Weathered sandstone or siltstone
Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by silica, iron oxides, or carbonate
Category
Browse sedimentary (man made composite) specimens identified by the Rock Identifier community.
Weathered sandstone or siltstone
Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by silica, iron oxides, or carbonate
Green Chert (Jasper)
Silicon Dioxide (SiO2)
Weathered chert or silicified limestone nodule
Microcrystalline quartz (SiO₂), possibly replacing limestone; exact identification requires testing
Dalmatian Stone
Peralkaline rhyolite
Sandstone (Red/Brown)
Arenite (composed primarily of SiO2)
Chert
Sedimentary Cryptocrystalline Quartz (SiO2)
Dyed Dalmatian Stone
Aplite (Alkali-feldspar granite) with Arfvedsonite
Sandstone
Sandstone (Quartz-rich sedimentary rock)
Polished red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
Sandstone (Feldspathic / Arkose)
Sandstone (SiO2 with variable mineral grains)
Sandstone
Arenite (primarily Quartz and Feldspar composition)
Sandstone
Arenite
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with iron oxide Fe2O3 staining)
Limestone Pebble
Limestone (Calcium Carbonate, CaCO3)
Sandstone (Stream-Rolled)
Clastic Sedimentary Rock (primarily SiO2)
Limestone with Fossil Fragments
Bioclastic Carbonate Rock (CaCO3)
Sandstone (River Cobble)
Clastic Sandstone (SiO2 with accessory minerals)
Limestone
Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Sandstone
Arenite
Limestone
Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Sandstone
Arenite (SiO2 based)
Sandstone (with banding)
Arenite (primarily SiO2)
Sandstone (Pebble)
Arenite (primarily SiO2)
Limestone (specifically Chalky Limestone)
Calcium Carbonate (CaCO3 / Calcite)
Limestone
Limestone (Calcium Carbonate - CaCO3)
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
Sandstone
Arenite (composed primarily of SiO2)
Dolomite or Limestone (Carbonate Rock)
CaMg(CO3)2 (Dolomite) or CaCO3 (Limestone / Calcite)
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
Sandstone
Arenite (typically SiO2 + others)
Limestone (specifically Crushed Limestone/Calcictic)
Calcium Carbonate (CaCO3)
Sandstone (specifically Red Sandstone)
Arenite (primarily Quartz, SiO2)
Sandstone
Arenite
Sandstone (Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
Limestone
Calcium Carbonate (CaCO3)
Limestone (Decorative Gravel)
Calcium Carbonate (CaCO3)
Sandstone
Arenite
Limestone (specifically Fossiliferous Limestone)
Calcium Carbonate (CaCO3)
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
Limestone
Calcium Carbonate (CaCO3)