Fossil Shell
Invertebrate fossil (Mollusca)
fossil
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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Likely quartz-rich stone, possibly milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Blue-green faceted gemstone, likely turquoise or treated turquoise
Turquoise: hydrated copper–aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification is uncertain from the image
gemstone
Sandstone (Quartzose Pebble)
Arenite (SiO2)
sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Diamond engagement ring
Diamond, crystalline carbon (C)
gemstone
Black Opal Ring (Carved Opal)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Tumbled green stone, likely serpentine or aventurine
Indeterminate; possible serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or green quartzite/aventurine (SiO₂)
mineral
Red coral cabochon (likely dyed or reconstructed coral)
Corallium rubrum or other calcareous coral; chiefly aragonite (CaCO₃)
gemstone
Sandstone (likely Quartzite-rich)
Arenite (primarily SiO2)
sedimentary
Concretion
Sedimentary Concretion
sedimentary
Larimar and Fossil Coral
Pectolite (NaCa2Si3O8(OH)) and Hexagonaria/Petoskey Stone
mineral and sedimentary
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2)
mineral
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Jasper with Hematite
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
White limestone or chalky carbonate rock
Calcite-rich limestone; possibly chalk (CaCO₃)
sedimentary
Lapis Lazuli (Carved)
Lazurite-rich metamorphic rock (approx. (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Sedimentary Breccia
Clastic Breccia (CaCO3/SiO2 matrix)
sedimentary
Small brown-gray mineral fragment
Indeterminate; possibly weathered quartz-, feldspar-, or iron-oxide-bearing rock
mineral
Weathered iron-rich rock, possibly ironstone or altered basalt
Indeterminate; likely ferruginous basalt/ironstone containing hematite-goethite and silicate minerals
igneous
Rounded dark-gray cobble, likely basalt
Basalt (fine-grained mafic volcanic rock; identification is provisional from the image)
igneous
Gold
Native Gold (Au)
mineral
Quartz-rich metamorphic pebble, likely quartzite
Quartzite, composed predominantly of quartz (SiO₂)
metamorphic
Possible basaltic rock or meteorite candidate
Likely vesicular basalt; meteorite identification cannot be confirmed visually
igneous
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Baroque cultured pearl necklace
Pearl: nacre composed mainly of aragonite (CaCO₃) and conchiolin
gemstone
Sandstone
Arenite (SiO2 composition primarily)
sedimentary
Sandstone (Quartzite-rich Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Sandstone or Mudstone
Sedimentary Rock
sedimentary
Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Generic Pebble
Lithic Fragment
sedimentary
Ruby (in a ring setting)
Corundum (Al2O3:Cr)
gemstone
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Gold Nugget
Native Gold (Au)
mineral
Aragonite (Botryoidal/Coralloidal variety)
Aragonite (CaCO3)
mineral
Gold Nugget
Native Gold (Au)
mineral
Lapis Lazuli
Complex silicate rock containing lazurite, calcite, and pyrite
gemstone
Quartz-rich rock (possibly quartzite)
Quartzite, composed mainly of quartz (SiO₂)
metamorphic
Sandstone
Arenite
sedimentary