Granite
Granite (Felsic Plutonic Rock)
igneous
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
Learn about Mineral (Man Made Glass, Not Natural) in the encyclopedia
View all →
Quartzite Pebble
Metamorphic Quartz-rich Rock
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Chert (Green Fossilized Algae or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Sedimentary Rock
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Yellow Quartz Pebble (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Diamond
Diamond (pure carbon, C)
mineral
Diamond (Princess Cut Faceted Gemstone)
Native Carbon (C)
mineral
Limonite / Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Amethyst Beads
Quartz (Silicon Dioxide, SiO2 with iron impurities)
gemstone
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Limonite Concretion / Ironstone
Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O
mineral
Black Sand (Magnetite Sand)
Magnetite (Fe3O4)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Phaneritic Felsic Igneous Rock
igneous
Chert or heavily weathered flint
Microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Limonite with Hematite
Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3/FeO(OH)) inclusions
mineral
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Tumbled orange chalcedony (likely carnelian)
Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian
mineral
Citrine Quartz
Silicon dioxide (SiO2)
mineral
Likely weathered metallic mineral or slag fragment
Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag
mineral
Likely weathered river pebble
Indeterminate lithology; possibly fine-grained sandstone, siltstone, or chert
sedimentary
Chert (specifically Black Chert or Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Rough Diamond
Natural Diamond (Carbon, C)
mineral
Sandstone
Clastic sedimentary rock (quartz arenite)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Polished agate/chalcedony fragment
Microcrystalline quartz (SiO₂), likely banded chalcedony or agate
gemstone
Sandstone
Arenite
sedimentary
Raw Sapphire (Corundum)
Aluminum oxide (Al2O3)
gemstone
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (SiO2 dominant)
sedimentary
Sandstone (Pebble)
Sandstone
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Flint
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Moqui Marble
Hematite-Goethite Concretion
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Gold-bearing Quartz
Native Gold (Au) in Quartz (SiO2) matrix
mineral