) — sedimentary

Stream cobbles and gravel

Unidentified mixed fluvial clasts; likely quartzite, sandstone, and igneous/metamorphic fragments

Brown Agate (Silicon Dioxide (SiO2)) — sedimentary

Brown Agate

Silicon Dioxide (SiO2)

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

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

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

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Yellow Chalcedony (Agate/Jasper mix) (Silicon Dioxide (SiO2)) — mineral

Yellow Chalcedony (Agate/Jasper mix)

Silicon Dioxide (SiO2)

Rounded brown river pebble (Indeterminate lithic clast; possibly weathered sandstone or fine-grained volcanic rock) — sedimentary

Rounded brown river pebble

Indeterminate lithic clast; possibly weathered sandstone or fine-grained volcanic rock

Conglomeratic gravel / lithified alluvial deposit (Polymictic conglomerate or pebble-rich sandstone (likely weakly cemented)) — sedimentary

Conglomeratic gravel / lithified alluvial deposit

Polymictic conglomerate or pebble-rich sandstone (likely weakly cemented)

Quartz-rich sandstone or granite-derived gravel fragment (Likely quartz (SiO₂) grains cemented in sandstone; exact identification is uncertain from the image) — sedimentary

Quartz-rich sandstone or granite-derived gravel fragment

Likely quartz (SiO₂) grains cemented in sandstone; exact identification is uncertain from the image

Polished Mookaite Jasper (SiO2 (Silicon Dioxide with impurities)) — sedimentary

Polished Mookaite Jasper

SiO2 (Silicon Dioxide with impurities)

Quartz (River Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Weathered river cobble, likely quartzite or sandstone (Indeterminate; probable quartz-rich sandstone/quartzite) — sedimentary

Weathered river cobble, likely quartzite or sandstone

Indeterminate; probable quartz-rich sandstone/quartzite

Rounded quartz-rich river pebbles (Alluvial gravel; commonly quartzite, chert, and quartz-bearing sandstone fragments) — sedimentary

Rounded quartz-rich river pebbles

Alluvial gravel; commonly quartzite, chert, and quartz-bearing sandstone fragments

Chert Pebble (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Pebble

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tumbled jasper or chert pebble (Microcrystalline quartz (SiO₂), likely iron-stained jasper/chert) — sedimentary

Tumbled jasper or chert pebble

Microcrystalline quartz (SiO₂), likely iron-stained jasper/chert

Yellow Chert (Microcrystalline Quartz) (Chert / SiO2 (Silicon Dioxide)) — sedimentary

Yellow Chert (Microcrystalline Quartz)

Chert / SiO2 (Silicon Dioxide)

River Stone (Quartzite/Chert) (Metamorphosed Quartz-rich Sedimentary Rock) — metamorphic

River Stone (Quartzite/Chert)

Metamorphosed Quartz-rich Sedimentary Rock

Quartz (Citrine or Smoky variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Citrine or Smoky variant)

Silicon Dioxide (SiO2)

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

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Weathered rounded cobble (Indeterminate lithology; likely weathered sandstone or volcanic rock) — sedimentary

Weathered rounded cobble

Indeterminate lithology; likely weathered sandstone or volcanic rock

Rounded quartz-rich pebble (Likely quartz arenite (quartz sandstone) or quartz-rich metamorphic pebble) — sedimentary

Rounded quartz-rich pebble

Likely quartz arenite (quartz sandstone) or quartz-rich metamorphic pebble

Chert (specifically Gray/Tan Chert Node) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Gray/Tan Chert Node)

Microcrystalline Quartz (SiO2)

Almandine Garnet (weathered) (Almandine (Fe3Al2(SiO4)3)) — mineral

Almandine Garnet (weathered)

Almandine (Fe3Al2(SiO4)3)

Conglomerate (possibly breccia) (Clastic sedimentary rock; chiefly quartz- and feldspar-rich clasts in a weathered iron-oxide cement) — sedimentary

Conglomerate (possibly breccia)

Clastic sedimentary rock; chiefly quartz- and feldspar-rich clasts in a weathered iron-oxide cement

Chert Pebble (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Pebble

Microcrystalline or cryptocrystalline Quartz (SiO2)

Amber (Fossilized Tree Resin) — gemstone

Amber

Fossilized Tree Resin

Quartz Pebble (with Dark Volcanic/Sedimentary Inclusion) (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble (with Dark Volcanic/Sedimentary Inclusion)

Silicon Dioxide (SiO2)

Yellow Jasper (SiO2 (Microcrystalline Quartz)) — mineral

Yellow Jasper

SiO2 (Microcrystalline Quartz)

Carnelian (Chalcedony (SiO2)) — gemstone

Carnelian

Chalcedony (SiO2)

Jasper with Hematite inclusions (Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)) — sedimentary

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Quartz (Citrine / Yellow Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Citrine / Yellow Quartz)

Silicon Dioxide (SiO2)

Quartz (with iron oxide staining) (Silicon Dioxide (SiO2)) — mineral

Quartz (with iron oxide staining)

Silicon Dioxide (SiO2)