Sandstone Pebble (River Rock)
Arenite (primarily SiO2)
sedimentary
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Metamorphic (Base Substrate) in the encyclopedia
View all →
Greywacke (Sandstone)
Lithic wacke
sedimentary
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Chert (and/or River Pebble)
Microcrystalline silica (SiO2)
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Crushed Limestone
Sedimentary Calcite/Dolomite Rock (CaCO3)
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Muscovite Mica (on Quartz Matrix)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Silicified Gastropod Fossil (Agatized Fossil)
Gastropoda (Class) preserved in Chalcedony/Quartz (SiO2)
sedimentary
Fossiliferous Limestone
CaCO3 (with biological inclusions)
sedimentary
Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Fossiliferous Limestone
Calcite-rich sedimentary rock with invertebrate fossils (CaCO3)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
River Gravel
Polymictic Gravel / Detrital Rock Aggregate
sedimentary
Pebble / Gravel Fragment
Clastic Rock Fragment
sedimentary
Coquina / Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Hydrothermal Quartz or Quartzite (SiO2)
metamorphic
Quartzite (Milky Quartz Cobble)
Silicon Dioxide (SiO2)
Metamorphic
Dalmation Stone (often called Dalmatian Jasper)
Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite
igneous
Conglomerate
Clastic Sedimentary Rock
sedimentary
Banded River Stone (Greywacke or Siltstone subtype)
Sedimentary Banded Siltstone
sedimentary
Conglomerate (or Breccia)
Clastic Sedimentary Rock
sedimentary
Sandstone (likely Graywacke or Lithic Sandstone)
Clastic Sedimentary Rock
sedimentary
Mica Schist
Mica Schist (predominantly Muscovite or Biotite series)
metamorphic
Banded Schist
Mica Schist
metamorphic
Mica Schist
Mica Schist (Predominantly Muscovite/Biotite)
metamorphic
Mica Schist
Muscovite/Biotite Schist
metamorphic
Quartz with Mica (Gneissic or Pegmatitic origin)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(F,OH)2)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Mica Schist
Mica Schist
metamorphic
Quartz-veined Sedimentary Rock
Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Siltstone
Siltstone (primarily SiO2 with Al2O3)
sedimentary