Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Category
Mineral, Specifically A Rock Fragment
Browse mineral, specifically a rock fragment specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 predominantly)
sedimentary
Weathered schist or gneiss fragment
Quartz–feldspar–mica metamorphic rock; likely mica schist or gneiss
metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
igneous
Granite (with Orthoclase and Quartz)
Phaneritic Felsic Igneous Rock (KAlSi3O8 + SiO2)
igneous
Sandstone
Sandstone (composed predominantly of SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
River cobble (Greywacke/Sandstone)
Sandstone / Greywacke
sedimentary
Sandstone (likely Conglomerate or Gritstone)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Clastic sedimentary rock (SiO2 primary)
sedimentary
K-Feldspar Granite Fragment
Felsic Plutonic Rock (Granite)
igneous
Coquina / Shelly Sandstone
Calcareous Sandstone / Coquina
sedimentary
Serpentine
Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4
metamorphic
Milky Quartz Geode or Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Likely weathered fossil bone fragment
Indeterminate fossilized bone; taxonomic identification requires microscopy and locality data
fossil
Fossiliferous Limestone (Crinoidal)
Calcite-bearing bioclastic packstone (CaCO3)
sedimentary
Pink Granite (with Potassic Feldspar and Quartz)
Felsic Intrusive Igneous Rock (Granite)
igneous
Quartz in Matrix (possibly with Biotite or Hornblende)
Quartz (Silicon Dioxide, SiO2) in Granitic Matrix
igneous
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Citrine Geode Fragment
Citrine (Silicon Dioxide with Iron Impurities), SiO2
mineral
Dalmatian Stone
Peralkaline rhyolite
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Likely quartz-bearing rock or quartz crystal fragment
Quartz, silicon dioxide (SiO₂), possibly with iron-stained matrix
mineral
Ruby in Zoisite
Anyolite
metamorphic
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Emerald in Matrix (Quartz/Schist)
Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities
mineral
Basalt with Vesicle/Vug
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Sandstone
Sandstone (composed predominantly of Quartz, SiO2)
sedimentary
Agate (or Banded Agate)
Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)
Mineral, specifically a Cryptocrystalline Quartz variety
Basalt with Amygdaloidal Inclusions
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Milky quartz (rough quartz fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Iron-stained quartz vein fragment
Quartz (SiO₂), likely with limonite/goethite iron oxides and minor sulfides
mineral
Likely weathered quartz-rich rock or mineral fragment
Indeterminate from image; possibly quartz-bearing pegmatite or iron-stained quartz
mineral
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2)
sedimentary
Sandstone Pebble
Sandstone (Silicon dioxide-rich clastic sedimentary rock)
sedimentary