Quartzite Cobble
Metamorphosed Quartz Sandstone (primarily SiO2)
metamorphic
Category
Sedimentary (Chemically Precipitated Mineral)
Browse sedimentary (chemically precipitated mineral) specimens identified by the Rock Identifier community.
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with iron oxide and other mineral impurities
sedimentary (chemical/biological origin)
Rock Salt / Halite Crust
Halite (Sodium Chloride, NaCl)
sedimentary
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)
metamorphic
Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)
Porphyritic Basalt (Mafic Extrusive)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
igneous
Amphibolite with Hornblende
Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Feldspar Rich Granite with Limonite Staining
K-Feldspar Granite (KAlSi3O8)
igneous
Basalt with Iron Oxidation
Mafic Igneous Rock (Basalt)
igneous
Granite (Weathered/Oxidized)
Phaneritic Felsic Igneous Rock (composed of Quartz, Orthoclase Feldspar, and Mica)
igneous
Blue Agate (Dyed)
Silicon Dioxide (SiO2)
Sedimentary (formed from silica deposits)
Diamond (in jewelry setting)
Adamantine Carbon (C)
mineral
Gold
Native Gold (Au)
mineral
Gold
Native Gold (Au)
mineral
Banded Agate (Tumbled)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Himalayan Salt (Halite)
Halite (NaCl) with trace minerals
mineral
Amber
Succinite (specifically for Baltic amber); chemical formula approximately C10H16O
Mineraloid
Dyed Agate Geode (Pink/Magenta)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite
Metamorphic rock
Native Gold Nugget
Native Gold (Au)
mineral
Gold Nuggest
Native Gold (Au)
mineral
Ruby (in costume jewelry context)
Corundum (Al2O3) with Chromium impurities
mineral
Gold Ore / Native Gold
Native Gold (Au)
mineral
Blue Goldstone
Goldstone (artificial glass)
Mineral (man-made glass, not natural)
Basalt with Weathering Crust
Extrusive mafic volcanic rock
igneous
Basalt with Iron Oxidation (Lattice/Veined)
Mafic Volcanic Rock (principally Plagioclase and Pyroxene)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Magnetite
Magnetite (Fe3O4)
mineral
Granite Cobble
Granite (Felsic Plutonic Rock)
igneous
Basalt (River Cobble)
Basalt (Mafic volcanic rock)
igneous
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Orbicular Granite
Orbicular Granitoid
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Agate
Banded Chalcedony (SiO2)
mineral
Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Red Jasper
Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite (Beach Pebble)
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert Pebble / Brachiopod Fossil Internal Mold
Silicon Dioxide (SiO2) / Fossil: Brachiopoda (generic internal mold)
sedimentary
Blue Quartz (Dumortierite Quartz)
Silicon Dioxide with Aluminum Borosilicate (SiO2 + AlAl6BSi3O18)
metamorphic