Sandstone
Arenite (primarily SiO2)
Category
Browse anthropogenic sedimentary (man made) specimens identified by the Rock Identifier community.
Sandstone
Arenite (primarily SiO2)
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
Sandstone
Arenite (specifically sublithic or quartz arenite)
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sandstone Pebble
Ferruginous Sandstone (SiO2 with Fe2O3)
Blue Slag Glass
Amorphous Silica (Byproduct of smelting)
Slate
Metamorphic Pelitic Rock
Sandstone
Sedimentary Rock (Quartz arenite)
Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
Asphalt aggregate (crushed stone in bitumen)
Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen
Chert (Flint)
Silicon Dioxide (SiO2)
Chert
Chert (SiO2)
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
Chert Arrowhead (Jasper)
Chert (Cryptocrystalline Quartz, SiO2)
Sandstone
Arenite
Diamond (or Diamond Simulant)
Carbon (C)
Diamond in Kimberlite
Diamond (C in Kimberlite)
Chert (Flint nodule)
Chert (SiO2)
Chert / Flint
Microcrystalline Quartz (SiO2)
Flint
SiO2 (Cryptocrystalline Quartz)
Brecciated Jasper
Brecciated Jasper (Microcrystalline Quartz / SiO2)
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Sandstone
Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Bog Iron / Limonite Concretion
Goethite/Limonite mixture (FeO(OH)·nH2O)
Chert
Microcrystalline silica (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
Chert Nodule
Microcrystalline Quartz (SiO2)
Sandstone
Arenite (composed primarily of Quartz: SiO2)
Chert (Chert / Flint)
Microcrystalline Quartz (SiO2)
Tumbled brown chalcedony (likely jasper or agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining
Diamond (in jewelry setting)
Diamond (C - Carbon)
Chert (Chert / Flint Variety)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
Carved Stone Turtle
Carved Soapstone and Quartz
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
Chert
Microcrystalline quartz (SiO2)
Flint / Chert Pebble
Microcrystalline Quartz (SiO2)
Flint
Silicon dioxide (Microcrystalline Quartz / Chert)
Chert (or Flint)
Microcrystalline quartz (SiO2)