Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
sedimentary
Category
Synthetic (Man Made Glass)
Browse synthetic (man made glass) specimens identified by the Rock Identifier community.
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Diamond
Native Carbon (C)
mineral
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
igneous
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Lava Rock (Dyed)
Basalt / Volcanic scoria
igneous
Chert (Flint variety)
Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2
sedimentary
Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Engineered Quartz (Quartzite look-alike)
Silicon Dioxide (SiO2) composite
mineral-based composite
Coquina
Biogenic Limestone (Coquina)
sedimentary
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Synthetic Zinc/Polycarbonate Composite (Bey-specimen)
Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay
Anthropogenic Mineral Mimic
Belemnoit (Fossil)
Belemnoidea (Order), Rostrum / Guard
sedimentary
Granite
Phaneritic Plutonic Felsic Rock
igneous
Granite
Granite (Phaneritic igneous rock)
igneous
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Diamond
Cubic carbon (C)
mineral
Tumbled brown chalcedony (likely jasper or agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining
mineral
Slate
Metamorphic Pelitic Rock
metamorphic
Diamond
Carbon (C)
mineral
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Granodiorite
Intrusive Igneous Rock
igneous
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
igneous
Diamond
Diamond (pure carbon C)
mineral
Diamond
Carbon (C)
mineral
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite
mineral
Granodiorite / Granite (Weathered)
Granodiorite
Igneous
Diamond (Heart Cut)
Carbon (C)
gemstone
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Polished black stone egg, probably black obsidian
Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
sedimentary