Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)
Category
Not A Rock (Synthetic Material)
Browse not a rock (synthetic material) specimens identified by the Rock Identifier community.
Learn about Not A Rock (Synthetic Material) in the encyclopedia
View all →
Dark gray basalt or andesite cobble
Fine-grained mafic to intermediate volcanic rock; commonly plagioclase feldspar, pyroxene, and possibly olivine
igneous
Greenstone
Metamorphic mafic rock (greenschist facies)
metamorphic
Pink Granite / Potassium Feldspar with Quartz
Granite (composed mainly of Orthoclase KAlSi3O8 and Quartz SiO2)
igneous
Fossiliferous Limestone with Crinoid Stem fragment
Calcite (CaCO3) containing Crinoidea fossils
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Nephrite Jade
Nephrite
Mineral/Rock
Gravelly, weathered sediment (likely glacial till)
Unconsolidated diamicton; mixed lithologies, commonly including quartz, feldspar, and weathered silicate rock fragments
sedimentary
Dark fine-grained rock, likely basalt
Basalt; chiefly plagioclase feldspar and pyroxene, commonly with olivine and iron oxides
igneous
Sandstone River Cobble
Arenite (SiO2 based)
sedimentary
Red Tuff / Sandstone
Rhyolitic Tuff / Pyroclastic Volcanic Rock
igneous
Flagstone
Sedimentary Sandstone / Flagstone
sedimentary
Quartzite River Rock (with Quartz Vein)
Quartzite (SiO2)
metamorphic
Sandstone (Red)
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Red Sandstone
Arenite (composed primarily of Quartz and Iron Oxide)
sedimentary
Fossil Shell (Bivalve)
Class Bivalvia (fossilized)
fossil
Jasper
Silicon dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite (Iron-stained)
Quartzite (SiO2 with Fe-oxides)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Veined quartz-bearing metamorphic rock
Likely quartzite or siliceous schist with iron-oxide staining
metamorphic
Brecciated quartz-rich rock, possibly silicified breccia
Silica-rich breccia; chiefly microcrystalline quartz (SiO₂), with possible calcite and iron-oxide staining
sedimentary
Brecciated jasper (likely ocean jasper or rhyolitic jasper)
Silica-rich volcanic breccia composed mainly of microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and possible feldspar
igneous
Quartz-rich granitic rock, possibly pegmatite
Granite/pegmatitic granite; chiefly quartz (SiO₂), feldspar, and mica
igneous
Travertine
Terrestrial Sedimentary Calcite (CaCO3)
sedimentary
Polished ocean jasper (orbicular jasper)
Microcrystalline quartz/chalcedony (SiO₂) with iron oxides and assorted alteration minerals
mineral
Chert (Common Opal/Jasper variety)
Microcrystalline Quartz (SiO2) with hydration
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Jasper Conglomerate (Puddingstone)
Jasper Conglomerate (Siliceous Sedimentary Rock)
sedimentary
Sandstone
Arenite
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone (Red/Brown Variety)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary