Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
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Sandstone (Fossiliferous)
Arenite / Clastic Sedimentary Rock
sedimentary
Chrysocolla in Quartz (Quantum Quattro variant)
Hydrated copper silicates (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) often mixed with SiO2
mineral
Basalt
Aphanitic Mafic Igneous Rock
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Painted Pet Rock (Quartzite/Sandstone base)
Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
sedimentary
Quartz-rich rock, likely milky quartz
Quartz (SiO₂), possibly a massive quartz aggregate
mineral
Quartzite Pebble (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
metamorphic
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Native Copper within Host Rock
Native Copper (Cu)
Mineral
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Howlite
Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)
mineral
Tufa
Calcareous Tufa (CaCO3)
sedimentary
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Jasper
Jasper (Silica-rich microcrystalline Quartz, SiO2 with Fe2O3 impurities)
sedimentary
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Sandstone (likely Greywacke variant)
Arenite
sedimentary
Amygdaloidal Basalt
Extrusive mafic igneous rock with amygdules
igneous
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Travertine (used in construction, not a 'specimen' in situ)
Travertine
Sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Yellow Jasper
Silica (Silicon Dioxide, SiO2) with iron inclusions
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
Mineral (variety of Chalcedony/Quartz)
Red Jasper
Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Iron-stained Quartzite
Quartzite with Limonite/Hematite staining (SiO2 with FeO(OH)·nH2O)
metamorphic
River Stone (Sandstone or Siltstone)
Sedimentary Rock (Clastic)
sedimentary
Dyed Agate
Silicon Dioxide (SiO2) with synthetic dyes
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Yellow Quartz (Citrine/Lemon Quartz)
Silicon Dioxide (SiO2)
mineral
Gold Nuggests
Native Gold (Au)
mineral
Rhyolite
Rhyolite, felsic extrusive igneous rock
igneous
Sandstone (Graywacke)
Arenite / Graywacke (SiO2 with lithic fragments)
sedimentary
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
sedimentary