Sandstone (with cross-bedding)
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Category
Industrial By Product
Browse industrial by product specimens identified by the Rock Identifier community.
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Olivine (Peridotite/Dunite)
Olivine (Mg,Fe)2SiO4 within Peridotite
igneous
Yellow Calcite
Calcium Carbonate (CaCO3)
Mineral
Agate (Chert/Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Diamond
Diamond (pure Carbon, C)
mineral
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Matrix
igneous/metamorphic
Basalt
Basalt (SiO2 percentage between 45% and 52%)
igneous
Diamond
Native Carbon (C)
mineral
Copper Nugget
Native Copper (Cu)
mineral
Anthracite Coal
Anthracite
metamorphic
Quartzite (River Cobble)
Quartzite (SiO2 silicon dioxide)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Chalcedony (Agate/Carnelian)
Cryptocrystalline Quartz (SiO2)
mineral
Diamond (Cluster Ring)
Carbon (C)
mineral
Ruby
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz with Iron Staining)
Silicon Dioxide (SiO2)
mineral
Anthracite
Anthracite (Carbon)
metamorphic
Diamond
Diamond (pure carbon C)
mineral
Diamond
Diamond (C)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Rough Aquamarine
Beryl (Be₃Al₂Si₆O‑₁₈)
mineral
Diamond
C (Carbon)
mineral
Opalite
Synthetic Fluorescent Glass (SiO2 + impurities)
mineraloid (synthetic)
Milky Quartz Pebble with Inclusions
Crystalline Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) on Sedimentary Host Rock
mineral
Chert (Nodule)
Chert (Silica, SiO2)
sedimentary
Quartzite (River Stone)
Quartzite (SiO2)
metamorphic
Rough Blue Sapphire
Corundum (Al2O3)
mineral
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Sunstone-like Chalcedony)
Silicon Dioxide (SiO2)
mineral
Red Jasper
Chalcedony/Quartz (SiO2) with iron inclusions
mineral
Fairy Stone (Staurolite Concretion)
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Limestone or Chalk
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic