Red Granite
Granite (Felsic intrusive igneous rock)
igneous
Category
Mixed (Predominantly Sedimentary And Igneous)
Browse mixed (predominantly sedimentary and igneous) specimens identified by the Rock Identifier community.
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Pink granite
Coarse-grained granitic rock, chiefly orthoclase microcline feldspar, quartz, and dark biotite/amphibole
igneous
Gabbro (Water-worn pebble)
Gabbro
igneous
Pegmatite with Lepidolite and Feldspar
Pegmatite (containing K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 and KAlSi3O8)
igneous
Quartz-rich metamorphic rock, likely mica schist
Mica schist; chiefly quartz (SiO₂) and mica, likely muscovite/biotite, with possible feldspar
metamorphic
Diorite (River Rock/Cobble)
Intermediate Plutonic Igneous Rock (Diorite)
igneous
Pink Granite
Granite (Phaneritic Acidic Igneous Rock)
igneous
Pink and Green Tourmaline (Tumbled)
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Polished quartz-rich feldspar rock, possibly orbicular granite
Granite or granitic pegmatite; chiefly quartz (SiO₂), feldspar, and dark biotite/amphibole
igneous
Conglomerate
Conglomerate (Sedimentary rock containing rounded clasts)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sodalite
Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)
mineral
Lunar Meteorite
Lunar Feldspathic Breccia
igneous
Pink Granite
Phaneritic Quartz-Feldspar Plutonic Rock
igneous
Concrete Paver (Artificial Cementitious Rock)
Hydrated Portland Cement Aggregate
Sedimentary (Synthetic)
Dalmatian Stone (often called Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock with Arfvedsonite (formerly believed to be Jasper)
igneous
Quartz and Mixed Sedimentary Rocks
Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies
sedimentary
Yellow Chalcedony (likely carnelian or yellow agate)
Silicon Dioxide (SiO₂)
mineral
Black granite (likely polished gabbro or diabase)
Granitoid rock dominated by feldspar, quartz, and dark mafic minerals; exact identification requires testing
igneous
Sodalite and Calcite
Na8(Al6Si6O24)Cl2 (Sodalite) and CaCO3 (Calcite)
mineral
Sandstone (likely Greywacke or Siltstone variety)
Arenite / Siltstone (primarily SiO2)
sedimentary
Granite Pegmatite
Pegmatite (Quartz, Feldspar, Mica)
igneous
Conglomerate (pebble-to-cobble gravel)
Polymictic conglomerate; clast-supported conglomerate in a sandy or silty matrix
sedimentary
Granite Pebble
Granite
igneous
Graphite
Graphite (Native Carbon, C)
metamorphic
Mixed River Stones and Agates
Mixed Silicates and Ironstones (primarily SiO2 and Fe2O3)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Mixed Crushed Stone
Aggregate (varied mineral composition)
igneous and sedimentary mixture
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Jasper (Green Jasper/Heliotropic Chert)
Silicon Dioxide (SiO₂)
sedimentary
Sandstone (lithic wake/graywacke variety)
Arenite/Greywacke (SiO2 with lithic fragments)
sedimentary
Gray granite or granitic gneiss gravel
Granite; primarily quartz, feldspar, and mica (exact identification is uncertain from the photograph)
igneous
Granodiorite
Granodiorite (intermediate intrusive igneous rock containing plagioclase, quartz, and K-feldspar)
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Polished granite cobble
Granite, typically quartz–feldspar–biotite granite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Granodiorite
Phaneritic-textured Intrusive Granodiorite
igneous
Fossiliferous Shale Matrix
Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments
sedimentary
Lapis Lazuli (Low-grade)
Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)
metamorphic
Hematite
Hematite (Fe2O3)
mineral
Mahogany Obsidian
Volcanic glass containing Magnetite/Hematite
igneous