Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Mineral (Synthetic Paper And Ink Polymorph)
Browse mineral (synthetic paper and ink polymorph) specimens identified by the Rock Identifier community.
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petoskey Stone (Fossilized Rugose Coral)
Hexagonaria percarinata (Calcium Carbonate, CaCO3)
sedimentary
Cubic Zirconia
Zirconium dioxide (ZrO2)
gemstone
Fossilized Coral (Petoskey Stone / Favosites)
Hexagonaria percarinata / Favosites sp. (Calcite, CaCO3)
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Orthoceras Fossil
Orthoceras sp. (Extinct genus of nautiloid cephalopod)
fossil
Chalk (Sedimentary Limestone)
Calcite (CaCO3)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Tumbled dark banded stone, possibly indigo gabbro or banded basalt
Indeterminate; likely fine-grained mafic rock composed mainly of plagioclase and pyroxene, with possible amphibole or alteration minerals
igneous
Sandstone Cobble
Arenite (Secondary classification based on grain size)
sedimentary
Lapis Lazuli (Tumbled Stone)
Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (predominantly Lazurite)
metamorphic
Cardstock (Paper)
Cellulose (C6H10O5)n
sedimentary (man-made)
Slate
Foliated Metamorphic Rock
metamorphic
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Diamond
Natural Diamond (Carbon, C)
gemstone
Conglomerate
Conglomeratic Sandstone / Polymictic Conglomerate
sedimentary
White Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineraloid
Coal (Anthracite or Bituminous)
Carbonaceous sedimentary rock (Carbon)
sedimentary
Amber Dragonfly Brooch
Succinited (Baltic Amber)
fossil
Lapis Lazuli
Lapis lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Painted River Rock
Anthropogenic-modified Siliciclastic Sedimentary Rock
Sedimentary
Cubic Zirconia (Jewelry Setting)
Cubic Zirconia (ZrO2)
gemstone
Colorless faceted gemstone (likely cubic zirconia)
Cubic zirconia, zirconium dioxide (ZrO₂); possibly synthetic quartz or glass imitation
gemstone
Chalk
CaCO3 (Calcium Carbonate)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Petoskey Stone (Fossilized Rugose Coral)
Hexagonaria percarinata
fossil
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Marble (White)
Metamorphosed Limestone (mainly CaCO3)
metamorphic
Cubic Zirconia (Faceted Gemstone)
Zirconium dioxide (ZrO2)
gemstone
Crushed Limestone
Limestone (CaCO3)
sedimentary
Granite Cobble
Felsic intrusive igneous rock (composition: SiO₂ with KAlSi₃O₈, NaAlSi₃O₈, and CaAl₂Si₂O₈)
igneous
Cubic Zirconia (Faceted)
Zirconium dioxide (ZrO2)
gemstone
Pink faceted gemstone, likely synthetic ruby or pink sapphire
Corundum (Al₂O₃), possibly chromium-colored ruby; synthetic origin likely
gemstone
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant
gemstone
Colorless faceted gemstone, likely cubic zirconia
Cubic zirconia (synthetic zirconium dioxide, ZrO₂); possibly colorless quartz or laboratory diamond
gemstone
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Dyed Purple Agate Sliced Tablet
Silicon Dioxide (SiO2), variety Chalcedony
gemstone