Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Category
Sedimentary (Alluvial Deposit)
Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.
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Likely tumbled jasper or iron-rich chert
Microcrystalline quartz (SiO₂), variably colored by iron oxides
mineral
Mixed river pebbles (gravel)
Polymictic alluvial gravel; diverse clasts, likely including quartz, feldspar-rich granitoids, and metamorphic rocks
sedimentary
Conglomerate
Polymictic conglomerate, likely carbonate-cemented
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sand (Construction Grade)
Unconsolidated siliciclastic sediment (primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Tumbled purple-blue corundum, possibly sapphire
Corundum (Al₂O₃); blue-to-purple varieties are sapphire
gemstone
Yellow Agate (Aqeeq / Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
River Cobble (Sandstone / Greywacke)
Sedimentary Rock (predominantly Quartz, Feldspar, Lithic fragments)
sedimentary
Conglomerate
Conglomerate (SiO2 primary clasts with lithic matrix)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Chalcedony (SiO2 with Iron Oxide impurities)
mineral
Conglomerate
Clastic Sedimentary Conglomerate
sedimentary
Conglomerate
Conglomerative Sedimentary Rock
sedimentary
Conglomerate
Clast-supported polymictic conglomerate
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Small rounded pebble, likely quartz-rich river stone
Indeterminate; likely quartz/chert-bearing lithic clast
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
sedimentary
Quartz Pebble (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
mineral
Green Sandstone Pebble (River/Beach Pebble)
Glauconitic Sandstone
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Diamond (in jewelry)
Carbon (C)
mineral
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Weathered conglomeratic river pebble
Polymictic conglomerate, likely ferruginous chert/sandstone matrix
sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide impurities
mineral
Quartz-bearing polymictic conglomerate
Conglomerate with milky quartz clasts; composition may include quartzite and weathered feldspathic/mafic rock fragments
sedimentary
Silty Sand / Loam
Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)
sedimentary
Epidote (Unakite component) / Green Quartzite
Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Pea Gravel / River Gravel
Unconsolidated Clastic Sedimentary Aggregate
sedimentary
Gold Nugget Cluster
Native Gold (Au)
mineral
Conglomerate
Lithified, poorly sorted gravel; likely a carbonate-cemented conglomerate
sedimentary
Chert (Quartzite-rich River Pebble)
Silicon Dioxide (SiO2)
sedimentary
Gold
Native Gold (Au)
mineral