Chalcedony (Agate/Jasper mix in host rock)
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
mineral
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Pegmatite (Granitic)
Granitic Pegmatite
igneous
Pegmatite (Granitic)
Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Native Copper in Basalt
Cu-element in Mafic Volcanic Rock (Basalt)
igneous
Gray Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz Pebble (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Aragonite Star Cluster (or Aragonite Sputnik)
Aragonite (Orthorhombic Calcium Carbonate, CaCO3)
mineral
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Smurf Rock (Fictional Interpretation)
Cyanus Anthropomorphicus (Geologic Simulation)
Artificial/Fantasy Object
Shiva Lingam
Cryptocrystalline Quartz (Jasproid/Jasper)
sedimentary
Slag (Anthropogenic Glass/Iron byproduct)
Ferro-silicate Slag
Anthropogenic (Man-made)
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Cubic Zirconia
Zirconium dioxide (ZrO2)
mineral
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
White Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Limestone (specifically Crushed Limestone/Calcictic)
Calcium Carbonate (CaCO3)
sedimentary
Asphalt (Bituminous Concrete)
Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)
not a rock (anthropogenic material/technofossil)
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Pumice
Pumice (a vesicular volcanic glass)
igneous
Scoria
Scoria (vesicular volcanic rock)
igneous
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
metamorphic
Ruby (Raw Corundum)
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Kimberlite with Diamond
Kimberlite (Diamond formula: C)
igneous
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Red Garnet (likely Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Piddock-bored Mudstone
Lutite (Siltstone or Mudstone) with Pholad borings
sedimentary
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)
metamorphic
Slag Glass
Amorphous Silicate (Man-made)
industrial byproduct
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Synthetic Faux Fur Fursuit
Polyacrylonitrile / Polyester (Synthetic Textile)
not a rock (synthetic material/costume)
Granite Pegmatite with Muscovite Mica
Granite Pegmatite (Silicon Dioxide and complex silicates)
igneous
Vesicular Basalt or Scoria
Basalt (extrusive volcanic rock)
igneous
Diamond (in jewelry setting)
Cubic Carbon (C)
mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Agate Slices and Clear Quartz Points
Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)
mineral