Quartz (likely Clear Quartz or Rock Crystal)
Quartz (SiO2)
Mineral
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
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Garnet Beads
Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)
Mineral
Dalmatian Stone (Dalmatian Jasper)
Dalmatian Stone (A variety of Perthite / Aplite)
Igneous
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Biotite (Black Mica)
Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)
mineral
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Pink Feldspar
Potassium Feldspar (KAlSi3O8)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Granite
Phaneritic plutonic rock (SiO2 rich)
igneous
Andesite Porphyry
Andesite (extrusive volcanic rock)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Tiger's Eye
Silicon Dioxide with Crocidolite (SiO2)
mineral
Mixed Tumbled Gemstones and River Rocks
Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)
Mixed (Igneous, Sedimentary, Metamorphic, and Minerals)
Granite
Granite (Silica-rich Plutonic Rock)
igneous
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
sedimentary
Granodiorite (or Granite) Pebble
Phaneritic Felsic Igneous Pebble
igneous
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Agate
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic extrusive volcanic rock (composed primarily of Plagioclase feldspar and Pyroxene)
igneous
Desert Rose (Baryte or Selenite variant)
Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions
mineral
Shale with Plant Fossils / Carbonaceous Shale
Laminated Mudrock (Siliciclastic)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Greenschist
Greenschist (Chlorite Schist)
metamorphic
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
mineral
Chalk / Sedimentary Limestone
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Granite
Plutonic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Blue Tiger's Eye
Crocidolite in Quartz (altered)
Mineral
Diamond (or Cubic Zirconia simulant)
Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ
mineral
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Schist (Kyanite Schist)
Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)
metamorphic
Greenshist / Chlorite Schist
Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive volcanic rock)
igneous
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2
mineral
Rhodonite
Rhodonite (MnSiO3)
mineral
Kaolinite (Kaolin)
Kaolinite (Al2Si2O5(OH)4)
mineral
Aventurine Quartz
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
mineral
Muscovite Mica
Muscovite: KAl2(AlSi3O10)(OH)2
mineral
Granite
Granite (phaneritic felsic intrusive rock)
igneous
Lapis Lazuli
Lapis lazuli (complex rock composed of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)
metamorphic