Red Garnet
Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)
Mineral
Category
Rock (Likely Sedimentary)
Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Basalt River Cobble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Andesite
Andesite (Intermediate Extrusive Igneous Rock)
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Fossiliferous Limestone
Calcareous biomicrite / Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Yellow Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO₂)
mineral
Chalcedony (Commonly known as Carnelian or Agate pebble)
Microcrystalline Quartz (SiO2)
mineral
André Landed Here Rock (Glacial Erratic)
Granodiorite / Diorite (compositional estimate)
igneous
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
Quartzite
Silicon Dioxide (SiO2)
metamorphic
Chert (Jasper-rich)
Microcrystalline/Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Limonitic Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 dominant staining)
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxide (Limonite/Hematite) coating
sedimentary
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic intrusive igneous rock (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartz (Milky/Iron-stained)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Quartz (Common Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite (or Ferruginous Quartzite)
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 impurities)
metamorphic
Porphyritic Andesite
Andesite
igneous
Jasper
Silicon dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Dalmatian Jasper / Dalmatian Stone
Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)
igneous
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
organic mineraloid
Fossilized Shell in Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Quartz (Druzy) in host rock
SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)
Mineral
Chert (specifically Jasper/Flint pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Slag (Industrial Glass/Metal Waste)
Artificial silicate/ferro-silicate byproduct
Mineraloid (Industrial byproduct)
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Felsic Igneous Rock (likely Rhyolite or weathered Granite)
Felsic Volcanic/Plutonic Rock
igneous
Jasper or Chert with Quartz Vugs
Silicon Dioxide (SiO2)
sedimentary