Tumbled amber-colored agate or jasper
Microcrystalline quartz (SiO₂), likely chalcedony with iron-oxide inclusions
mineral
Category
Sedimentary (Alluvial Deposit)
Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.
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River Pebbles / Mudstone
Sedimentary Rock / Silty Claystone
sedimentary
Conglomerate
Conglomerate
sedimentary
Conglomerate
Polymictic clast-supported conglomerate, likely ferruginous
sedimentary
Diamond
Natural Diamond (Carbon, C)
gemstone
Diamond (Faceted)
Carbon (C)
gemstone
Unakite
Granitic rock composed of pink orthoclase feldspar, green epidote, and clear quartz
metamorphic
River Pebble (Granite/Gneiss)
Granitic Pebble / Quartz-Feldspar Aggregate
igneous
Quartzite Cobble (Iron-stained)
Quartzite (SiO2)
metamorphic
Rough Diamond
C (Native Carbon)
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Taaffeite
BeMgAl4O8 (Beryllium Magnesium Aluminum Oxide)
mineral
Yellow Jade (Nephrite or Quartzite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jade-colored Quartzite (SiO2)
metamorphic
Blue Star Sapphire
Corundum (Al2O3)
mineral
Diamond
Carbon (C)
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Diamond
Diamond (pure native carbon, C)
mineral
Rough Diamond
Diamond (C)
mineral
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Rough Diamond
Diamond (Native Carbon, C)
mineral
Amber (Green variation)
Succinite
fossil
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
mineral
River Pebble Quartzite / Granite Cobble
Quartz-rich Granitic / Quartzite Cobble
igneous
Raw Diamond
Diamond (C)
mineral
Basalt River Pebble
Mafic volcanic rock (Basalt)
igneous
Smoky Quartz (with possible Feldspar inclusions)
Silicon Dioxide (SiO2)
mineral
Diamond (in jewelry setting)
Diamond (Native Carbon, C)
mineral
Diamond
Diamond (Pure Carbon, C)
mineral
Diamond
Diamond (Pure Carbon, C)
mineral
Rough Diamond
Carbon (C)
mineral
Conglomerate
Sedimentary Conglomerate
sedimentary
Gossan (Limonite/Ironstone)
Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Conglomerate
Conglomerate
sedimentary
Conglomerate with Quartz Inclusions
Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Rounded quartz-rich pebble, likely sandstone or granitic-derived pebble
Indeterminate clastic rock; likely quartz-rich sandstone/conglomerate clast
sedimentary
Jasper Pebble
Tumbled Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Ruby
Corundum (Aluminum Oxide with Chromium traces), Al2O3:Cr
mineral
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Conglomerate
Clastic sedimentary rock (Psephite)
sedimentary