Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Category
Not A Rock (Man Made Polymer)
Browse not a rock (man made polymer) specimens identified by the Rock Identifier community.
Learn about Not A Rock (Man Made Polymer) in the encyclopedia
View all →
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Wollastonite
Calcium Inosilicate, CaSiO3
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Unidentified gray stone/concrete-like fragment
Indeterminate; likely a fine-grained carbonate or cementitious geological fragment
sedimentary
Amber
Succinite (C10H16O)
mineral
Chalk
Calcium carbonate (CaCO3)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Possible basalt or iron-rich slag
Basalt (tentative; identification uncertain from image)
igneous
Quartzite pebble
Quartzite (SiO2)
metamorphic
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinates (fossilized tree resin), approximately C10H16O
organic gemstone
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
sedimentary
Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Polished amber
Fossilized tree resin (primarily organic polymerized diterpenes)
gemstone
Natural Pearl
Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3
mineral
Mica Schist
Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)
metamorphic
Amber
Succinite (C10H16O)
mineral
Chalk
Carbonate rock (mainly CaCO3)
sedimentary
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Fossiliferous Limestone with Crinoid Stem
Sedimentary Rock with Crinoidea Fossil
fossil
Basalt
Basalt (Mafic volcanic rock)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Chert (and Agate/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
N/A (Non-Geological Specimen)
N/A
Sandstone
Arenite (SiO2 primarily)
sedimentary
Aura Quartz (Anomalously Coated Quartz)
Silicon Dioxide (SiO2) treated with vaporized metals
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Pumice or vesicular volcanic tuff
Pumice: highly vesicular volcanic glass, chiefly rhyolitic to dacitic; possible tuff: lithified ash and pumice fragments
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
igneous
Quartz Sandstone Pebble
Sandstone (SiO2 dominated)
sedimentary
Tumbled brown chalcedony or agate
Microcrystalline quartz (SiO₂), likely chalcedony; possibly iron-stained jasper or agate
gemstone
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Granite (Silicic Intrusive Igneous Rock)
Igneous
Chert (Flint / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous