Agate Slices and Clear Quartz Points
Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)
mineral
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
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Ruby
Corundum (mineral species), variety: Ruby (Al2O3 with Cr3+ as the chromophore)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Siltstone or Fine-grained Sandstone pebble
Siltstone (primarily SiO2 with clay minerals)
sedimentary
Vanadinite
Vanadinite (Pb5(VO4)3Cl)
mineral
Yellow Agate
Agate (Varietal form of Chalcedony/Quartz, SiO2)
mineral
Andesite
Intermediate Volcanic Rock (Andesite)
igneous
Portable Ceramic Space Heater
Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements
not a rock (synthetic/industrial object)
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartz (SiO2)
metamorphic
Garnet in Matrix
Almandine or Spessartine Garnet in Quartz/Schist Matrix (X3Al2(SiO4)3)
metamorphic
Coal (Anthracite or Bituminous)
Lithified plant matter (Carbon)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Blue Quartzite (River Pebble)
Quartzite (primarily SiO2 with Dumortierite or Crocidolite inclusions)
metamorphic
Pumice
Pumiceous volcanic glass
igneous
Opal
Hydrous silicon dioxide (SiO2·nH2O)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Asphalt (Road Aggregate)
Bituminous Conglomerate / Asphalt Concrete
Anthropogenic (Man-made)
Chert (Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Chert with Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Porphyritic Basalt (Peanut Obsidian/Star Galaxy-style)
Porphyritic Basalt (Silica-rich Volcanic Rock)
igneous
Banded Agate (Brazilian Agate Slice)
Chalcedony (Silicon Dioxide / SiO2)
Mineral
Diamond / Clear Quartz / Glass paste
Carbon (Diamond) / Silicon Dioxide (Quartz)
gemstone
Quartz Vein in Metamorphic Rock
Silicon Dioxide (SiO2) within Metasedimentary host
metamorphic
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Pink Quartzite
Quartzite (mainly SiO2 with iron oxide impurities)
metamorphic
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Gold-bearing Quartz
Lode Gold in Silicon Dioxide (SiO2)
mineral
Gold-bearing Quartz
Auriferous Quartz (SiO2 with native Au)
mineral
Orange Calcite with Siderite/Iron Oxide Coating
Calcium Carbonate (CaCO3)
mineral
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Stilbite
Stilbite-Ca (Hydrated calcium sodium aluminum silicate), NaCa4(Si27Al9)O72·28H2O
mineral
Bauxite
Aluminium ore consisting largely of the minerals gibbsite Al(OH)3, boehmite γ-AlO(OH) and diaspore α-AlO(OH)
sedimentary
Schist (Micaceous Schist)
Micaceous schist (Mainly Muscovite/Biotite mixed with Quartz)
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
Basalt Water-Worn Pebble
Aphanitic Mafic Igneous Rock
igneous
Jasper (Iron-stained Chalcedony)
SiO2 with Fe2O3 (Iron Oxide) impurities
Sedimentary / Mineral (Silica)
Quartzite
Quartzite (primarily SiO2)
metamorphic