Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
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Quartzite (Iron-stained)
Quartzite (SiO2 with Fe2O3 staining)
metamorphic
Vesicular basalt (possibly amygdaloidal basalt)
Basalt, chiefly plagioclase feldspar and pyroxene, with possible olivine and secondary mineral infillings
igneous
Sandstone (Yellow/Siltstone variant)
Arenite (SiO2 primarily)
sedimentary
Lava Rock (Basalt)
Basalt (extrusive igneous rock)
igneous
Blue Lace Agate
Cryptocrystalline Quartz (SiO2) with trace minerals
sedimentary
Quartz geode / iron-stained quartz vein rock
Quartz (SiO₂), likely with iron oxides and minor feldspar or host-rock minerals
mineral
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Red Sandstone
Arenite
sedimentary
Vesicular basalt (scoriaceous basalt)
Basalt, primarily plagioclase, pyroxene, and iron-rich olivine; vesicular variety may be termed scoria
igneous
Quartz-rich breccia or quartzite with iron-oxide veining
Microcrystalline to granular SiO₂ (quartz), with hematite/goethite and minor feldspar or mica
metamorphic
Weathered quartz-rich rock fragment
Likely quartz-bearing feldspathic rock; exact identification requires testing
mineral
Orange chalcedony or weathered quartz pebble
Microcrystalline quartz, SiO₂; possibly iron-oxide-stained chalcedony
mineral
Granite
Intrusive Felsic Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock (composed of SiO2 grains)
sedimentary
Red Sandstone
Arenic rock (composed mainly of SiO2 with Fe2O3)
sedimentary
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Sandstone
Arenite
sedimentary
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Sandstone
Arenicola (comprising mostly Quartz, SiO2)
sedimentary
Charoite
Charoite (Complex silicate mineral rock)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Sandstone
Arenite (lithic or quartz sandstone)
sedimentary
Quartz (Milky or Clear variety)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 principal component)
sedimentary
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Gneiss
High-grade regional metamorphic rock
metamorphic
Sandstone (Quartzose)
Arenite
sedimentary
Sandstone (likely Quartzite-rich)
Arenite (primarily SiO2)
sedimentary
Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Polished orange agate/jasper cabochon
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide coloration; exact variety uncertain
mineral
Moldavite
Moldavite (Silica-rich glass, SiO2 + Al2O3)
tektite
Sandstone (Quartzose)
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Quartzite
Quartzite (SiO2-rich metamorphic rock)
metamorphic
Sandstone with Vitrinite/Coal inclusions
Arenite with Carbonaceous inclusions
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary