Chert (specifically Gray/Tan Bedded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Base), Then Artificial
Browse sedimentary (base), then artificial specimens identified by the Rock Identifier community.
Learn about Sedimentary (Base), Then Artificial in the encyclopedia
View all →
Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Sandstone (lithic)
Lithic Wacke / Arenite
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Siltstone
Siltstone (clastic sedimentary rock)
sedimentary
Limestone River Cobble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Limonitic/Arkose)
Sandstone (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Limestone Cobble
Sedimentary Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone (Ocherous)
Calcium Carbonate (CaCO3) with Iron Oxide (Limonite)
sedimentary
Zebra Jasper
Silicon Dioxide (SiO2) with various inclusions
metamorphic/sedimentary
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Vesicular basalt (likely amygdaloidal basalt)
Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, clinopyroxene, and commonly olivine; vesicles are partly mineral-filled amygdules.
igneous
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Pebble
Lithified rock fragment / Sedimentary clast
sedimentary
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Iron-stained Quartz
Silicon Dioxide with Limonite (SiO2 + FeO(OH)·nH2O)
mineral
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Limestone Fragment
Sedimentary rock (primarily Calcium Carbonate, CaCO3)
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Siltstone
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Greywacke)
Arenite/Greywacke (SiO2 major)
sedimentary
Opal (in Jewelry Setting)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Granitic Gneiss
Gneiss (Metamorphic rock predominantly containing quartz, K-feldspar, and plagioclase)
metamorphic
Chert (River Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Graywacke (River Cobble)
Lithic Sandstone (Graywacke)
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
sedimentary
Limestone ( weathered ) / Chert Nodular Rock
Sedimentary rock (primarily Calcium Carbonate, CaCO3, with Microcrystalline Quartz, SiO2)
sedimentary
Sandstone Cobble with Iron Staining
Arenite with Limonite/Hematite staining
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Calcite (CaCO3) matrix with biogenic fragments
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Vesicular Limestone with Borings
Fossiliferous Calcarenite (Calcium Carbonate, CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary