Sandstone
Arenite (SiO2 principal component)
sedimentary
Category
Mineraloid Like Synthetic Material
Browse mineraloid like synthetic material specimens identified by the Rock Identifier community.
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Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Granite-like igneous rock
Likely medium-grained granite or granodiorite; quartz–feldspar–mica aggregate
igneous
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Polished black-and-white banded stone, likely tourmalinated quartz or zebra jasper
Quartz (SiO₂) with black tourmaline (schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄), or quartz-rich zebra jasper
mineral
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Red Sandstone (Siltstone pebble)
Arenite / Siltstone (Silicon dioxide based with hematite impurities)
sedimentary
Granite Cobble
Phaneritic Felsic Intrusive Rock (Granite)
igneous
Thunderegg (specifically a Jasper/Agate-filled Geode nodule)
Silicon Dioxide (SiO2) within Rhyolitic Matrix
igneous
Carnelian (Orange Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Massive Quartz
Silicon dioxide (SiO2)
mineral
Chert (Common Opal or Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Fossilized Bivalve Shell
Bivalvia (Phylum Mollusca)
fossil
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Dinosaur Bone
Agatized Dinosaur Bone
sedimentary/fossil
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
sedimentary
Red Granite
Phaneritic Plutonic Rock (High Potassium Feldspar)
igneous
Limonite (Ironstone Concretion)
Limonite (FeO(OH)·nH2O)
mineral/sedimentary
Chalcedony Pebble / Rough Agate
Silicon Dioxide (SiO2)
mineral
Geode or Concretion
Silica-rich Concretion or Unopened Geode (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Diamond
Carbon (C)
mineral
Carborundum
Silicon Carbide (SiC)
mineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Sandstone
Arenite
sedimentary
Quartzite (with Iron Staining)
Metamorphosed Sandstone (mainly SiO2 with Fe2O3/FeOOH impurities)
metamorphic
Gneiss
Gneiss
metamorphic
Red Sandstone
Arenite with Hematite (Fe2O3)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Travertine
Calcareous tufa (CaCO3)
sedimentary
Milky Quartz/Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt
igneous
Chert with Iron Inclusions
Microcrystalline Quartz (SiO2) with Hematite/Limonite
sedimentary