Yellow Quartzite (or Quartz River Pebble)
Silicon Dioxide (SiO2)
metamorphic
Category
Sedimentary (Alluvial Deposit)
Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.
Agate (River Pea)
Microcrystalline Chalcedony (SiO2)
sedimentary
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Chert (and Quartz Gravel)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Diamond
Diamond (Pure Carbon - C)
mineral
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Diamond
Diamond (pure carbon C)
mineral
Poppy Jasper
Jasper (variety of Chalcedony), SiO2 (Silicon Dioxide)
sedimentary
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Gold Nugget
Native Gold (Au)
mineral
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (lithified rudite)
sedimentary
Conglomerate
Clastic Sedimentary Conglomerate (SiO2, CaCO3, etc.)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Rough Agate/Chert Nodules
Cryptocrystalline Quartz (SiO2)
sedimentary
Rough Corundum (likely Sapphire or Common Corundum)
Aluminum oxide (Al2O3)
mineral
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Diamond inlaid in Jewelry
Carbon (C)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Agate
Silicon Dioxide / Cryptocrystalline Quartz (SiO2)
mineral
Blue Sapphire (faceted in jewelry)
Corundum (Al2O3)
mineral
Pink Sapphire
Corundum (Al2O3 with trace Chromium and Iron)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Gold
Native Gold (Au)
Mineral
Diamond (in jewelry)
Carbon (C)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
General Gravel (River Rock/River Stones)
Mixed Lithic Sediments (Conglomerate Clasts)
sedimentary
Arkosic Sandstone
Arkose
sedimentary
Conglomerate (River Rock Aggregate)
Conglomerate (Lithic-clast conglomerate)
sedimentary
Gold
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Amber
Succinite
Organic (Mineraloid)