Chert (Basanite variety)
Microcrystalline Quartz (SiO2)
sedimentary
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.
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (SiO2 with accessory minerals)
sedimentary
Pink Granite
Phaneritic Plutonic Felsic Rock (rich in Potassium Feldspar)
igneous
Granodiorite
Phaneritic Granodiorite
igneous
Coquina
Biogenic Limestone (mostly Calcium Carbonate, CaCO3)
sedimentary
Epidote (likely Pistacite in Epidosite rock)
Epidote: Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Basalt
Basalt
igneous
Citrine Geode Fragment
Citrine (Silicon Dioxide with Iron Impurities), SiO2
mineral
Sandstone (likely with Quartz Veining)
Arenite (primarily SiO2)
sedimentary
Talc (Soapstone variety)
Talc (Hydrated magnesium silicate) - Mg3Si4O10(OH)2
mineral
Sandstone (Greywacke/Siltstone variant)
Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)
sedimentary
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Granitic Pegmatite (Muscovite and Quartz)
Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Petrified Wood
Silicon Dioxide (SiO2) permineralized organic matter
sedimentary
Slag
Glassy silicate byproduct (anthropogenic material)
industrial byproduct
Quartzite
Quartzite (primarily SiO2)
metamorphic
Banded Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)
sedimentary
Porphyritic Basalt (Peanut Obsidian/Star Galaxy-style)
Porphyritic Basalt (Silica-rich Volcanic Rock)
igneous
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)
sedimentary
River Cobble (likely Basalt or Metagraywacke)
Non-specific water-worn lithic fragment
igneous or metamorphic
River Stone (Quartzite)
Metamorphosed Sandstone (SiO2)
metamorphic
Mica-rich Pegmatite
Pegmatite (rich in Muscovite and Biotite)
igneous
Ferrous Slag
Iron/Steel Slag (Complex Calcium-Alumino-Silicates)
Anthropgenic (Industrial Byproduct)
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
igneous
River Rock (likely Siltstone or fine-grained Sandstone)
Clastic Sedimentary Rock
sedimentary
Garden Quartz
Included Quartz (SiO2 with accessory minerals such as Chlorite, Hematite, or Feldspar)
mineral
Pink Quartzite
Quartzite (SiO2)
metamorphic
Green Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Blue Quartzite (River Pebble)
Quartzite (primarily SiO2 with Dumortierite or Crocidolite inclusions)
metamorphic
Serpentine
Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Ruby
Corundum (Al₂O₃) with Chromium (Cr)
Mineral (gemstone)
Basalt
Basalt (dominated by Plagioclase Feldspar and Pyroxene)
igneous
Basalt with Olivine Phenocrysts
Porphyritic Basalt (with (Mg, Fe)2SiO4)
igneous
Granite (White Granite variant)
Phaneritic Plutonic Rock (High-silica Felsic)
igneous