Banded Iron Formation
Banded Iron Formation (BIF)
Metamorphic Rock
Category
Man Made Byproduct (Non Geological)
Browse man made byproduct (non geological) specimens identified by the Rock Identifier community.
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Pearl (Biogenic Mineraloid)
Calcium carbonate (Aragonite) and Conchiolin, CaCO3
mineral
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Chert (often called Flint for darker varieties)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Iron Slag
Anthropogenic Vitreous Ferrous Silicate
industrial byproduct (anthropogenic)
Slag
Anthropogenic Iron Silicate Glass
mineral
Quartzite (Iron-stained)
Quartzite (SiO2 with iron oxides)
metamorphic
Basalt
Basalt (extrusive igneous rock)
Igneous
Tiffany Stone
Bertrandite (with Fluorite, Opal, and Chalcedony), Be4Si2O7(OH)2
mineral
Blue Chalcedony and Picture Jasper Beads
Blue Chalcedony (SiO2), Picture Jasper (SiO2)
Mineral
Quartz (likely Milky Quartz or Chalcedony)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Jasper (yellow/cream variety)
SiO₂ (Cryptocrystalline Quartz)
Sedimentary
Diamond (Cluster Ring)
Carbon (C)
mineral
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
Rough Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Carbon (C)
mineral
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Chalcedony (Common Opal/Chert variety)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Schist
Schist (various mineral compositions)
Metamorphic
Red Jasper
Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)
Mineral
Sandstone
Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)
Sedimentary Rock
Rough Diamond
Diamond (pure Carbon, C)
mineral
Turquoise (beads)
Turquoise; CuAl6(PO4)4(OH)8·4H2O
Mineral
Ruby
Corundum (Al₂O₃) with Chromium (Cr)
Mineral (gemstone)
Ferrocoke or Slag
Anthropogenic pyrometallurgical residue
igneous
Garnet Schist
Almandine-Muscovite Schist
metamorphic
Quartz
Quartz (SiO₂)
Mineral
Wishing Stone (Gneiss or Basalt with Quartz Vein)
Gneiss or Metabasalt (with a Quartz or Calcite intrusion)
metamorphic
Fossiliferous Limestone
Calcite (CaCO3) Rich Bio-sedimentary Rock
sedimentary
Peridot and Citrine Gemstones (in a ring setting)
Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)
mineral
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Agate (translucent pebble)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz (beads)
SiO2 (Silicon Dioxide)
Mineral
Chert (Nodule)
Microcrystalline Silica (SiO2)
sedimentary
Serpentinite (Serpentine Rock)
Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.
Metamorphic
Hexagonaria (Petoskey Stone)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Red Granite
Phaneritic Felsic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Lazulite
Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2
mineral