Sandstone (Quartzose)
Arenite (SiO2 principal composition)
sedimentary
Category
Sedimentary Rock Or Mineral (Depending On Origin And Purity)
Browse sedimentary rock or mineral (depending on origin and purity) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock Or Mineral (Depending On Origin And Purity) in the encyclopedia
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Polished turquoise cabochon jewelry (likely composite or stabilized turquoise)
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Sandstone
Clastic sedimentary rock
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Diamond and Gold Jewelry
Carbon (Diamond) / Au (Gold)
gemstone
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Dark metamorphic cobble, likely slate or phyllite
Foliated metamorphic rock, probably carbonaceous slate/phyllite; exact identification requires testing
metamorphic
Jasper (Mookaite style)
Jasper (Silica-rich Microcrystalline Quartz, SiO2)
sedimentary
Ruby (Corundum)
Aluminum oxide (Al2O3) with Chromium traces
mineral
Sandstone
Arenite (SiO2 principal component)
sedimentary
Ruby
Corundum (Al2O3)
gemstone
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 impurities)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Sandstone (Weathered Fragment)
Clastic Sedimentary Rock
sedimentary
Gold Nuggests
Native Gold (Au)
mineral
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 + Au)
metamorphic
Blue Sapphire and Diamond (Set in Metal)
Corundum (Al2O3) and Diamond (C)
mineral
Gold Nugget
Native Gold (Au)
mineral
Conglomerate (Puddingstone)
Conglomerate (specifically, clastic sedimentary rock)
Sedimentary
Milky Quartz with Iron Staining
Crystalline Silicon Dioxide (SiO2)
mineral
Granite Cobble
Granitic intrusive igneous rock (Quartz, Feldspar, Mica)
igneous
Possible flint (dark chert) nodule
Microcrystalline quartz (SiO₂), commonly called chert or flint
sedimentary
Unidentified polished dark gemstone cabochon
Possibly hematite, obsidian, jet, or dark agate; image insufficient for a definitive identification
gemstone
Natural Freshwater Pearl
Calcium Carbonate (Aragonite and Calcite), CaCO3
gemstone
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Diamond
C (Carbon)
mineral
Gold
Native Gold (Au)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Quartz (Smoky/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Blue Sapphire
Corundum (Al2O3 with trace amounts of Fe and Ti)
gemstone
Pyrite in Host Rock
Iron Disulfide (FeS2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Graphite-rich schist (probable graphite flake)
Graphite (C) in graphitic schist; commonly with quartz, mica, and feldspar
metamorphic
Iridescent opal-like specimen
Likely common opal (hydrated amorphous silica, SiO₂·nH₂O), possibly treated or synthetic
gemstone
Fossilized bivalve shell
Recrystallized calcium-carbonate shell, commonly fossil oyster or clam (Bivalvia)
fossil