Quartzite
Quartzite (SiO2)
metamorphic
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
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Small white mineral fragment
Indeterminate; possibly quartz, calcite, or feldspar
mineral
Likely weathered quartz-bearing rock fragment
Indeterminate; appears to contain quartz (SiO₂) with iron-oxide staining, possibly from quartzite, granite, or pegmatite
mineral
Quartz (likely Rose or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Coarse-grained Granite or Gneiss
Granitic intrusive rock
igneous
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Weathered volcanic rock, likely basalt
Basalt; commonly composed of plagioclase, pyroxene, and iron-rich oxides
igneous
Dark gray igneous rock, likely basalt
Basalt; fine-grained plagioclase–pyroxene rock, commonly with minor olivine and magnetite
igneous
Green Aventurine and Clear Quartz
Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)
Mineral
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2(SiO3)6) with chromium/vanadium traces
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with trace Fe2+)
Mineral
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Garnet Schist or Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Garnetiferous Granite
Garnet-bearing leucogranite
igneous
Quartzite
Metamorphosed Sandstone (SiO2)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Small dark volcanic rock, likely basalt
Basalt; chiefly plagioclase feldspar, clinopyroxene, and minor olivine or iron-titanium oxides
igneous
Quartz (possibly milky quartz)
Quartz (Silica; SiO₂)
Mineral
Chalcedony (Common Agate pebble)
Silicon Dioxide (SiO2)
mineral
Pyrite-bearing rock (iron pyrite)
Pyrite, FeS₂, likely disseminated or massive in a host rock
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Feldspathic Granite (likely Syenite or Granite Pegmatite)
Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)
igneous
Gray Limestone
Carbonate rock (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
River Pebble (Granite/Gneiss)
Granitic Pebble (Quartz, Feldspar, Mica composition)
igneous
Pyrite
Iron Disulfide (FeS2)
mineral
Granite Pebble
Granite
igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Mineral
Vesicular Basalt (Lava Rock)
Basalt (Vesicular Variety)
igneous
Pink Sapphire
Corundum (Al2O3 with trace Chromium and Iron)
mineral
Quartz-bearing rock fragment
Likely quartz (SiO₂) with iron-oxide staining and possible host-rock grains
mineral
Granite Sand and Gravel Mix
Phaneritic Felsic Igneous Plutonic Assemblage
igneous
Quartzite (Water-worn Cobble)
Quartzite (Composition: 90%+ SiO2)
metamorphic
Coarse-grained granite or granitic gneiss
Granite; primarily quartz (SiO₂), feldspar, and mica, possibly metamorphosed to gneiss
igneous
Granite
Phaneritic plutonic igneous rock (typically 20% to 60% quartz by volume)
igneous
Soapstone
Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)
metamorphic
Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Intrusive Igneous Rock (Granitic)
igneous