Limestone
Calcium Carbonate (CaCO3)
Category
Browse marble specimens identified by the Rock Identifier community.
Limestone
Calcium Carbonate (CaCO3)
Chert (Flint)
Chert (Cryptocrystalline Silicon Dioxide, SiO2)
Honeycomb Coral Fossil
Favosites (extinct genus of tabulate coral)
Chert (and Jasper pebble)
Microcrystalline Silica (SiO2)
Chert (Jasper/Limonitic Chert)
Silicon dioxide (SiO2)
Gastropod Internal Mold (Steinkern)
Class Gastropoda fossil mold (Phylum Mollusca)
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group: Chrysotile, Lizardite, and Antigorite)
Basalt Pebble
Basalt (Extrusive Mafic Igneous)
Sandstone (Ferruginous)
Clastic Sedimentary Rock (Litharenite)
Chert (Serpentinized)
Silicon Dioxide (SiO2) with mineral staining
Banded Chert
Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)
Mookaite Jasper
Siliceous (chert) sedimentary rock, a form of Jasper
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Peridot (likely, given the color and bead form)
Olivine, variety Peridot (Mg,Fe)2SiO4
Limestone Pebble
Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Siltstone
Siltstone (primarily SiO2 with clay minerals)
Chert (Nodular Chert)
Microcrystalline Quartz (SiO2)
Fossilized Tabulate Coral in Sandstone/Limestone
Favosites (Order: Tabulata)
Fossil Shark Tooth
Odontaspididae (likely Carcharias sp.)
Chert (variations include Flint)
Silicon Dioxide (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Serpentine
Antigorite/Chrysotile group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4)
Chert (Beach Pebble)
Silicon Dioxide (SiO2)
River Cobble (likely Serpentinite or Greenstone)
Serpentinite / Greenschist facies rock
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
Fossilized Brachiopod
Brachiopoda (Phylum), likely Order Spiriferida or Rhynchonellida
Coquina or Coral Fossil
Biogenic Limestone (Calcite/Aragonite)
Limestone
Calcium Carbonate (CaCO3)
Graywacke (River Cobble)
Lithic Sandstone (Graywacke)
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Oyster Shell Fragment
Crassostrea virginica (or related Bivalvia)
Limestone with Lichen/Moss
Calcium Carbonate (CaCO3)
Fossilized Gryphaea (Devil's Toenail)
Gryphaea arcuata (Bivalvia: Gryphaeidae)
Chert
Microcrystalline Quartz (SiO2)
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
Chert (and Chert Breccia)
Silicon Dioxide (SiO2)
Serpentine
Serpentine subgroup (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
Limestone
Calcium Carbonate (CaCO3)
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)