Magnetite (Lodestone variety)
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Category
Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)
Browse mineral like byproduct (often mistaken for igneous rock or meteorite) specimens identified by the Rock Identifier community.
Corundum (Ruby/Sapphire crystal)
Al2O3 (Aluminum Oxide)
mineral
Pink Calcite (Mangano Calcite)
Calcium Carbonate (CaCO3)
mineral
Sandstone (likely Iron-rich or Arkosic)
Arenite (SiO2 with FeO(OH) or Fe2O3 staining)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Quartz
Quartz (SiO2)
Mineral
Jasper with Agate Inclusions
Jasper (Silicon Dioxide, SiO2) with Chalcedony/Agate
sedimentary
Calcite
Calcite (CaCO3)
Mineral
Greenstone
Greenschist (commonly containing Chlorite, Actinolite, and Epidote)
metamorphic
Granite
Felsic Plutonic Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Jasper and Basalt Mix (Dark Chert/Basalt River Pebble)
Silicon Dioxide (SiO2) or Mafic extrusive igneous rock
sedimentary or igneous
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Quartz Druse (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
mineral
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone with Quartz Veins
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Sandstone (likely a river or beach pebble)
Sandstone (a clastic sedimentary rock)
Sedimentary Rock
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic glass containing Spherulite inclusions (primarily Cristobalite, SiO2)
igneous
Sandstone (Quartzite Pebble)
Arenite / Metamorphosed Sandstone (SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)
sedimentary
Smoky Quartz with Calcite/Quartz Veining
Silicon Dioxide (SiO2)
mineral
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist
metamorphic
River Jasper (Chert/Chalcedony mix)
Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions
sedimentary
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Pink Granite
Granite (Phaneritic Felsic Igneous Rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist (Quartz-Muscovite-Biotite Schist)
metamorphic
Vesicular Basalt (Iron-rich)
Scoriaceous Basalt / Oxidized Vesicular Basalt
igneous
Rose Quartz with Schist Matrix
Silicon Dioxide (SiO2) with Mica-Schist
mineral
Sandstone (likely Greywacke or Siltstone variety)
Arenite / Siltstone (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Agate
Agate (Microcrystalline Quartz, SiO2)
mineral
Wonderstone
Rhyolite (Silicon Dioxide with Iron Oxide impurities)
igneous
Yellow Quartzite Pebble
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Smoky Quartz (Tumbled)
Smoky Quartz (SiO2 - Silicon Dioxide)
mineral