Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Category
Sedimentary Or Igneous
Browse sedimentary or igneous specimens identified by the Rock Identifier community.
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Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Sapphire
Corundum (Al2O3)
mineral
Pumice
Pumice (volcanic rock)
Igneous
Rose Quartz
Silicon Dioxide (SiO2) with traces of Titanium, Iron, or Manganese
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian and Green Calcite
Volcanic Glass and Calcium Carbonate (CaCO3)
igneous and sedimentary/mineral
Laterite
Laterite (no specific mineral formula as it's a rock type)
Sedimentary
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Green Calcite
Calcite (CaCO3)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Granite
Granite (Phaneritic Igneous Rock)
igneous
Quartz (River Pebble)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Peridot and Citrine Gemstones (in a ring setting)
Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)
mineral
Magnetite
Magnetite (Fe3O4)
Mineral
Calcite
Calcite (CaCO3)
mineral
Granodiorite River Pebble
Granodiorite
igneous
Quartz (likely milky/gray variety)
Quartz (SiO₂)
Mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Jasper in Basalt Matrix
Silicon Dioxide (SiO2) with impurities; Chalcedony
sedimentary (secondary mineral) within igneous
Quartz
Silicon Dioxide (SiO2)
Mineral
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite - Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)
mineral
Granite
Granite (compositionally: Quartz, Alkali Feldspar, and Plagioclase)
igneous
Chalcedony (Banded/Mottled Variety)
Chalcedony (a cryptocrystalline variety of Quartz, SiO2)
Mineral
Muscovite Mica
Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary occurrence
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Mineral
Mica (likely Muscovite)
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Garnetiferous Pegmatite
Pegmatite with Almandine Garnet and Muscovite
igneous
Clear Quartz (Rock Crystal)
Quartz (SiO₂)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Quartz (Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz
Quartz (SiO₂)
Mineral
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Wishing Stone (Basalt or Chert with Quartz Veins)
Basalt or microcrystalline Quartz (Chert) with localized hydrothermal Quartz (SiO2) veining
igneous or sedimentary
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary