Chert (Cherty Shale / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Man Made Conglomerate)
Browse sedimentary (man made conglomerate) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Granodiorite
Granodiorite
Igneous
Chert
Silicon dioxide (SiO2)
Sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Diamond (in a jewelry setting)
Diamond (Carbon, C)
mineral
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Polished blue-green glassy slag or coated mineral fragment
Most likely man-made colored glass/slag; exact composition cannot be determined visually
mineral
Blue goldstone beads
Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli
mineral
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
sedimentary
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
Chert (Siltstone / Flint)
SiO2 (Cryptocrystalline Quartz)
sedimentary
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (with Quartz)
Microcrystalline Quartz (SiO2)
sedimentary
Mixed stream gravel and common rock specimens
Predominantly quartz-rich granitoid, quartzite, sandstone, shale/slate, and mafic volcanic fragments; exact species cannot be determined confidently from the image
igneous, sedimentary, metamorphic
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Assorted Beach Rocks and Pebbles
Various (Granite, Basalt, Quartz, Conglomerate, etc.)
igneous, sedimentary, metamorphic
River Cobble (Conglomerate context)
Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)
sedimentary
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sedimentary / Mineral
Sandstone Pebble
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary