Sandstone
Arenite (SiO2 primarily)
sedimentary
Category
Mineral Side Rock
Browse mineral side rock specimens identified by the Rock Identifier community.
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Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Sandstone
Arenite (SiO2 based with cement)
sedimentary
Dalmatian Jasper
Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)
igneous
Quartz Geode (partially opened)
Silicon Dioxide (SiO2) with iron staining
mineral
Gold Nugget
Native Gold (Au)
mineral
Gneiss (with Quartzite layers)
Gneissic Metamorphic Rock
metamorphic
Sandstone with Manganese Dendrites/Oxide coatings
Arenite with Pyrolusite and Romanechite (MnO2)
sedimentary
Red Sandstone
Sandstone (mainly SiO2 with Iron Oxide cement)
sedimentary
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
igneous
Granite
Granite (a common type of Felsic Intrusive Igneous Rock)
Igneous Rock
Plume Agate
Silicon Dioxide (SiO2)
mineral
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3/FeO(OH))
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite
Granite
Igneous
River Rock
Sedimentary Rock (various compositions)
sedimentary
Greywacke (River Pebble with Quartz Veins)
Greywacke (Indurated Sandstone); Veins: SiO2 (Quartz)
sedimentary
Banded Agate with Drusy Quartz
Cryptocrystalline Quartz (SiO2) with macrocrystalline Quartz
mineral
Granite Pegmatite with Muscovite Mica
Granite Pegmatite (Silicon Dioxide and complex silicates)
igneous
Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
Limestone with Quartz or Calcite Veining
Calcium Carbonate (CaCO3) matrix with SiO2 or CaCO3 inclusions
sedimentary
Epidote with Quartz/Feldspar
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) with associated minerals in a host rock
Mineral/Metamorphic rock
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone (likely Calcareous or Quartz-rich)
Arenite (SiO2 based typically)
sedimentary
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Mineral structure/Rock
Basalt
Mafic Igneous Rock (composed primarily of pyroxene and calcium-rich plagioclase)
igneous
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
sedimentary
Jasper (Green Jasper/Heliotrope variety)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Sandstone (likely Siltstone)
Arenite or Siltstone (high SiO2 content)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2)
mineral