Chert (varieties include Flint and Jasper)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Category
Marble
Browse marble specimens identified by the Rock Identifier community.
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
sedimentary
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Limestone (specifically fossiliferous/skeletal limestone)
Calcium Carbonate (CaCO3)
sedimentary
Rough Diamond
Diamond (pure Carbon, C)
mineral
Hag Stone
Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)
sedimentary
Chert (varieties include Jasper or Flint)
Chert (Microcrystalline Silica, formula: SiO2)
sedimentary
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
sedimentary
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary
Chert
Chert (Microcrystalline Silica, SiO2)
sedimentary
Beach Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Brachiopod Fossil (Spiriferid)
Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)
sedimentary (fossilized organic remain)
Chert (with Quartz veins)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (specifically Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites (Extinct genus of Tabulate Coral)
sedimentary
Ironstone (Limonitic Shale)
Ferruginous Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Fossilized Oyster Shell
Gryphaea or Crassostrea fossil (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone (Coquina / Shell Conglomerate)
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Jasper (specifically Chert/Ironstone)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Yellow Chert
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert (River Stone/Cobble)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina
Biogenic Limestone (Calcite/Aragonite)
sedimentary
Chert (Brecciated River Cobble)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Serpentine
Antigorite / Lizardite / Chrysotile (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Oolitic Chert
Oolitic Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Crushed Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Chert (with Lichen)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Diamond (Pure Carbon, C)
mineral
Red Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Baltic Amber
Succinite (Polmerized conifer resin)
mineraloid
Coquina
Bioclastic Limestone (CaCO3)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Siltstone Pebble
Siltstone (composed of hydraulic-sorted silt-sized particles)
sedimentary
Fossilized Shark Tooth (Fragment) in Matrix
Elasmobranchii (subclass)
fossil
Glauconitic Siltstone / Mudstone
Glauconitic Pelite
sedimentary
Fossiliferous Limestone
Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)
fossil
Limestone River Cobble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary