Granite and Mixed Landscape Gravel
Plutonic Igneous Rock / Weathered Alluvium
igneous
Category
Sedimentary (Alluvial Deposit)
Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Alluvial Deposit) in the encyclopedia
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Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Corundum (Sapphire and Ruby)
Aluminum Oxide (Al2O3)
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold Flakes
Native Gold (Au)
mineral
Pink sandstone
Quartz-rich siliciclastic sandstone, likely arkose or subarkose
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
River Cobble (Quartzite-rich Sandstone)
Clastic Sedimentary Rock (Litharenite/Quartzite transition)
sedimentary
Rough Ruby
Corundum (Al2O3) with Chromium traces
mineral
Yellow Sapphire
Corundum (Al2O3)
mineral
Orange-red jasper pebble
Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides
mineral
Ferruginous Conglomerate
Conglomerate with Iron-Oxide Matrix (SiO2 + Fe2O3/FeO(OH))
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Ruby (Pinkish-Red)
Corundum (Al2O3 with Chromium trace)
mineral
Polished dendritic agate or jasper pebble
Microcrystalline quartz (SiO₂), likely chalcedony with iron-oxide inclusions
mineral
Conglomerate
Conglomerate (Sedimentary Rock)
sedimentary
Likely flint or chert fragment
Microcrystalline quartz (SiO₂), probably flint/chert
sedimentary
Diamond (in a jewelry setting)
Carbon (C)
mineral
Polished brown jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Limonite)
mineral
Diamond
Carbon (C)
gemstone
Diamond (Cut Gemstones in Jewelry)
Carbon (C)
gemstone
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Diamond (or Clear Zircon/Sapphire)
Carbon (C)
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
White Quartz (Tumbled/Waterworn)
Silicon Dioxide (SiO2)
mineral
Quartz with Celadonite Inclusion
Silicon Dioxide (SiO2) with green clay mineral inclusions
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Diamond (C)
mineral
Diamond
Carbon (C)
mineral
Sapphire in a ring
Corundum (Al2O3)
mineral
Diamond
C (Carbon)
mineral
Quartz River Pebbles
Silicon Dioxide (SiO2)
sedimentary
Diamond
C (Carbon)
gemstone
Basalt Pebble
Basalt
igneous
Diamond (Cut Specimen)
Diamond (pure carbon, C)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Carbon (C)
mineral
Diamond
Diamond (C)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral