Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Category
Sedimentary Rock (Specifically A Concretion Or Possibly A Geode)
Browse sedimentary rock (specifically a concretion or possibly a geode) specimens identified by the Rock Identifier community.
Quartz (Gravel fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Mafic Igneous Rock (composed of plagioclase feldspar and pyroxene)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Pumice
Pumicite (Amorphous Volcanic Glass)
Igneous
Basalt
Extrusive Mafic Igneous Rock
igneous
Gastropod Fossil (Snail Steinkern)
Class Gastropoda fossil, composed of Calcium Carbonate (CaCO3)
sedimentary
Chert / Flint
Cryptocrystalline quartz (SiO2)
Sedimentary
Carnelian Agate
Silicon Dioxide (SiO₂), a variety of Chalcedony
mineral
Pumice (Vesicular Rhyolite/Andesite)
Pumice (a highly vesicular volcanic glass/extrusive igneous rock)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz / Limestone Gravel
SiO2 (Silicon Dioxide) and CaCO3 (Calcium Carbonate)
igneous and sedimentary mixture
Sandstone with Quartz Veins
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Pumice
Pumice (extrusive volcanic rock)
igneous
Basalt (Water-worn pebble)
Basalt (Mafic Extrusive Rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Basalt
Mafic extrusive volcanic rock (composed primarily of Plagioclase feldspar and Pyroxene)
igneous
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) with polymer resins
Sedimentary-like (Industrial Composite)
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Pumice
Pumice (Vesicular Rhyolite/Dacite)
igneous
Basalt
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Pumice
Extrusive volcanic rock (Vesicular Rhyolite/Dacite/Andesite)
igneous
Basalt with Magnetite inclusions
Basalt (Mafic silicate rock) potentially containing Magnetite (Fe3O4)
igneous
Scoria
Vesicular Basalt / Scoria (Mafic volcanic rock)
igneous
Chert
Chert (variant of microcrystalline quartz)
Sedimentary
Quartz (specifically Milky/Gray Quartz vein)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt (Road Aggregate)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Chert (specifically Brown Chert or Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Jasper or Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (specifically Yellow Jasper and Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (specifically Flint or Common Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint or Common Chert)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Chert (specifically Pink Chert or Jasperized Chert)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline silica (SiO2)
sedimentary
Chert (specifically Blue or Grey Chert/Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Jasper (specifically Yellow or Picture Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (specifically Yellow Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Jasper (specifically Fancy or Polychrome Jasper)
Silicon Dioxide (SiO2) - Chalcedony
Sedimentary