Quartzite
Quartzite (primarily SiO2)
metamorphic
Category
Not A Rock (Man Made Industrial Metal)
Browse not a rock (man made industrial metal) specimens identified by the Rock Identifier community.
Quartzite River Stone
Quartzite (SiO2)
metamorphic
Piddock-bored Mudstone
Lutite (Siltstone or Mudstone) with Pholad borings
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite with inclusions
Metamorphic Rock (Mainly SiO2)
metamorphic
River Pebble (Basalt)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Granite
Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (containing Pyroxene, Plagioclase feldspar, and Olivine)
igneous
Chert (often called Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
Jasper (Iron-stained Chalcedony)
SiO2 with Fe2O3 (Iron Oxide) impurities
Sedimentary / Mineral (Silica)
Vesicular Basalt
Extrusive mafic igneous rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Iron Slag
Ferrous Slag (complex silicate and oxide byproduct)
industrial byproduct (anthropogenic)
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Pink Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Extrusive Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
Druzzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Obsidian
Obsidian (volcanic glass)
Igneous
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Yellow Quartzite (River Pebble)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Banded Agate
Chalcedony / Silicon Dioxide (SiO2)
mineral
Marble
Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)
metamorphic
Quartzite with Iron Mineral Banding
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining
metamorphic
Sea Glass (Cobalt Blue)
Amorphous Silica (Glass with Cobalt additives)
Anthropogenic specimen (man-made)
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Basalt
Basalt (Volcanic Mafic Rock)
igneous
Grey Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
Olivine Peridotite
Peridotite (comprising Olivine (Mg,Fe)2SiO4 and Pyroxene)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Wishing Stone (Basalt/Greywacke with Quartz Vein)
Basalt or Siltstone with SiO2 (Quartz) hydrothermal intrusion
igneous/sedimentary
Basalt
Basalt
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Granitoid (Granitic Rock)
Granitoid (Quartzo-feldspathic plutonic rock)
igneous
Mica Schist
Foliated Metamorphic Rock (Schist)
metamorphic
Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Marble
Recrystallized Calcite (CaCO3) Rock
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic