Sandstone
Arenite (primarily SiO2)
sedimentary
Category
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Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Rose Quartz
Quartz (SiO₂), specifically a variety of Quartz
Mineral
Druzy Quartz on Agate/Chert
Silicon Dioxide (SiO2)
mineral
Quartz (in matrix)
Quartz (SiO₂)
mineral
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Jasper with Agate Inclusions
Jasper (Silicon Dioxide, SiO2) with Chalcedony/Agate
sedimentary
Sandstone (likely Calcareous or Quartz-rich)
Arenite (SiO2 based typically)
sedimentary
Granitic Pegmatite (Muscovite and Quartz)
Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)
igneous
Granite (with Almandine Garnet inclusions)
Granite composed primarily of Quartz (SiO2), K-Feldspar (KAlSi3O8), and Almandine Garnet (Fe3Al2(SiO4)3)
igneous
Liesegang Banded Sandstone (Wonderstone)
Ferruginous Sandstone with Liesegang Rings
sedimentary
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Jasper Breccia
Silicon Dioxide (SiO2) - Brecciated Microcrystalline Quartz
sedimentary
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Rough Corundum (likely Sapphire or Common Corundum)
Aluminum oxide (Al2O3)
mineral
Granite
Phaneritic Plutonic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz (likely a clear or rock crystal variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Common Green Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
mineral
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Iron Meteorite
Iron Meteorite (primarily Kamacite and Taenite, Fe-Ni alloys)
mineral
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Agatized Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt with Agate/Chalcedony Infills
Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)
igneous
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Metamorphic
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Man-made Ceramic / Clay Figurine
Aluminosilicate Ceramic (Processed Clay)
Synthetic (not a rock or mineral)
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
mineral
Sandstone
Arenite (SiO2 principal component)
sedimentary
Carnelian
Carnelian (Silicon Dioxide: SiO2)
mineral
Banded Agate (specifically Carnelian Agate slice)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Chalcedony (Common Opal or Agate variant)
Silicon Dioxide (SiO₂)
mineral
Granite (specifically Pink or Alkali Feldspar Granite)
Felsic Plutonic Rock (primarily SiO2 with KAlSi3O8)
igneous