Banded Agate (specifically Sardonyx or Red Agate)
Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct (Anthropogenic Rock)
Browse industrial byproduct (anthropogenic rock) specimens identified by the Rock Identifier community.
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Diamond (Colorless/White)
Carbon (C)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Green Kyanite
Kyanite (Al2SiO5)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2 with iron impurities)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Orange Calcite (Polished Sphere)
Calcium Carbonate (CaCO3)
mineral
Smoky Quartz
Smoky Quartz (SiO2 - Silicon Dioxide with trace impurities of aluminum)
mineral
Quartzite (River Cobble)
Quartzite (primarily SiO2)
metamorphic
Copper Nugget
Native Copper (Cu)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Unakite
Epidotized Granite
metamorphic
River Rock
Sedimentary Rock (various compositions)
sedimentary
Blue Lace Agate
Chalcedony (SiO2) with trace inclusions
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Geode (Unopened)
Siliceous Concretion / Geode
sedimentary
Basalt Pebble
Basalt
igneous
Granite Cobble
Granite (Phaneritic Igneous Rock)
igneous
Quartzite (River Stone)
Quartzite
metamorphic
Pumice
Pumice (Felsic volcanic rock)
igneous
Quartz Vein in River Siltstone
Crystalline Quartz (SiO2) in Siliclastic Matrix
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite (with iron oxide cement)
sedimentary
Porphyry
Porphyritic Igneous Rock
igneous
Gneiss
Foliated Metamorphic Rock
metamorphic
Granite Pebble
Felsic Plutonic Rock
igneous
Coal (Bituminous)
Sedimentary carbonaceous rock
sedimentary
Greenstone
Protolith: Basaltic rock
metamorphic
Basalt
Basaltic Mafic Rock
igneous
River Pebble (Greywacke or Siltstone)
Clastic Sedimentary Rock
sedimentary
Gneiss
Foliated Metamorphic Rock
metamorphic
Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Hag Stone
Perforated Sedimentary Rock
sedimentary
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic