Turquoise
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Category
Antropogenic (Man Made Material)
Browse antropogenic (man made material) specimens identified by the Rock Identifier community.
Quartz (variety of colors)
SiO2 (Silicon Dioxide)
Mineral
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Petrified Wood
Silicified wood, primarily composed of Quartz (SiO2)
Mineral, often found in sedimentary deposits
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Granite (likely a river or beach pebble)
Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)
Igneous
Chert
Chert (variant of microcrystalline quartz)
Sedimentary
Iron Meteorite
Iron-nickel alloy (e.g., Kamacite, Taenite)
Meteorite (extraterrestrial material)
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
Mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Mineral
Serpentinite
Serpentinite
metamorphic
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Clear Quartz (Rock Crystal)
Quartz (SiO₂)
Mineral
Iron Meteorite
Iron-Nickel Meteorite (primarily composed of kamacite and taenite alloys)
Mineral
Citrine
Quartz (SiO2) - variety Citrine
Mineral
Coquina
Coquina (a type of limestone)
Sedimentary
Jasper and Aquamarine (likely)
Jasper (Cryptocrystalline Quartz (SiO2)), Aquamarine (Beryl (Be3Al2Si6O18))
Sedimentary (Jasper), Mineral (Aquamarine)
Citrine Quartz
Citrine (Silicon Dioxide - SiO2)
Mineral
Jasper
Silicon Dioxide (SiO2) - a variety of Chalcedony (Cryptocrystalline Quartz)
Mineral
Travertine (used in construction, not a 'specimen' in situ)
Travertine
Sedimentary
Rose Quartz
Quartz (SiO₂), specifically a variety of Quartz
Mineral
Basalt
Basalt
igneous
Quartz (pebble)
Quartz (SiO₂)
Mineral
Agate
Agate (Cryptocrystalline Variety of Quartz, SiO2)
Mineral
Chert (or Flint)
Chert (microcrystalline or cryptocrystalline quartz, SiO2)
Sedimentary
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Granite
Granite (Felsic intrusive igneous rock)
igneous
Chert or Flint (polished/water-worn)
Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.
Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Mookaite Jasper
Siliceous sedimentary rock (variety of Jasper/Chert)
Sedimentary Rock
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz (possibly milky quartz or quartz with inclusions)
SiO2 (Silicon Dioxide)
Mineral
Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Sedimentary
Peridot (likely, given the color and bead form)
Olivine, variety Peridot (Mg,Fe)2SiO4
Mineral
Clear Quartz (or Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Mineral, potentially a rock with chalcedony/jasper.
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Calcite
Calcite (CaCO3)
Mineral