Quartz River Pebbles
Silicon Dioxide (SiO2)
sedimentary
Category
Sedimentary (Chemical)
Browse sedimentary (chemical) specimens identified by the Rock Identifier community.
Slate
Slate (Metamorphic Rock)
metamorphic
Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Amber
Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O
Organic mineraloid
Agate (Dyed High-Grade Polished Slice)
Silicon dioxide (SiO2), Chalcedony crystal variety
mineral
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Aragonite Star Cluster (or Aragonite Sputnik)
Aragonite (Orthorhombic Calcium Carbonate, CaCO3)
mineral
Sulfur
Native Sulfur (S8)
mineral
Azurite in Gossan
Azurite (Cu3(CO3)2(OH)2) in Limonite/Goethite matrix
mineral
Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
man-made rock (sedimentary analogue)
Greywacke (likely)
Greywacke (a type of sandstone)
Sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Limonite-stained Quartz / Quartzite
Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)
sedimentary or metamorphic
Greenstone
Metamorphosed Mafic Igneous Rock
metamorphic
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Banded Agate (specifically Sardonyx)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Magnetite
Magnetite (Fe3O4)
Mineral
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Blue Opal Inlay (Simulated/Lab-created)
Hydrated Amorphous Silica (SiO2·nH2O) with polymer resin
mineraloid
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Flint
Chert (a form of cryptocrystalline quartz, chemical formula SiO₂)
Mineral
Quartzite
Quartzite
Metamorphic rock
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite (River Cobble)
Quartzite (predominantly SiO2)
metamorphic
Quartzite (Gold/Tan River Cobble)
Quartzite (composed primarily of crystalline SiO2)
metamorphic
Kyanite
Kyanite (Al2SiO5)
Mineral
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)
sedimentary
Acicular Azurite (indicated by deep blue, fibrous/fuzzy appearance)
Azurite (Copper Carbonate Hydroxide) - Cu3(CO3)2(OH)2
mineral
Chert / Flint
Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂
Mineral
Weathered Quartzite or Chert Pebble
Silicon Dioxide (SiO2)
metamorphic or sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Hematite (Fe2O3)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Chert (Flint)
Chert (microcrystalline quartz)
sedimentary
Red Jasper (beads)
SiO₂ (Silicon Dioxide)
Mineral, variety of chalcedony (microcrystalline quartz)
Granodiorite
Granodiorite (containing Quartz, Plagioclase, Orthoclase, Biotite/Hornblende)
igneous
Quartz (Beach Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite with Iron Mineral Banding
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining
metamorphic
Gossan with Copper Carbonate (Chrysocolla/Malachite)
Ferruginous Oxide (Gossan) with Cu2CO3(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)
Mineral/Sedimentary Interface