River Pebble (likely Quartzite or Siltstone)
Sedimentary Clast (SiO2 based)
sedimentary
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Fossilized Rugose Coral
Order Rugosa
fossil
Gravel or Pebble
Clastic Sedimentary Grain (typically composed of Quartz or Silicate minerals)
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Dinosaur Bone (Gembone)
Agatized Dinosaur Bone (Silicified Paleo-osteoid)
metamorphic
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt or Andesite containing plagioclase feldspar phenocrysts
igneous
Chert (Jasper/Common Opal mix)
Microcrystalline Quartz (SiO2)
sedimentary
Black Jasper (Black Stone / River Pebble)
Silicon Dioxide (SiO₂), Opaque variety of Chalcedony
sedimentary
Travertine
Terrestrial Sedimentary Rock (CaCO3)
sedimentary
Iron Slag
Ferrous Slag (complex silicate and oxide byproduct)
industrial byproduct (anthropogenic)
Diamond
Carbon (C)
mineral
Bloodstone (also known as Heliotrope)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Red Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert (variations include Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone Cobble
Arenite (Secondary classification based on grain size)
sedimentary
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Copper
Native Copper (Cu)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O
mineral
Blue Aventurine
Silicon Dioxide (SiO2) with inclusions of Dumortierite
Mineral (silicate variety)
Chert (Jasper)
Microcrystalline quartz (SiO2)
sedimentary
Slickenside
Tectonic Fault Scarp Surface
metamorphic
Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
Gold Ore / Native Gold
Native Gold (Au)
mineral
Gold
Native Gold (Au)
mineral
Gold
Gold (Au)
mineral
Sandstone (likely Graywacke or Lithic Sandstone)
Arenite / Wacke (SiO2 based with lithic fragments)
sedimentary
Bauxite
Alumina-rich rock (consisting of Gibbsite, Boehmite, and Diaspore)
sedimentary
Fossilized Shark Tooth (Scapanorhynchus)
Scapanorhynchus texanus
fossil
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Iron-Nickel Meteorite
Siderite (Meteoric Iron-Nickel alloy)
igneous
Iron Meteorite
Siderite (Meteoric Iron-Nickel alloy)
igneous
Granite
Phaneritic Granitoid
igneous
Native Copper
Native Copper (Cu)
mineral
Fossilized Coral (Favosites)
Favosites goldfussi
fossil
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Crinoid Stem Fragment
Crinoid (Class Crinoidea)
fossil
Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
metamorphic
Limestone (specifically Dolomitic Limestone)
Calcium Magnesium Carbonate (CaMg(CO3)2)
sedimentary