Granite
Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O
Category
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
Granite
Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O
Jasper-bearing Quartzite River Cobble
Tectonized Quartzite with Iron-Oxide (Hematite/Limonite) Veining
White Quartz
Quartz (Silicon Dioxide, SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Jasper (Picture Jasper variety)
Silicon Dioxide (SiO2) with impurities
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
Granite
Phaneritic Felsic Igneous Rock
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
Sandstone
Arenite (SiO2 based typically)
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
Sandstone
Arenite
Sandstone
Arenite (Siliclastic sedimentary rock)
Sandstone (Quartzose Sandstone)
Sandstone (SiO2 with various trace minerals)
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
Sandstone Pebbles
Arenite (primarily SiO2 with mineral cement)
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Sandstone
Arenite (SiO2 primarily)
Shale
Laminated Mudstone
Granite Gravel / Crushed Granite
Plutonic Felsic Igneous Rock
Banded calcite (travertine/cave calcite)
Calcite, CaCO₃; likely banded carbonate travertine or flowstone
Rose Quartz
Silicon Dioxide (SiO2) with trace elements of titanium, iron, or manganese
Pyrite
Iron Disulfide (FeS2)
Tumbled blue-gray chalcedony (likely blue agate)
Chalcedony, microcrystalline quartz (SiO₂)
Granite
Granite
Fossil Coral
Scleractinia (Fossilized Hexacoral)
Sandstone
Arenite (SiO2 primarily)
Green Sandstone (Glauconitic Sandstone)
Glauconitic Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
Sandstone (likely with Borings or Vesicular Basalt)
Clastic Sedimentary Rock (Sandstone)
Pyrite
Iron Sulfide (FeS2)
Red Sandstone
Quartzose Sandstone (primarily quartz grains cemented by iron oxides)
Sandstone (Quartzose)
Arenite (SiO2 based)
Sandstone (Quartz-rich)
Arenite (Quartz Arenite)
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
Sandstone
Arenite (primarily SiO2)
Greenstone
Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote
Blue Quartzite (Aventurine variety)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite