Chert (Lightly weathered variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Category
Man Made Material (Anthro Lithic Product)
Browse man made material (anthro lithic product) specimens identified by the Rock Identifier community.
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Limonite (Iron Ore)
Hydrous Iron Oxide (goethite, lepidocrocite)
Mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Chert (Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
Chert (varietal Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Common Variety, Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Graywacke or Arkose)
Clastic Sedimentary Rock (primarily SiO2 with various lithic fragments)
sedimentary
Raw Diamond
Carbon (C)
gemstone
Chert (Flint/Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Chert (Common Opal/Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond (in jewelry setting)
Carbon (C)
mineral
Red Sandstone
Arenite (Fe2O3 enriched)
sedimentary
Diamond
Carbon (C)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (Green Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Weathered granitic rock fragment
Likely granite or granodiorite, composed mainly of quartz, feldspar, and mica
igneous
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Pumice
Pumice
igneous
Chert / Flint (or lithic artifact flake)
Microcrystalline Quartz (SiO2)
sedimentary
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
igneous
Quartzite
Quartzite (SiO2-rich metamorphic rock)
metamorphic
Turquoise bead bracelet
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Chert (variations include Flint)
Chert (SiO2)
sedimentary
Green Quartzite
Metamorphic Quartzite (often colored by chromium-bearing minerals or fuchsite)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Iron-rich quartzite or ferruginous metamorphic rock
Ferruginous quartzite, likely hematite/goethite-bearing quartzite; SiO₂ with Fe₂O₃/FeO(OH)
metamorphic
Diamond
Native Carbon (C)
gemstone
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Small rounded pebble
Indeterminate lithic grain; likely weathered sandstone, iron-stained quartz-rich rock, or a concretion
sedimentary
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Sunstone (Aventurine Feldspar)
(Ca,Na)((Al,Si)2Si2O8) with inclusions of Cu or Fe2O3
mineral
Chert (Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
mineral
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Pumice (specifically a water-worn, weathered variety)
Vesicular volcanic glass
igneous
Chert (often called Flint)
Chert (SiO2)
sedimentary