Limestone
Calcium Carbonate (CaCO3)
Category
Browse marble specimens identified by the Rock Identifier community.
Limestone
Calcium Carbonate (CaCO3)
Peridot
Olivine (Mg, Fe)₂SiO₄
Fossilized Brachiopod
Brachiopoda (likely Order Spiriferida or Productida)
Sandstone
Arenite
Sandstone (Pebble)
Arenite (SiO2 based)
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
Diamond in Kimberlite
Diamond (C in Kimberlite)
Chert (Yellow/Tan)
Microcrystalline Quartz (SiO2)
Caribbean Calcite
Aragonite and Calcite (CaCO3)
Chert (Flint)
Chert (Microcrystalline or cryptocrystalline Quartz, SiO2)
Fossilized Rugose Coral
Rugosa (Order Rugosa, typically fossilized in Limestone)
Pearl (as a Biogenic Mineral)
Calcium Carbonate (mostly Aragonite) with Conchiolin; CaCO3
Chert (Jasper)
Silicon Dioxide (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Chert (often called Flint)
Silicon Dioxide (SiO2)
Chert (or Jasper)
Microcrystalline Quartz (SiO2)
Chert Nodules
Microcrystalline Quartz (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic Inclusions
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Basalt with Quartz Veining
Mafic Volcanic Rock with Silicate Micro-veins
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
Diamond (or Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
Banded Chert
Microcrystalline Quartz (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Sandstone and Quartzite Specimens
SiO2 with varying mineral/clastic inclusions
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
Coquina or Fossiliferous Limestone
Fossiliferous Limstone (CaCO3)
Natural Diamond (Faceted)
Diamond (pure carbon crystal, C)
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
Chert (Flint)
Microcrystalline silica (SiO2)
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
Diamond (Cut Gemstone)
Carbon (C)
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
Fossilized Solitary Rugose Coral
Order Rugosa (commonly Horn Coral)
Diamond (Faceted)
Carbon (C)
Banded Chert
Silicon Dioxide (SiO2)
Glauconitic Sandstone
Glauconitic Sandstone (Greensand)
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Serpentine
Antigorite, Lizardite, or Chrysotile; (Mg, Fe)3Si2O5(OH)4