Dalmation Stone
Peralkaline Rock (mixed silicate minerals)
igneous
Category
Mineral (Evaporite)
Browse mineral (evaporite) specimens identified by the Rock Identifier community.
Ammonite Fossil (Polished Section)
Ammonoidea (typically mineralized with Calcite CaCO3)
sedimentary
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)
sedimentary
Granite (including Pegmatite variants)
Phaneritic Plutonic Rock (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Muscovite mica)
Igneous
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Greenschist (Greenstone River Pebble)
Greenschist (Chlorite Schist)
metamorphic
Blue Quartzite
Quartzite (specifically a variety enriched with blue-coloring minerals)
Metamorphic Rock
Sandstone
Arenite (predominantly SiO2)
sedimentary
Dinosaur Bone (Fossilized)
Permineralized Bone (CaCO3 or SiO2 after Hydroxylapatite)
sedimentary
Labradorite
Labradorite (a calcium-enriched feldspar mineral), (Ca, Na)(Al, Si)4O8
mineral
Red Garnet
Almandine and Pyrope (Silicate minerals: Fe3Al2(SiO4)3 and Mg3Al2(SiO4)3)
mineral
Nephrite (a form of Jade)
Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral
Limonite-pseudomorph after Pyrite (Prophecy Stone)
Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
Quartz with Hematite Staining
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) inclusions
mineral
Diamond
Carbon (C)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Diamond
Diamond (C)
mineral
Granite
Phaneritic Felsic Igneous Rock (Main minerals: SiO2, KAlSi3O8, NaAlSi3O8)
igneous
Green Aventurine
Aventurine (variety of Quartz - SiO2)
Mineral_Rock
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Basalt (with possible mineral veining)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
Quartzite with Iron Mineral Banding
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining
metamorphic
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Geode (Unopened)
Silica Concretion / Geode (Formula: SiO2 for quartz internal contents)
sedimentary
Green Aventurine
Quartz with Fuchsine inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Granite
Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)
Igneous
Chrysocolla
Chrysocolla, (Cu, Al)2H2Si2O5(OH)4·nH2O
mineral
Granite Cobble
Granite
igneous
Tumbled Moonstone
Feldspar (Orthoclase/Albite), KAlSi3O8
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Basalt with Quartz/Feldspar Vein
Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Amethyst (Polished/Carved Crystal)
Silicon Dioxide (SiO2) with trace Iron (Fe)
mineral