Petrified Wood
Silicified Wood (SiO2)
sedimentary
Category
Sedimentary (Alluvial Deposit)
Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.
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Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Native Gold Nugget
Gold (Au)
mineral
Red Sandstone Pebble
Arenite with Hematite (Fe2O3) cement
sedimentary
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Diamond
Diamond (Pure Carbon - C)
mineral
Diamond
Diamond (C)
mineral
Diamond
Diamond (pure carbon C)
mineral
Gold
Native Gold (Au)
Mineral
Red sandstone
Ferruginous arkosic sandstone, likely iron-oxide cemented quartz–feldspar rock
sedimentary
Conglomerate
Conglomerate
sedimentary
Conglomerate (possibly fossiliferous limestone breccia)
Polymictic conglomerate; clasts commonly quartz, chert, and carbonate cement (exact identification requires testing)
sedimentary
Rounded river pebble, likely basalt or andesite
Fine-grained mafic volcanic rock; commonly plagioclase ± pyroxene, olivine, and iron oxides
igneous
Conglomeratic sandstone / breccia-like gravel rock
Polymictic conglomerate (possibly lithified gravel or concrete-like natural conglomerate)
sedimentary
Blue Sapphire (faceted in jewelry)
Corundum (Al2O3)
mineral
Chalcedony (Carnelian / Agate pebble)
Microcrystalline Quartz (SiO2)
mineral
Ruby (faceted gemstone)
Corundum (Al2O3 with Cr impurities)
gemstone
Tumbled Yellow Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Gold
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Conglomerate
Sedimentary Conglomerate
sedimentary
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Weathered sandstone or arkose
Quartz–feldspar clastic sedimentary rock; likely arkosic sandstone
sedimentary
Quartz-rich breccia or conglomerate
Siliciclastic conglomerate/breccia, predominantly quartz and feldspar clasts in a rusty iron-oxide cement
sedimentary
Arkosic Sandstone
Arkose
sedimentary
Conglomerate (River Rock Aggregate)
Conglomerate (Lithic-clast conglomerate)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Diamond
C
gemstone
Diamond inlaid in Jewelry
Carbon (C)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Gold
Native gold (Au)
mineral
Tumbled chalcedony (likely brown-yellow jasper or agate)
Microcrystalline quartz (SiO₂), chalcedony variety
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Likely chalcedony (gray agate), rough fragment
Microcrystalline quartz, SiO₂; “agate” applies if distinct banding is present
mineral
Conglomerate (or Breccia / Porphyry)
Clastic Sedimentary Rock (Conglomerate / Sandstone)
sedimentary
Likely quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomeratic sandstone or breccia
Lithic arkose / polymictic conglomeratic sandstone
sedimentary