Coquina / Shell Limestone
Coquina (Bioclastic Limestone)
sedimentary
Category
Marble
Browse marble specimens identified by the Rock Identifier community.
Chert (Flint variety)
Chert (SiO2)
sedimentary
Crushed Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Diamond (in jewelry setting)
Diamond (Native Carbon, C)
mineral
Diamond (Colorless/White)
Carbon (C)
mineral
Kimberlite with Diamond
Kimberlite (Porphyritic Peridotite)
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (chemical formula: C10H16O)
Organic Gemstone (not a rock or mineral)
Chert (containing Quartz veins)
Chert (SiO2)
sedimentary
Black Limestone with Calcite Veins
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)
metamorphic
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina / Limonite-stained Limestone
Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Green River Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl (Imitation or Cultured)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
Mineraloid (Organic)
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Diamond
Carbon (C)
mineral
Diamond (likely facet or crystal shard)
Diamond (C)
mineral
Diamond (or Diamond Simulant)
Carbon (C) or Zirconium dioxide (ZrO2) for CZ
gemstone
Banded Iron Formation (BIF)
Banded Iron Formation (predominantly Hematite and Chert)
sedimentary
Serpentinite
Serpentinite (containing Antigorite, Lizardite, and/or Chrysotile)
metamorphic
Fossiliferous Limestone
Fossiliferous Limestone (Sedimentary Rock)
fossil
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, or Chrysotile)
metamorphic
Orthoceras fossil in limestone
Orthoceras regulare (extinct nautiloid cephalopod)
fossil
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Horn Coral Fossil
Order Rugosa
fossil
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
River Stone (Limestone)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (Mookaite style)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Greywacke (Sandstone)
Lithic wacke
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Sandstone (lithic wake/graywacke variety)
Arenite/Greywacke (SiO2 with lithic fragments)
sedimentary