River Rock (Quartz-dominated)
Silicon Dioxide (SiO2) mixture with varied clastic sediments
sedimentary (alluvial deposit)
Category
Sedimentary (Alluvial Deposit)
Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.
River Stone (River Pebbles)
Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)
sedimentary
Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO2)
mineral
Dendritic Jasper (Bumblebee like Agate)
Silicon Dioxide with inclusions (SiO2)
sedimentary
Brown Agate
Silicon Dioxide (SiO2)
sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Chalcedony (Agate/Jasper mix)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Chert Pebble
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Chert (Microcrystalline Quartz)
Chert / SiO2 (Silicon Dioxide)
sedimentary
Quartz (Citrine or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Gray/Tan Chert Node)
Microcrystalline Quartz (SiO2)
sedimentary
Almandine Garnet (weathered)
Almandine (Fe3Al2(SiO4)3)
mineral
Chert Pebble
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
sedimentary
Quartz (with iron oxide staining)
Silicon Dioxide (SiO2)
mineral
Basalt with Caliche Crust
Aphanitic Mafic Igneous Rock with Calcium Carbonate (CaCO3) coating
igneous
Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
mineral / metamorphic
Quartz (Smoky/Milky variant)
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Yellow/Milky variety)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Chalcedony (SiO2) with iron oxide inclusions
mineral
Quartz (Rose or Milky variety fragment)
Silicon Dioxide (SiO2)
mineral
Sandstone (Stream-rounded Cobble)
Arenite (composed primarily of SiO2, Silica)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sapphire
Corundum (Al2O3)
mineral
Nephrite Jade
Calcium Magnesium Iron Silicate Hydroxide - Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Quartz (Milk Quartz Cobble)
Silicon Dioxide (SiO2)
mineral
Chert (Yellow Jasper/River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Gold Mineral
Native Gold (Au)
mineral
Jasper and Quartz River Cobble
Silicon Dioxide (SiO2) with Hematite inclusions
Sedimentary / Metamorphic
Gold Nugget
Native Gold (Au)
mineral
Corundum (Sapphire/Ruby in Matrix)
Aluminium oxide (Al2O3)
mineral
Riverstone Quartzite (Iron-stained)
Quartzite (primarily SiO2 with Limonite/Goethite staining)
metamorphic
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
River Pebble (Quartzite/Siltstone mixture)
Silicon Dioxide (SiO2) mixture with varied clastic minerals
sedimentary/metamorphic
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Pink Sapphire
Corundum (Al2O3 with Chromium/Titanium/Iron traces)
mineral