Conglomerate
Conglomerate
sedimentary
Category
Sedimentary (Alluvial Deposit)
Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.
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Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Nephrite Jade
Calcium Magnesium Iron Silicate Hydroxide - Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz Pebbles
Silicon Dioxide (SiO2)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - Chalcedony with Iron Oxide impurities
mineral
Milky Quartz Pebble with Matrix
Silicon Dioxide (SiO2)
mineral
Quartz (Milk Quartz Cobble)
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper and Quartz River Cobble
Silicon Dioxide (SiO2) with Hematite inclusions
Sedimentary / Metamorphic
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Conglomerate (pebble conglomerate)
Clastic sedimentary rock composed of rounded gravel-sized clasts in a finer matrix
sedimentary
River Pebble
Siliceous rock fragment / Quartzite / Sandstone pebble
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
River Pebbles (White Quartz and Basalt mix)
Mixed Clastic Sedimentary Assemblage (SiO2 and Mafic Volcanics)
sedimentary
Chert (with possible fossils)
Microcrystalline quartz (SiO2)
sedimentary
River Cobble (Conglomerate context)
Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)
sedimentary
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
River Cobble (Quartzite / Sandstone)
Quartzite / Siliciclastic Sedimentary Rock
sedimentary
Yellow Quartz (Chert/Chalcedony)
Silicon Dioxide (SiO2) with iron inclusions
mineral
River Pebble (Quartzite/Siltstone mixture)
Silicon Dioxide (SiO2) mixture with varied clastic minerals
sedimentary/metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate
Sedimentary
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Carnelian (Chalcedony)
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
mineral
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities
mineral
River Gravel
Polymictic gravel and pebble aggregate
sedimentary
Jasper-Agate
Silicon Dioxide (SiO2)
sedimentary
Yellow Quartz / Citrine Pebble
Silicon Dioxide (SiO2)
mineral
Brown Jasper / River Siltstone
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Conglomerate (or Breccia)
Clastic Sedimentary Rock (Conglomeratic)
sedimentary
Ironstone pebble
Ironstone (Ferruginous Sedimentary Rock)
sedimentary
Mixed rounded river gravel
Polymictic alluvial gravel; likely mixtures of quartzite, granite, basalt, sandstone, and other silicate rocks
sedimentary
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Riverstone Quartzite (Iron-stained)
Quartzite (primarily SiO2 with Limonite/Goethite staining)
metamorphic